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firstMat.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
html, body {
margin:0;
padding: 0;
}
</style>
<script type="text/javascript" src="./gl-matrix.js"></script>
</head>
<body>
<canvas id="canvas" width="500px" height="500px" style="border:1px solid #ccc"></canvas>
</body>
<script type="text/javascript">
var el = document.getElementById('canvas');
var ctx = el.getContext('2d');
var model = [
1, 1, -1,
-1, 1, -1,
-1, -1, -1,
1, -1, -1,
1, 1, 1,
-1, 1, 1,
-1, -1, 1,
1, -1, 1
];
var indexes = [
0, 3, 2,
0, 2, 1, //뒤
0, 1, 5,
0, 5, 4, //위
0, 4, 7,
0, 7, 3, //오
6, 5, 1,
6, 1, 2, //왼
6, 4, 5,
6, 7, 4, //앞
6, 7, 3,
6, 3, 2 //밑
];
var fl = 250;
var degree = 0;
var mvp = mat4.fromValues(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
function getMat(degree) {
//s, r, t, p
var out = mat4.create();
var rad = Math.PI/180*degree;
var s = Math.sin(rad);
var c = Math.cos(rad);
console.log(degree, s,c)
var ry = mat4.fromValues(
c, 0, -s, 0, //x
0, 1, 0, 0, //y
s, 0, c, 0, //z
0, 0, 0, 1);
var rx = mat4.fromValues(
1, 0, 0, 0, //x
0, c, -s, 0, //y
0, s, c, 0, //z
0, 0, 0, 1);
var t = mat4.fromValues(
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, -10, 1);
var p = mat4.fromValues(
fl, 0, 0, 0,
0, fl, 0, 0,
0, 0, -1, 0,
0, 0, 0, 1);
mat4.multiply(out, ry, rx);
mat4.multiply(out, t, out);
mat4.multiply(out, p, out);
return out;
}
function render(startDegree, once) {
if (startDegree) {
degree = startDegree;
}
mvp = getMat(degree);
ctx.clearRect(0, 0, el.width, el.height);
for (var i = 0; i < model.length/3; i++) {
var out = vec4.create();
var point = vec4.fromValues(model[i * 3], model[i * 3 + 1], model[i * 3 + 2], 1);
mat4.multiply(out, mvp, point);
var z = out[2];
var w = out[3];
var x = out[0]/z/w + el.width/2;
var y = out[1]/z/w + el.height/2;
// console.log(out, ' |', x, y, z);
ctx.beginPath();
ctx.arc(x, y, 1, 0, 2*Math.PI, true);
ctx.fill();
}
ctx.beginPath();
ctx.moveTo(0,0);
for (var i = 0; i < indexes.length/3; i++) {
var p1 = 3*indexes[i * 3];
var p2 = 3*indexes[i * 3 + 1];
var p3 = 3*indexes[i * 3 + 2];
var triangle = [
model[p1], model[p1 + 1], model[p1 + 2],
model[p2], model[p2 + 1], model[p2 + 2],
model[p3], model[p3 + 1], model[p3 + 2]
];
var startX, startY;
console.log(p1, p2, p3)
console.log(triangle);
for (var j = 0; j < 3; j++) {
var out = vec4.create();
var point = vec4.fromValues(triangle[j * 3], triangle[j * 3 + 1], triangle[j * 3 + 2], 1);
mat4.multiply(out, mvp, point);
var z = out[2];
var w = out[3];
var x = out[0]/z/w + el.width/2;
var y = out[1]/z/w + el.height/2;
if (j === 0) {
ctx.beginPath();
ctx.moveTo(x, y);
startX = x;
startY = y;
} else if (j === 2) {
ctx.lineTo(x, y);
ctx.lineTo(startX, startY);
} else {
ctx.lineTo(x, y);
}
ctx.stroke();
}
}
once || requestAnimationFrame(render);
degree += 1;
degree %= 360;
}
render(0, 1);
// render();
document.addEventListener('keydown', function(e){
if (e.which === 13) {
render(degree += 1, 1);
}
});
</script>
</html>