Created
January 22, 2024 16:52
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Vector example from class.
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const vec2 = glMatrix.vec2; | |
window.init = (canvas) => { | |
console.log('Init()!!!!!!!!!'); | |
// TODO | |
}; | |
window.loop = (dt, canvas) => { | |
const ctx = canvas.getContext('2d'); | |
const center = vec2.fromValues( | |
canvas.width / 2, | |
canvas.height / 2, | |
); | |
ctx.moveTo(center[0], center[1]); | |
const direction = vec2.create(); | |
const rotated = vec2.create(); | |
const down = vec2.fromValues(0, -1); | |
vec2.rotate( | |
rotated, | |
down, | |
vec2.create(), | |
Math.PI / 6); | |
vec2.scale(direction, rotated, 100); | |
ctx.lineTo(center[0] + direction[0], center[1] + direction[1]); | |
ctx.stroke(); | |
}; |
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