54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
import Vector from './vector.mjs';
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const boidShape = [
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new Vector(1, 0),
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new Vector(-.5, .5),
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new Vector(-.5, -.5),
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new Vector(1, 0),
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];
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const boidShapeSize = boidShape.length;
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const transformed = new Vector(0, 0);
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export const fill = (activeBoids, params, ctx, width, height, center) =>
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{
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const boidsSize = activeBoids.length;
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ctx.clearRect(0, 0, width, height);
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// Draw each boid’s head following the angle of its course
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ctx.beginPath();
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ctx.fillStyle = 'black';
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for (let i = 0; i < boidsSize; ++i)
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{
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const boid = activeBoids[i];
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const angle = boid.vel.angle();
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let isFirst = true;
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for (let j = 0; j < boidShapeSize; ++j)
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{
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transformed.x = boidShape[j].x;
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transformed.y = boidShape[j].y;
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transformed
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.rotate(angle)
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.mul(params.radius)
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.add(center)
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.add(boid.pos);
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if (isFirst)
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{
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ctx.moveTo(transformed.x, transformed.y);
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isFirst = false;
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}
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else
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{
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ctx.lineTo(transformed.x, transformed.y);
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}
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}
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}
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ctx.fill();
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};
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