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Add darker axis lines at X=0, Y=0 origin #95

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Add darker axis lines at X=0, Y=0 origin #95

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fa91fec
Initial plan
Copilot Nov 4, 2025
b1df224
Add darker axis lines at X=0 and Y=0
Copilot Nov 4, 2025
ba68e0f
Fix boundary checks for axis line rendering
Copilot Nov 4, 2025
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28 changes: 28 additions & 0 deletions src/app/components/CanvasGrid.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@ import { ColorPalette } from '../constants/colors';

const CELL_STROKE_COLOR = '#777';
const CELL_STROKE_WIDTH = 0.5;
const AXIS_STROKE_COLOR = '#333';
const AXIS_STROKE_WIDTH = 2;
const DISPLAY_SIZE = 800; // Fixed canvas size in pixels

function getCoordinate(rowIndex: number, cellSize: number) {
Expand Down Expand Up @@ -62,6 +64,32 @@ function CanvasGrid({ onMouseOver, grid, cellSize, offsetX = 0, offsetY = 0, pal
ctx.strokeRect(x, y, cellSize, cellSize);
}
}

// Draw darker axis lines at X=0 and Y=0
// Calculate grid indices for world coordinates (0, 0)
const xAxisGridIndex = calculatedGridSize / 2 - offsetX;
const yAxisGridIndex = calculatedGridSize / 2 - 1 - offsetY;

ctx.strokeStyle = AXIS_STROKE_COLOR;
ctx.lineWidth = AXIS_STROKE_WIDTH;

// Draw Y-axis (vertical line at X=0 in world coordinates)
if (xAxisGridIndex >= 0 && xAxisGridIndex < calculatedGridSize) {
const xPos = getCoordinate(xAxisGridIndex, cellSize);
ctx.beginPath();
ctx.moveTo(xPos, 0);
ctx.lineTo(xPos, canvasHeight);
ctx.stroke();
}

// Draw X-axis (horizontal line at Y=0 in world coordinates)
if (yAxisGridIndex >= 0 && yAxisGridIndex < calculatedGridSize) {
const yPos = getCoordinate(yAxisGridIndex, cellSize);
ctx.beginPath();
ctx.moveTo(0, yPos);
ctx.lineTo(canvasWidth, yPos);
ctx.stroke();
}
}, [grid, calculatedGridSize, cellSize, canvasWidth, canvasHeight, offsetX, offsetY, palette]);

return (
Expand Down