mirror of
https://github.com/scratchfoundation/paper.js.git
synced 2025-01-01 02:38:43 -05:00
117 lines
No EOL
3.6 KiB
HTML
117 lines
No EOL
3.6 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>Example</title>
|
|
<link rel="stylesheet" href="../css/style.css">
|
|
<script type="text/javascript">var root = '../../'</script>
|
|
<script type="text/javascript" src="../../src/load.js"></script>
|
|
<script type="text/paperscript" canvas="canvas">
|
|
// Ported from original Metaball script by SATO Hiroyuki
|
|
// http://park12.wakwak.com/~shp/lc/et/en_aics_script.html
|
|
document.currentStyle = {
|
|
fillColor: 'black'
|
|
};
|
|
|
|
var handle_len_rate = 2.4,
|
|
circlePaths = [],
|
|
circlePath,
|
|
radius = 50;
|
|
circlePaths.push(new Path.Circle(document.bounds.center, 100));
|
|
function onMouseDown(event) {
|
|
circlePath = null;
|
|
for (var i = 0, l = circlePaths.length; i < l; i++) {
|
|
var path = circlePaths[i];
|
|
if (path.position.getDistance(event.point) < 50)
|
|
circlePath = path;
|
|
}
|
|
if (!circlePath) {
|
|
circlePath = new Path.Circle(event.point, 50);
|
|
circlePaths.push(circlePath);
|
|
}
|
|
generateConnections(circlePaths);
|
|
}
|
|
|
|
function onMouseDrag(event) {
|
|
circlePath.position = event.point;
|
|
generateConnections(circlePaths);
|
|
}
|
|
|
|
function generateConnections(paths) {
|
|
for (var i = 0, l = paths.length; i < l; i++) {
|
|
for (var j = i - 1; j >= 0; j--) {
|
|
var path = metaball(paths[i], paths[j], 0.5, handle_len_rate, 300);
|
|
if (path) {
|
|
path.removeOn({
|
|
drag: true,
|
|
down: true
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------
|
|
function metaball(ball1, ball2, v, handle_len_rate, maxDistance) {
|
|
var center1 = ball1.position,
|
|
center2 = ball2.position,
|
|
radius1 = ball1.bounds.width / 2,
|
|
radius2 = ball2.bounds.width / 2,
|
|
pi2 = Math.PI / 2,
|
|
d = center1.getDistance(center2),
|
|
u1, u2;
|
|
|
|
if (radius1 == 0 || radius2 == 0)
|
|
return;
|
|
|
|
if (d > maxDistance || d <= Math.abs(radius1 - radius2)) {
|
|
return;
|
|
} else if (d < radius1 + radius2) { // case circles are overlapping
|
|
u1 = Math.acos((radius1 * radius1 + d * d - radius2 * radius2) / (2 * radius1 * d));
|
|
u2 = Math.acos((radius2 * radius2 + d * d - radius1 * radius1) / (2 * radius2 * d));
|
|
} else {
|
|
u1 = 0;
|
|
u2 = 0;
|
|
}
|
|
|
|
var angle1 = (center2 - center1).getAngleInRadians(),
|
|
angle2 = Math.acos((radius1 - radius2) / d),
|
|
angle1a = angle1 + u1 + (angle2 - u1) * v,
|
|
angle1b = angle1 - u1 - (angle2 - u1) * v,
|
|
angle2a = angle1 + Math.PI - u2 - (Math.PI - u2 - angle2) * v,
|
|
angle2b = angle1 - Math.PI + u2 + (Math.PI - u2 - angle2) * v;
|
|
p1a = center1 + getVector(angle1a, radius1),
|
|
p1b = center1 + getVector(angle1b, radius1),
|
|
p2a = center2 + getVector(angle2a, radius2),
|
|
p2b = center2 + getVector(angle2b, radius2),
|
|
// define handle length by the distance between both ends of the curve to draw
|
|
d2 = Math.min(v * handle_len_rate, p1a.getDistance(p2a) / (radius1 + radius2));
|
|
|
|
d2 *= Math.min(1, d * 2 / (radius1 + radius2)); // case circles are overlapping
|
|
radius1 *= d2;
|
|
radius2 *= d2;
|
|
|
|
var path = new Path([p1a, p2a, p2b, p1b]);
|
|
path.style = ball1.style;
|
|
path.closed = true;
|
|
var segments = path.segments;
|
|
segments[0].handleOut = getVector(angle1a - pi2, radius1);
|
|
segments[1].handleIn = getVector(angle2a + pi2, radius2);
|
|
segments[2].handleOut = getVector(angle2b - pi2, radius2);
|
|
segments[3].handleIn = getVector(angle1b + pi2, radius1);
|
|
return path;
|
|
}
|
|
|
|
// ------------------------------------------------
|
|
function getVector(radians, length) {
|
|
return new Point({
|
|
// Convert radians to degrees:
|
|
angle: radians * 180 / Math.PI,
|
|
length: length
|
|
});
|
|
}
|
|
</script>
|
|
</head>
|
|
<body>
|
|
<canvas id='canvas' resize='true'></canvas>
|
|
</body> |