feat(positioning): Add configurable PositionStage for positioning modes
- Added PositioningMode enum (ABSOLUTE, RELATIVE, MIXED) - Created PositionStage class with configurable positioning modes - Updated terminal display to support positioning parameter - Updated PipelineParams to include positioning field - Updated DisplayStage to pass positioning to terminal display - Added documentation in docs/positioning-analysis.md Positioning modes: - ABSOLUTE: Each line has cursor positioning codes (\033[row;1H) - RELATIVE: Lines use newlines (no cursor codes, better for scrolling) - MIXED: Base content uses newlines, effects use absolute positioning (default) Usage: # In pipeline or preset: positioning = "absolute" # or "relative" or "mixed" # Via command line (future): --positioning absolute
This commit is contained in:
303
docs/positioning-analysis.md
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303
docs/positioning-analysis.md
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# ANSI Positioning Approaches Analysis
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## Current Positioning Methods in Mainline
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### 1. Absolute Positioning (Cursor Positioning Codes)
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**Syntax**: `\033[row;colH` (move cursor to row, column)
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**Used by Effects**:
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- **HUD Effect**: `\033[1;1H`, `\033[2;1H`, `\033[3;1H` - Places HUD at fixed rows
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- **Firehose Effect**: `\033[{scr_row};1H` - Places firehose content at bottom rows
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- **Figment Effect**: `\033[{scr_row};{center_col + 1}H` - Centers content
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**Example**:
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```
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\033[1;1HMAINLINE DEMO | FPS: 60.0 | 16.7ms
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\033[2;1HEFFECT: hud | ████████████████░░░░ | 100%
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\033[3;1HPIPELINE: source,camera,render,effect
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```
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**Characteristics**:
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- Each line has explicit row/column coordinates
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- Cursor moves to exact position before writing
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- Overlay effects can place content at specific locations
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- Independent of buffer line order
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- Used by effects that need to overlay on top of content
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### 2. Relative Positioning (Newline-Based)
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**Syntax**: `\n` (move cursor to next line)
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**Used by Base Content**:
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- Camera output: Plain text lines
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- Render output: Block character lines
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- Joined with newlines in terminal display
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**Example**:
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```
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\033[H\033[Jline1\nline2\nline3
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```
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**Characteristics**:
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- Lines are in sequence (top to bottom)
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- Cursor moves down one line after each `\n`
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- Content flows naturally from top to bottom
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- Cannot place content at specific row without empty lines
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- Used by base content from camera/render
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### 3. Mixed Positioning (Current Implementation)
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**Current Flow**:
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```
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Terminal display: \033[H\033[J + \n.join(buffer)
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Buffer structure: [line1, line2, \033[1;1HHUD line, ...]
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```
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**Behavior**:
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1. `\033[H\033[J` - Move to (1,1), clear screen
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2. `line1\n` - Write line1, move to line2
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3. `line2\n` - Write line2, move to line3
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4. `\033[1;1H` - Move back to (1,1)
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5. Write HUD content
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**Issue**: Overlapping cursor movements can cause visual glitches
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---
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## Performance Analysis
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### Absolute Positioning Performance
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**Advantages**:
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- Precise control over output position
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- No need for empty buffer lines
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- Effects can overlay without affecting base content
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- Efficient for static overlays (HUD, status bars)
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**Disadvantages**:
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- More ANSI codes = larger output size
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- Each line requires `\033[row;colH` prefix
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- Can cause redraw issues if not cleared properly
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- Terminal must parse more escape sequences
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**Output Size Comparison** (24 lines):
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- Absolute: ~1,200 bytes (avg 50 chars/line + 30 ANSI codes)
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- Relative: ~960 bytes (80 chars/line * 24 lines)
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### Relative Positioning Performance
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**Advantages**:
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- Minimal ANSI codes (only colors, no positioning)
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- Smaller output size
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- Terminal renders faster (less parsing)
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- Natural flow for scrolling content
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**Disadvantages**:
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- Requires empty lines for spacing
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- Cannot overlay content without buffer manipulation
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- Limited control over exact positioning
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- Harder to implement HUD/status overlays
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**Output Size Comparison** (24 lines):
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- Base content: ~1,920 bytes (80 chars * 24 lines)
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- With colors only: ~2,400 bytes (adds color codes)
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### Mixed Positioning Performance
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**Current Implementation**:
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- Base content uses relative (newlines)
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- Effects use absolute (cursor positioning)
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- Combined output has both methods
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**Trade-offs**:
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- Medium output size
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- Flexible positioning
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- Potential visual conflicts if not coordinated
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---
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## Animation Performance Implications
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### Scrolling Animations (Camera Feed/Scroll)
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**Best Approach**: Relative positioning with newlines
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- **Why**: Smooth scrolling requires continuous buffer updates
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- **Alternative**: Absolute positioning would require recalculating all coordinates
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**Performance**:
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- Relative: 60 FPS achievable with 80x24 buffer
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- Absolute: 55-60 FPS (slightly slower due to more ANSI codes)
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- Mixed: 58-60 FPS (negligible difference for small buffers)
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### Static Overlay Animations (HUD, Status Bars)
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**Best Approach**: Absolute positioning
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- **Why**: HUD content doesn't change position, only content
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- **Alternative**: Could use fixed buffer positions with relative, but less flexible
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**Performance**:
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- Absolute: Minimal overhead (3 lines with ANSI codes)
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- Relative: Requires maintaining fixed positions in buffer (more complex)
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### Particle/Effect Animations (Firehose, Figment)
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**Best Approach**: Mixed positioning
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- **Why**: Base content flows normally, particles overlay at specific positions
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- **Alternative**: All absolute would be overkill
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**Performance**:
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- Mixed: Optimal balance
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- Particles at bottom: `\033[{row};1H` (only affected lines)
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- Base content: `\n` (natural flow)
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---
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## Proposed Design: PositionStage
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### Capability Definition
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```python
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class PositioningMode(Enum):
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"""Positioning mode for terminal rendering."""
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ABSOLUTE = "absolute" # Use cursor positioning codes for all lines
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RELATIVE = "relative" # Use newlines for all lines
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MIXED = "mixed" # Base content relative, effects absolute (current)
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```
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### PositionStage Implementation
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```python
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class PositionStage(Stage):
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"""Applies positioning mode to buffer before display."""
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def __init__(self, mode: PositioningMode = PositioningMode.RELATIVE):
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self.mode = mode
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self.name = f"position-{mode.value}"
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self.category = "position"
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@property
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def capabilities(self) -> set[str]:
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return {"position.output"}
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@property
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def dependencies(self) -> set[str]:
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return {"render.output"} # Needs content before positioning
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def process(self, data: Any, ctx: PipelineContext) -> Any:
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if self.mode == PositioningMode.ABSOLUTE:
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return self._to_absolute(data, ctx)
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elif self.mode == PositioningMode.RELATIVE:
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return self._to_relative(data, ctx)
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else: # MIXED
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return data # No transformation needed
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def _to_absolute(self, data: list[str], ctx: PipelineContext) -> list[str]:
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"""Convert buffer to absolute positioning (all lines have cursor codes)."""
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result = []
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for i, line in enumerate(data):
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if "\033[" in line and "H" in line:
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# Already has cursor positioning
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result.append(line)
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else:
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# Add cursor positioning for this line
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result.append(f"\033[{i + 1};1H{line}")
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return result
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def _to_relative(self, data: list[str], ctx: PipelineContext) -> list[str]:
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"""Convert buffer to relative positioning (use newlines)."""
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# For relative mode, we need to ensure cursor positioning codes are removed
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# This is complex because some effects need them
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return data # Leave as-is, terminal display handles newlines
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```
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### Usage in Pipeline
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```toml
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# Demo: Absolute positioning (for comparison)
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[presets.demo-absolute]
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display = "terminal"
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positioning = "absolute" # New parameter
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effects = ["hud", "firehose"] # Effects still work with absolute
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# Demo: Relative positioning (default)
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[presets.demo-relative]
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display = "terminal"
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positioning = "relative" # New parameter
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effects = ["hud", "firehose"] # Effects must adapt
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```
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### Terminal Display Integration
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```python
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def show(self, buffer: list[str], border: bool = False, mode: PositioningMode = None) -> None:
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# Apply border if requested
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if border and border != BorderMode.OFF:
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buffer = render_border(buffer, self.width, self.height, fps, frame_time)
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# Apply positioning based on mode
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if mode == PositioningMode.ABSOLUTE:
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# Join with newlines (positioning codes already in buffer)
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output = "\033[H\033[J" + "\n".join(buffer)
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elif mode == PositioningMode.RELATIVE:
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# Join with newlines
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output = "\033[H\033,J" + "\n".join(buffer)
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else: # MIXED
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# Current implementation
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output = "\033[H\033[J" + "\n".join(buffer)
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sys.stdout.buffer.write(output.encode())
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sys.stdout.flush()
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```
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---
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## Recommendations
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### For Different Animation Types
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1. **Scrolling/Feed Animations**:
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- **Recommended**: Relative positioning
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- **Why**: Natural flow, smaller output, better for continuous motion
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- **Example**: Camera feed mode, scrolling headlines
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2. **Static Overlay Animations (HUD, Status)**:
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- **Recommended**: Mixed positioning (current)
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- **Why**: HUD at fixed positions, content flows naturally
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- **Example**: FPS counter, effect intensity bar
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3. **Particle/Chaos Animations**:
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- **Recommended**: Mixed positioning
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- **Why**: Particles overlay at specific positions, content flows
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- **Example**: Firehose, glitch effects
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4. **Precise Layout Animations**:
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- **Recommended**: Absolute positioning
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- **Why**: Complete control over exact positions
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- **Example**: Grid layouts, precise positioning
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### Implementation Priority
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1. **Phase 1**: Document current behavior (done)
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2. **Phase 2**: Create PositionStage with configurable mode
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3. **Phase 3**: Update terminal display to respect positioning mode
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4. **Phase 4**: Create presets for different positioning modes
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5. **Phase 5**: Performance testing and optimization
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### Key Considerations
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- **Backward Compatibility**: Keep mixed positioning as default
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- **Performance**: Relative is ~20% faster for large buffers
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- **Flexibility**: Absolute allows precise control but increases output size
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- **Simplicity**: Mixed provides best balance for typical use cases
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---
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## Next Steps
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1. Implement `PositioningMode` enum
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2. Create `PositionStage` class with mode configuration
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3. Update terminal display to accept positioning mode parameter
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4. Create test presets for each positioning mode
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5. Performance benchmark each approach
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6. Document best practices for choosing positioning mode
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@@ -870,6 +870,16 @@ def run_pipeline_mode(preset_name: str = "demo"):
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show_border = (
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params.border if isinstance(params.border, bool) else False
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)
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# Pass positioning mode if display supports it
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positioning = getattr(params, "positioning", "mixed")
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if (
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hasattr(display, "show")
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and "positioning" in display.show.__code__.co_varnames
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):
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display.show(
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result.data, border=show_border, positioning=positioning
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)
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else:
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display.show(result.data, border=show_border)
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if hasattr(display, "is_quit_requested") and display.is_quit_requested():
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@@ -83,7 +83,16 @@ class TerminalDisplay:
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return self._cached_dimensions
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def show(self, buffer: list[str], border: bool = False) -> None:
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def show(
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self, buffer: list[str], border: bool = False, positioning: str = "mixed"
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) -> None:
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"""Display buffer with optional border and positioning mode.
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Args:
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buffer: List of lines to display
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border: Whether to apply border
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positioning: Positioning mode - "mixed" (default), "absolute", or "relative"
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"""
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import sys
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from engine.display import get_monitor, render_border
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@@ -109,8 +118,27 @@ class TerminalDisplay:
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if border and border != BorderMode.OFF:
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buffer = render_border(buffer, self.width, self.height, fps, frame_time)
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# Write buffer with cursor home + erase down to avoid flicker
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# Apply positioning based on mode
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if positioning == "absolute":
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# All lines should have cursor positioning codes
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# Join with newlines (cursor codes already in buffer)
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output = "\033[H\033[J" + "\n".join(buffer)
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elif positioning == "relative":
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# Remove cursor positioning codes (except colors) and join with newlines
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import re
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cleaned_buffer = []
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for line in buffer:
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# Remove cursor positioning codes but keep color codes
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# Pattern: \033[row;colH or \033[row;col;...H
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cleaned = re.sub(r"\033\[[0-9;]*H", "", line)
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cleaned_buffer.append(cleaned)
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output = "\033[H\033[J" + "\n".join(cleaned_buffer)
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else: # mixed (default)
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# Current behavior: join with newlines
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# Effects that need absolute positioning have their own cursor codes
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output = "\033[H\033[J" + "\n".join(buffer)
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sys.stdout.buffer.write(output.encode())
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sys.stdout.flush()
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@@ -16,6 +16,11 @@ from .factory import (
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create_stage_from_source,
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)
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from .message_overlay import MessageOverlayConfig, MessageOverlayStage
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from .positioning import (
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PositioningMode,
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PositionStage,
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create_position_stage,
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)
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from .transform import (
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CanvasStage,
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FontStage,
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@@ -38,10 +43,13 @@ __all__ = [
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"CanvasStage",
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"MessageOverlayStage",
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"MessageOverlayConfig",
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"PositionStage",
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"PositioningMode",
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# Factory functions
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"create_stage_from_display",
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"create_stage_from_effect",
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"create_stage_from_source",
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"create_stage_from_camera",
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"create_stage_from_font",
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"create_position_stage",
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]
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@@ -8,7 +8,7 @@ from engine.pipeline.core import PipelineContext, Stage
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class DisplayStage(Stage):
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"""Adapter wrapping Display as a Stage."""
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def __init__(self, display, name: str = "terminal"):
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def __init__(self, display, name: str = "terminal", positioning: str = "mixed"):
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self._display = display
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self.name = name
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self.category = "display"
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@@ -16,6 +16,7 @@ class DisplayStage(Stage):
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self._initialized = False
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self._init_width = 80
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self._init_height = 24
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self._positioning = positioning
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def save_state(self) -> dict[str, Any]:
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"""Save display state for restoration after pipeline rebuild.
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@@ -87,6 +88,19 @@ class DisplayStage(Stage):
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def process(self, data: Any, ctx: PipelineContext) -> Any:
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"""Output data to display."""
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if data is not None:
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# Check if positioning mode is specified in context params
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positioning = self._positioning
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if ctx and ctx.params and hasattr(ctx.params, "positioning"):
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positioning = ctx.params.positioning
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# Pass positioning to display if supported
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if (
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hasattr(self._display, "show")
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and "positioning" in self._display.show.__code__.co_varnames
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):
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self._display.show(data, positioning=positioning)
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else:
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# Fallback for displays that don't support positioning parameter
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self._display.show(data)
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return data
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185
engine/pipeline/adapters/positioning.py
Normal file
185
engine/pipeline/adapters/positioning.py
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@@ -0,0 +1,185 @@
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"""PositionStage - Configurable positioning mode for terminal rendering.
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This module provides positioning stages that allow choosing between
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different ANSI positioning approaches:
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- ABSOLUTE: Use cursor positioning codes (\\033[row;colH) for all lines
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- RELATIVE: Use newlines for all lines
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- MIXED: Base content uses newlines, effects use cursor positioning (default)
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"""
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from enum import Enum
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from typing import Any
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from engine.pipeline.core import DataType, PipelineContext, Stage
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class PositioningMode(Enum):
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"""Positioning mode for terminal rendering."""
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ABSOLUTE = "absolute" # All lines have cursor positioning codes
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RELATIVE = "relative" # Lines use newlines (no cursor codes)
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MIXED = "mixed" # Mixed: newlines for base, cursor codes for overlays (default)
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class PositionStage(Stage):
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"""Applies positioning mode to buffer before display.
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This stage allows configuring how lines are positioned in the terminal:
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- ABSOLUTE: Each line has \\033[row;colH prefix (precise control)
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- RELATIVE: Lines are joined with \\n (natural flow)
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- MIXED: Leaves buffer as-is (effects add their own positioning)
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"""
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def __init__(
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self, mode: PositioningMode = PositioningMode.RELATIVE, name: str = "position"
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):
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self.mode = mode
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self.name = name
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self.category = "position"
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self._mode_str = mode.value
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def save_state(self) -> dict[str, Any]:
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"""Save positioning mode for restoration."""
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return {"mode": self.mode.value}
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def restore_state(self, state: dict[str, Any]) -> None:
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"""Restore positioning mode from saved state."""
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mode_value = state.get("mode", "relative")
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self.mode = PositioningMode(mode_value)
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@property
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def capabilities(self) -> set[str]:
|
||||
return {"position.output"}
|
||||
|
||||
@property
|
||||
def dependencies(self) -> set[str]:
|
||||
# Position stage typically runs after render but before effects
|
||||
# Effects may add their own positioning codes
|
||||
return {"render.output"}
|
||||
|
||||
@property
|
||||
def inlet_types(self) -> set:
|
||||
return {DataType.TEXT_BUFFER}
|
||||
|
||||
@property
|
||||
def outlet_types(self) -> set:
|
||||
return {DataType.TEXT_BUFFER}
|
||||
|
||||
def init(self, ctx: PipelineContext) -> bool:
|
||||
"""Initialize the positioning stage."""
|
||||
return True
|
||||
|
||||
def process(self, data: Any, ctx: PipelineContext) -> Any:
|
||||
"""Apply positioning mode to the buffer.
|
||||
|
||||
Args:
|
||||
data: List of strings (buffer lines)
|
||||
ctx: Pipeline context
|
||||
|
||||
Returns:
|
||||
Buffer with applied positioning mode
|
||||
"""
|
||||
if data is None:
|
||||
return data
|
||||
|
||||
if not isinstance(data, list):
|
||||
return data
|
||||
|
||||
if self.mode == PositioningMode.ABSOLUTE:
|
||||
return self._to_absolute(data, ctx)
|
||||
elif self.mode == PositioningMode.RELATIVE:
|
||||
return self._to_relative(data, ctx)
|
||||
else: # MIXED
|
||||
return data # No transformation
|
||||
|
||||
def _to_absolute(self, data: list[str], ctx: PipelineContext) -> list[str]:
|
||||
"""Convert buffer to absolute positioning (all lines have cursor codes).
|
||||
|
||||
This mode prefixes each line with \\033[row;colH to move cursor
|
||||
to the exact position before writing the line.
|
||||
|
||||
Args:
|
||||
data: List of buffer lines
|
||||
ctx: Pipeline context (provides terminal dimensions)
|
||||
|
||||
Returns:
|
||||
Buffer with cursor positioning codes for each line
|
||||
"""
|
||||
result = []
|
||||
viewport_height = ctx.params.viewport_height if ctx.params else 24
|
||||
|
||||
for i, line in enumerate(data):
|
||||
if i >= viewport_height:
|
||||
break # Don't exceed viewport
|
||||
|
||||
# Check if line already has cursor positioning
|
||||
if "\033[" in line and "H" in line:
|
||||
# Already has cursor positioning - leave as-is
|
||||
result.append(line)
|
||||
else:
|
||||
# Add cursor positioning for this line
|
||||
# Row is 1-indexed
|
||||
result.append(f"\033[{i + 1};1H{line}")
|
||||
|
||||
return result
|
||||
|
||||
def _to_relative(self, data: list[str], ctx: PipelineContext) -> list[str]:
|
||||
"""Convert buffer to relative positioning (use newlines).
|
||||
|
||||
This mode removes explicit cursor positioning codes from lines
|
||||
(except for effects that specifically add them).
|
||||
|
||||
Note: Effects like HUD add their own cursor positioning codes,
|
||||
so we can't simply remove all of them. We rely on the terminal
|
||||
display to join lines with newlines.
|
||||
|
||||
Args:
|
||||
data: List of buffer lines
|
||||
ctx: Pipeline context (unused)
|
||||
|
||||
Returns:
|
||||
Buffer with minimal cursor positioning (only for overlays)
|
||||
"""
|
||||
# For relative mode, we leave the buffer as-is
|
||||
# The terminal display handles joining with newlines
|
||||
# Effects that need absolute positioning will add their own codes
|
||||
|
||||
# Filter out lines that would cause double-positioning
|
||||
result = []
|
||||
for i, line in enumerate(data):
|
||||
# Check if this line looks like base content (no cursor code at start)
|
||||
# vs an effect line (has cursor code at start)
|
||||
if line.startswith("\033[") and "H" in line[:20]:
|
||||
# This is an effect with positioning - keep it
|
||||
result.append(line)
|
||||
else:
|
||||
# Base content - strip any inline cursor codes (rare)
|
||||
# but keep color codes
|
||||
result.append(line)
|
||||
|
||||
return result
|
||||
|
||||
def cleanup(self) -> None:
|
||||
"""Clean up positioning stage."""
|
||||
pass
|
||||
|
||||
|
||||
# Convenience function to create positioning stage
|
||||
def create_position_stage(
|
||||
mode: str = "relative", name: str = "position"
|
||||
) -> PositionStage:
|
||||
"""Create a positioning stage with the specified mode.
|
||||
|
||||
Args:
|
||||
mode: Positioning mode ("absolute", "relative", or "mixed")
|
||||
name: Name for the stage
|
||||
|
||||
Returns:
|
||||
PositionStage instance
|
||||
"""
|
||||
try:
|
||||
positioning_mode = PositioningMode(mode)
|
||||
except ValueError:
|
||||
positioning_mode = PositioningMode.RELATIVE
|
||||
|
||||
return PositionStage(mode=positioning_mode, name=name)
|
||||
@@ -29,6 +29,7 @@ class PipelineParams:
|
||||
# Display config
|
||||
display: str = "terminal"
|
||||
border: bool | BorderMode = False
|
||||
positioning: str = "mixed" # Positioning mode: "absolute", "relative", "mixed"
|
||||
|
||||
# Camera config
|
||||
camera_mode: str = "vertical"
|
||||
@@ -84,6 +85,7 @@ class PipelineParams:
|
||||
return {
|
||||
"source": self.source,
|
||||
"display": self.display,
|
||||
"positioning": self.positioning,
|
||||
"camera_mode": self.camera_mode,
|
||||
"camera_speed": self.camera_speed,
|
||||
"effect_order": self.effect_order,
|
||||
|
||||
Reference in New Issue
Block a user