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assignment1.js
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assignment1.js
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"use strict";
var gl;
var points;
var angle = 0;
var twist = 0;
var depth = 5;
var program;
var vertices = [];
var colors = [];
var color = "random";
var mode = "outline";
var fractal = true;
// The shape is an array of triangles.
var shape = [];
window.onload = function init() {
var canvas = document.getElementById("gl-canvas");
angle = document.getElementById("angle").value;
twist = document.getElementById("twist").value;
depth = document.getElementById("tesselation").value;
color = document.getElementById("color").value;
mode = document.getElementById("mode").value;
fractal = document.getElementById("fractal").checked;
gl = WebGLUtils.setupWebGL(canvas);
if (!gl) { alert("WebGL isn't available"); }
gl.viewport(0, 0, canvas.width, canvas.height);
var gray = 45 / 255.0;
gl.clearColor(gray, gray, gray, 1.0);
program = initShaders(gl, "vertex-shader", "fragment-shader");
gl.useProgram(program);
setShape(document.getElementById("shape").value);
};
function drawShape() {
var properties = gl.getAttribLocation(program, 'properties');
gl.vertexAttrib3f(properties, twist, angle, 0.0);
var cBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cBuffer);
gl.bufferData(gl.ARRAY_BUFFER, flatten(colors), gl.STATIC_DRAW);
var vColor = gl.getAttribLocation(program, "vColor");
gl.vertexAttribPointer(vColor, 3, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(vColor);
var vBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vBuffer);
gl.bufferData(gl.ARRAY_BUFFER, flatten(vertices), gl.STATIC_DRAW);
var vPosition = gl.getAttribLocation(program, "vPosition");
gl.vertexAttribPointer(vPosition, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(vPosition);
gl.clear(gl.COLOR_BUFFER_BIT);
if (mode === 'outline') {
gl.drawArrays(gl.LINES, 0, vertices.length);
} else {
gl.drawArrays(gl.TRIANGLES, 0, vertices.length);
}
}
function setShape(val) {
shape = [];
var cos30 = Math.cos(Math.PI / 6);
if (val === 'triangle') {
shape.push([vec2(- cos30, - 0.5), vec2(0, 1), vec2(cos30, - 0.5)]);
} else if (val === 'diamond') {
var width = 0.5;
var height = 2 * width * cos30;
shape.push([vec2(- width, 0), vec2(0, height), vec2(width, 0)]);
shape.push([vec2(- width, 0), vec2(0, - height), vec2(width, 0)]);
} else if (val === 'square') {
var width = 0.5;
shape.push([vec2(-width, -width), vec2(-width, width), vec2(width, width)]);
shape.push([vec2(-width, -width), vec2(width, -width), vec2(width, width)]);
} else if (val === 'radioactive') {
var width = 0.5;
var height = 2 * width * cos30;
shape.push([vec2(- 2 * width, 0), vec2(- width, height), vec2(0, 0)]);
shape.push([vec2(width, -height), vec2(- width, - height), vec2(0, 0)]);
shape.push([vec2(2 * width, 0), vec2(width, height), vec2(0, 0)]);
} else if (val === 'star') {
var width = 0.25;
var height = 2 * width * cos30;
// Outline
shape.push([vec2(- 3 * width, height), vec2(- width, height), vec2(-2 * width, 0)]);
shape.push([vec2(- width, height), vec2(0, 2 * height), vec2(width, height)]);
shape.push([vec2(width, height), vec2(3 * width, height), vec2(2 * width, 0)]);
shape.push([vec2(- 3 * width, - height), vec2(- width, - height), vec2(- 2 * width, 0)]);
shape.push([vec2(- width, - height), vec2(0, -2 * height), vec2(width, - height)]);
shape.push([vec2(width, - height), vec2(3 * width, - height), vec2(2 * width, 0)]);
// Hexagon in the center
shape.push([vec2(- 2 * width, 0), vec2(- width, height), vec2(0, 0)]);
shape.push([vec2(- 2 * width, 0), vec2(- width, - height), vec2(0, 0)]);
shape.push([vec2(width, -height), vec2(- width, - height), vec2(0, 0)]);
shape.push([vec2(width, height), vec2(- width, height), vec2(0, 0)]);
shape.push([vec2(2 * width, 0), vec2(width, height), vec2(0, 0)]);
shape.push([vec2(2 * width, 0), vec2(width, - height), vec2(0, 0)]);
}
createShapes();
drawShape();
}
function setAngle(val) {
angle = (val * Math.PI * 2) / 360;
drawShape();
}
function setTwist(val) {
twist = val;
drawShape();
}
function setColor(val) {
color = val;
createShapes();
drawShape();
}
function setTesselation(val) {
depth = val;
createShapes();
drawShape();
}
function setMode(val) {
mode = val;
createShapes();
drawShape();
}
function setFractal(val) {
fractal = val;
createShapes();
drawShape();
}
function getColor() {
if (color === 'random') {
return vec3(Math.random(), Math.random(), Math.random())
} else if (color === 'red') {
return vec3(1.0, 0, 0);
} else if (color === 'green') {
return vec3(0, 1.0, 0);
} else if (color === 'blue') {
return vec3(0, 0, 1.0);
} else {
return vec3(1.0, 1.0, 1.0);
}
}
function createShapes() {
vertices = [];
colors = [];
function divideTriangles(a, b, c, depth) {
if (depth == 0) {
var color = getColor();
colors.push(color, color, color);
if (mode === 'outline') {
colors.push(color, color, color);
vertices.push(a, b, b, c, c, a);
} else {
vertices.push(a, b, c);
}
} else {
var ab = mix(a, b, 0.5);
var ac = mix(a, c, 0.5);
var bc = mix(b, c, 0.5);
divideTriangles(a, ab, ac, depth - 1);
divideTriangles(ab, b, bc, depth - 1);
if (!fractal) {
divideTriangles(ab, bc, ac, depth - 1);
}
divideTriangles(ac, bc, c, depth - 1);
}
}
for (var i = 0; i < shape.length; i++) {
var triangle = shape[i];
divideTriangles(triangle[0], triangle[1], triangle[2], depth);
};
}