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Javascript optimizations, refactor

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This commit is contained in:
Tyler Hallada 2014-07-19 15:49:07 -04:00
parent c3bcdbfa23
commit 2fa00b2929
2 changed files with 68 additions and 57 deletions
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2
_layouts/home.html
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@ -24,7 +24,7 @@
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,400italics,300,300italics,200' rel='stylesheet' type='text/css'>
<!-- Scripts -->
<script src="js/magic.js"></script>
<script async src="js/magic.js"></script>
</head>
<body>
<canvas id="magic"></canvas>

121
js/magic.js
View File

@ -66,9 +66,68 @@ window.onload = function () {
"b": Math.floor(Math.random() * (255 + 1))};
}
function drawSplineSegment(branch, t, context) {
var ax = (-branch.points[0].x + 3*branch.points[1].x - 3*branch.points[2].x + branch.points[3].x) / 6;
var ay = (-branch.points[0].y + 3*branch.points[1].y - 3*branch.points[2].y + branch.points[3].y) / 6;
var bx = (branch.points[0].x - 2*branch.points[1].x + branch.points[2].x) / 2;
var by = (branch.points[0].y - 2*branch.points[1].y + branch.points[2].y) / 2;
var cx = (-branch.points[0].x + branch.points[2].x) / 2;
var cy = (-branch.points[0].y + branch.points[2].y) / 2;
var dx = (branch.points[0].x + 4*branch.points[1].x + branch.points[2].x) / 6;
var dy = (branch.points[0].y + 4*branch.points[1].y + branch.points[2].y) / 6;
context.moveTo(
ax*Math.pow(t, 3) + bx*Math.pow(t, 2) + cx*t + dx,
ay*Math.pow(t, 3) + by*Math.pow(t, 2) + cy*t + dy
);
context.lineTo(
ax*Math.pow(t+0.2, 3) + bx*Math.pow(t+0.2, 2) + cx*(t+0.2) + dx,
ay*Math.pow(t+0.2, 3) + by*Math.pow(t+0.2, 2) + cy*(t+0.2) + dy
);
}
function splitBranch(branch, new_branches) {
// Replace with 2 new branches
for (var k = 0; k < 2; k++) {
// Generate random deviation from previous angle
var angle = branch.angle - (Math.random() * 180 - 90);
// Generate random length
var length = Math.random() * 15 + 4;
// Calculate new point
var x2 = branch.points[3].x + Math.sin(Math.PI * angle / 180) * length;
var y2 = branch.points[3].y - Math.cos(Math.PI * angle / 180) * length;
// Add to new branch array
new_branches.push({
points:new Array(
branch.points[1],
branch.points[2],
branch.points[3],
{x:x2, y:y2}
),
angle:angle,
});
}
}
function createNewBranches(branches) {
// Create array to store next iteration of branchces
var new_branches = [];
// Iterate over each branch
for (var j in branches) {
splitBranch(branches[j], new_branches);
}
return new_branches;
}
/* Most of this funtion is provided by Maissan Inc. in their tutorial:
http://www.maissan.net/articles/simulating-vines */
function drawTendrils(context, x, y, interations, sort, prune, prune_to) {
function drawTendrils(context, x, y, iterations, sort, prune, prune_to) {
// Set stroke colour
context.lineWidth = 0.5;
@ -96,30 +155,13 @@ window.onload = function () {
gradient = newColor.gradient;
context.strokeStyle = "rgb(" + color.r + "," + color.g + "," + color.b + ")";
context.beginPath();
// Draw branches
for (var i in branches) {
// Draw spline segment
var ax = (-branches[i].points[0].x + 3*branches[i].points[1].x - 3*branches[i].points[2].x + branches[i].points[3].x) / 6;
var ay = (-branches[i].points[0].y + 3*branches[i].points[1].y - 3*branches[i].points[2].y + branches[i].points[3].y) / 6;
var bx = (branches[i].points[0].x - 2*branches[i].points[1].x + branches[i].points[2].x) / 2;
var by = (branches[i].points[0].y - 2*branches[i].points[1].y + branches[i].points[2].y) / 2;
var cx = (-branches[i].points[0].x + branches[i].points[2].x) / 2;
var cy = (-branches[i].points[0].y + branches[i].points[2].y) / 2;
var dx = (branches[i].points[0].x + 4*branches[i].points[1].x + branches[i].points[2].x) / 6;
var dy = (branches[i].points[0].y + 4*branches[i].points[1].y + branches[i].points[2].y) / 6;
context.beginPath();
context.moveTo(
ax*Math.pow(t, 3) + bx*Math.pow(t, 2) + cx*t + dx,
ay*Math.pow(t, 3) + by*Math.pow(t, 2) + cy*t + dy
);
context.lineTo(
ax*Math.pow(t+0.2, 3) + bx*Math.pow(t+0.2, 2) + cx*(t+0.2) + dx,
ay*Math.pow(t+0.2, 3) + by*Math.pow(t+0.2, 2) + cy*(t+0.2) + dy
);
drawSplineSegment(branches[i], t, context);
}
context.stroke();
context.closePath();
}
// Advance t
t += 0.2;
@ -127,38 +169,7 @@ window.onload = function () {
// When finished drawing splines, create a new set of branches
if (t >= 1) {
// Create array to store next iteration of branchces
var new_branches = [];
// Iterate over each branch
for (var j in branches) {
// Replace with 2 new branches
for (var k = 0; k < 2; k++) {
// Generate random deviation from previous angle
var angle = branches[j].angle - (Math.random() * 180 - 90);
// Generate random length
var length = Math.random() * 15 + 4;
// Calculate new point
var x2 = branches[j].points[3].x + Math.sin(Math.PI * angle / 180) * length;
var y2 = branches[j].points[3].y - Math.cos(Math.PI * angle / 180) * length;
// Add to new branch array
new_branches.push({
points:new Array(
branches[j].points[1],
branches[j].points[2],
branches[j].points[3],
{x:x2, y:y2}
),
angle:angle,
});
}
}
var new_branches = createNewBranches(branches);
// If over 10 branches, prune the branches
if (prune) {
@ -179,8 +190,8 @@ window.onload = function () {
}
// Count interations
interations--;
if (interations < 0) clearInterval(interval);
iterations--;
if (iterations < 0) clearInterval(interval);
}, 32);