phyks/timeline.js
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Rounded curve

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Phyks 2014-03-28 15:00:01 +01:00
parent bc3910c612
commit 756f430c44
1 changed files with 85 additions and 21 deletions
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timeline.js
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@ -155,19 +155,77 @@ SVG.addPoints = function (data) {
}
}
SVG.getControlPoints = function (data) {
// http://www.particleincell.com/wp-content/uploads/2012/06/bezier-spline.js
p1 = new Array();
p2 = new Array();
n = data.length - 1;
/*rhs vector*/
a = new Array();
b = new Array();
c = new Array();
r = new Array();
/*left most segment*/
a[0] = 0;
b[0] = 2;
c[0] = 1;
r[0] = data[0] + 2*data[1];
/*internal segments*/
for (i = 1; i < n - 1; i++) {
a[i] = 1;
b[i] = 4;
c[i] = 1;
r[i] = 4 * data[i] + 2 * data[i+1];
}
/*right segment*/
a[n-1] = 2;
b[n-1] = 7;
c[n-1] = 0;
r[n-1] = 8*data[n-1] + data[n];
/*solves Ax=b with the Thomas algorithm (from Wikipedia)*/
for (i = 1; i < n; i++) {
m = a[i]/b[i-1];
b[i] = b[i] - m * c[i - 1];
r[i] = r[i] - m*r[i-1];
}
p1[n-1] = r[n-1]/b[n-1];
for (i = n - 2; i >= 0; --i) {
p1[i] = (r[i] - c[i] * p1[i+1]) / b[i];
}
/*we have p1, now compute p2*/
for (i=0;i<n-1;i++) {
p2[i] = 2*data[i+1] - p1[i+1];
}
p2[n-1] = 0.5*(data[n] + p1[n-1]);
return {p1:p1, p2:p2};
}
SVG.draw = function() {
var points = [];
var scale = SVG.scale(SVG.raw_points);
var x = new Array();
var y = new Array();
var circle = false;
var line = false;
var point = false;
/* Draw points */
for(point in SVG.raw_points) {
x = SVG.newCoordinates(SVG.raw_points[point][0], scale.minX, scale.maxX, SVG.marginLeft, SVG.holder.parentElement.offsetWidth - SVG.marginRight);
y = SVG.newCoordinates(SVG.raw_points[point][1], scale.minY, scale.maxY, SVG.marginBottom, SVG.holder.parentElement.offsetHeight - SVG.marginTop);
x.push(SVG.newCoordinates(SVG.raw_points[point][0], scale.minX, scale.maxX, SVG.marginLeft, SVG.holder.parentElement.offsetWidth - SVG.marginRight));
y.push(SVG.newCoordinates(SVG.raw_points[point][1], scale.minY, scale.maxY, SVG.marginBottom, SVG.holder.parentElement.offsetHeight - SVG.marginTop));
circle = document.createElementNS(SVG.ns, 'circle');
circle.setAttribute('class', 'point');
circle.setAttribute('cx', x);
circle.setAttribute('cy', y);
circle.setAttribute('cx', x[point]);
circle.setAttribute('cy', y[point]);
circle.setAttribute('r', 4);
circle.setAttribute('fill', '#333');
circle.setAttribute('stroke', '#3f72bf');
@ -176,22 +234,28 @@ SVG.draw = function() {
circle.addEventListener('mouseover', function() { this.setAttribute('r', '6'); })
circle.addEventListener('mouseout', function() { this.setAttribute('r', '4'); })
if(points.length > 0) {
last_point = points[points.length - 1];
line = document.createElementNS(SVG.ns, 'line');
line.setAttribute('class', 'line');
line.setAttribute('x1', last_point[0]);
line.setAttribute('x2', x);
line.setAttribute('y1', last_point[1]);
line.setAttribute('y2', y);
line.setAttribute('stroke', '#3f72bf');
line.setAttribute('stroke-width', 2);
SVG.g.appendChild(line);
}
points.push([x, y]);
}
var px = SVG.getControlPoints(x);
var py = SVG.getControlPoints(y);
var path = '';
for(point = 0; point < SVG.raw_points.length - 1; point++) {
path += 'C '+px.p1[point]+' '+py.p1[point]+' '+px.p2[point]+' '+py.p2[point]+' '+x[point+1]+' '+y[point+1]+' ';
}
line = document.createElementNS(SVG.ns, 'path');
line.setAttribute('class', 'graph');
line.setAttribute('fill', '#3f72bf');
line.setAttribute('opacity', '0.25');
line.setAttribute('stroke', 'none');
line.setAttribute('d', 'M '+SVG.marginLeft+' '+SVG.marginBottom+' L '+x[0]+' '+y[0]+' '+ path + ' M '+SVG.marginLeft+' '+SVG.marginBottom+' Z');
SVG.g.insertBefore(line, SVG.g.querySelectorAll('.point')[0]);
line = document.createElementNS(SVG.ns, 'path');
line.setAttribute('class', 'line');
line.setAttribute('stroke', '#3f72bf');
line.setAttribute('stroke-width', 2);
line.setAttribute('fill', 'none');
line.setAttribute('d', 'M '+x[0]+' '+y[0]+' '+path);
SVG.g.appendChild(line);
}
var old = window.onresize || function() {};
@ -200,7 +264,7 @@ window.onresize = function() {
if(SVG.g !== false) {
SVG.g.setAttribute('transform', 'translate(0, ' + SVG.holder.parentElement.offsetHeight + ') scale(1, -1)');
SVG.axis.setAttribute('x2', holder.offsetWidth - 13 - SVG.marginRight);
[].forEach.call(SVG.holder.querySelectorAll('.point, .line'), function(el) {
[].forEach.call(SVG.holder.querySelectorAll('.point, .line, .graph'), function(el) {
el.parentElement.removeChild(el);
});
SVG.draw();