mirror of
https://github.com/scratchfoundation/paper.js.git
synced 2024-12-29 09:22:22 -05:00
Improve Future Splash example.
This commit is contained in:
Jonathan Puckey
parent
ee141ca98d
commit
78200e715b
1 changed files with 50 additions and 67 deletions
|
|
@ -18,120 +18,103 @@
|
|||
};
|
||||
values.invMass = 1 / values.mass;
|
||||
|
||||
var path;
|
||||
var path, springs;
|
||||
var size = view.size * [1.2, 1];
|
||||
|
||||
var Spring = Base.extend({
|
||||
initialize: function(a, b, param) {
|
||||
if (!param)
|
||||
param = {};
|
||||
this.a = a;
|
||||
this.b = b;
|
||||
this.restLength = param.restLength || 80;
|
||||
this.strength = param.strength ? param.strength : 0.55;
|
||||
this.mamb = values.invMass * values.invMass;
|
||||
},
|
||||
var Spring = function(a, b, strength, restLength) {
|
||||
this.a = a;
|
||||
this.b = b;
|
||||
this.restLength = restLength || 80;
|
||||
this.strength = strength ? strength : 0.55;
|
||||
this.mamb = values.invMass * values.invMass;
|
||||
};
|
||||
|
||||
Spring.prototype.update = function() {
|
||||
var delta = this.b - this.a;
|
||||
var dist = delta.length;
|
||||
var normDistStrength = (dist - this.restLength) /
|
||||
(dist * this.mamb) * this.strength;
|
||||
delta.y *= normDistStrength * values.invMass * 0.2;
|
||||
if (!this.a.fixed)
|
||||
this.a.y += delta.y;
|
||||
if (!this.b.fixed)
|
||||
this.b.y -= delta.y;
|
||||
};
|
||||
|
||||
update: function() {
|
||||
var delta = this.b - this.a;
|
||||
var dist = delta.length;
|
||||
var normDistStrength = (dist - this.restLength) /
|
||||
(dist * (this.mamb)) * this.strength;
|
||||
delta.y *= (normDistStrength * values.invMass) / 5;
|
||||
if (!this.a.fixed)
|
||||
this.a.y += delta.y;
|
||||
if (!this.b.fixed)
|
||||
this.b.y -= delta.y;
|
||||
}
|
||||
});
|
||||
|
||||
function createPath(strength) {
|
||||
var path = new Path({
|
||||
fillColor: 'black'
|
||||
});
|
||||
path.data = {};
|
||||
path.data.springs = [];
|
||||
segments = path.segments;
|
||||
var previous;
|
||||
springs = [];
|
||||
for (var i = 0; i <= values.amount; i++) {
|
||||
var segment = path.add(new Point(i / values.amount, 0.5) * size);
|
||||
var point = segment.point;
|
||||
if (i == 0 || i == values.amount)
|
||||
point.y += size.height;
|
||||
point.px = point.x;
|
||||
point.py = point.y;
|
||||
point.fixed = i === 0 || i == values.amount;
|
||||
if (previous) {
|
||||
var spring = new Spring(previous, point, {
|
||||
strength: strength
|
||||
});
|
||||
path.data.springs.push(spring);
|
||||
// The first two and last two points are fixed:
|
||||
point.fixed = i < 2 || i > values.amount - 2;
|
||||
if (i > 0) {
|
||||
var spring = new Spring(segment.previous.point, point, strength);
|
||||
springs.push(spring);
|
||||
}
|
||||
previous = point;
|
||||
}
|
||||
path.position.x -= size.width / 4;
|
||||
return path;
|
||||
}
|
||||
|
||||
function onResize() {
|
||||
values.count = 0;
|
||||
if (path) {
|
||||
if (path)
|
||||
path.remove();
|
||||
}
|
||||
size = view.bounds.size * [2, 1];
|
||||
path = createPath(0.1);
|
||||
}
|
||||
|
||||
function onMouseMove(event) {
|
||||
var segments = path.segments;
|
||||
var index = Math.floor((event.point.x + size.width / 4) * segments.length / size.width);
|
||||
var y = event.point.y;
|
||||
var range = size.height / 4;
|
||||
var segment = segments[index];
|
||||
var location = path.getNearestLocation(event.point);
|
||||
var segment = location.segment;
|
||||
var point = segment.point;
|
||||
var prev, next;
|
||||
if (segment.previous)
|
||||
prev = segment.previous.point;
|
||||
if (segment.next)
|
||||
next = segment.next.point;
|
||||
|
||||
if (!point.fixed && y + range > point.y && y - range < point.y) {
|
||||
if (!point.fixed && location.distance < size.height / 4) {
|
||||
var y = event.point.y;
|
||||
point.y += (y - point.y) / 6;
|
||||
if (prev && !prev.fixed) prev.y += (y - prev.y) / 12;
|
||||
if (next && !next.fixed) next.y += (y - next.y) / 12;
|
||||
if (segment.previous && !segment.previous.fixed) {
|
||||
var previous = segment.previous.point;
|
||||
previous.y += (y - previous.y) / 24;
|
||||
}
|
||||
if (segment.next && !segment.next.fixed) {
|
||||
var next = segment.next.point;
|
||||
next.y += (y - next.y) / 24;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function onFrame(event) {
|
||||
if (values.count != 0) {
|
||||
path.firstSegment.remove();
|
||||
path.lastSegment.remove();
|
||||
}
|
||||
updateWave(path);
|
||||
values.count++;
|
||||
}
|
||||
|
||||
function updateWave(path) {
|
||||
var segments = path.segments;
|
||||
var force = 1 - values.friction * values.timeStep * values.timeStep;
|
||||
for (var i = 0, l = segments.length; i < l; i++) {
|
||||
var point = segments[i].point;
|
||||
var ty = point.y;
|
||||
for (var i = 0, l = path.segments.length; i < l; i++) {
|
||||
var point = path.segments[i].point;
|
||||
var dy = (point.y - point.py) * force;
|
||||
point.y += dy;
|
||||
point.py = ty;
|
||||
point.y = Math.max(0, point.y);
|
||||
point.py = point.y;
|
||||
point.y = Math.max(point.y + dy, 0);
|
||||
}
|
||||
|
||||
for (var j = 0, l = path.data.springs.length; j < l; j++) {
|
||||
path.data.springs[j].update(true);
|
||||
for (var j = 0, l = springs.length; j < l; j++) {
|
||||
springs[j].update();
|
||||
}
|
||||
path.smooth();
|
||||
path.insert(0, new Point(0, size.height));
|
||||
path.add(new Point(size));
|
||||
}
|
||||
|
||||
function onKeyDown(event) {
|
||||
if (event.key == 'space')
|
||||
if (event.key == 'space') {
|
||||
path.fullySelected = !path.fullySelected;
|
||||
path.fillColor = path.fullySelected ? null : 'black';
|
||||
}
|
||||
}
|
||||
</script>
|
||||
</head>
|
||||
|
|
|
|||
Loading…
Reference in a new issue