Difference between revisions of "Bezier curves"
From JSXGraph Wiki
Jump to navigationJump to searchA WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
||
| Line 36: | Line 36: | ||
p.push(brd.createElement('point',[Math.random()*8-4,Math.random()*8-4], | p.push(brd.createElement('point',[Math.random()*8-4,Math.random()*8-4], | ||
{strokeColor:col,fillColor:col})); // data point | {strokeColor:col,fillColor:col})); // data point | ||
| + | brd.unsuspendUpdate(); | ||
| + | }; | ||
| + | |||
| + | var removeSegment = function() { | ||
| + | brd.suspendUpdate(); | ||
| + | if (p.length>4) { | ||
| + | p.splice(p.length-3,3); | ||
| + | } | ||
brd.unsuspendUpdate(); | brd.unsuspendUpdate(); | ||
}; | }; | ||
Revision as of 08:52, 29 September 2009
The red points are connected by a cubic Bezier curve. The blue points are the control points.
The underlying JavaScript code
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-4,4,4,-4],keepaspectratio:true,axis:true});
var p = [];
col = 'red';
p.push(brd.createElement('point',[2,1],{strokeColor:col,fillColor:col})); // data point
col = 'blue';
p.push(brd.createElement('point',[0.75,2.5],{strokeColor:col,fillColor:col})); // control point
p.push(brd.createElement('point',[-0.3,0.3],{strokeColor:col,fillColor:col})); // control point
col = 'red';
p.push(brd.createElement('point',[-3,1],{strokeColor:col,fillColor:col})); // data point
col = 'blue';
p.push(brd.createElement('point',[-0.75,-2.5],{strokeColor:col,fillColor:col})); // control point
p.push(brd.createElement('point',[1.5,-2.8],{strokeColor:col,fillColor:col})); // control point
col = 'red';
p.push(brd.createElement('point',[2,-0.5],{strokeColor:col,fillColor:col})); // data point
var c = brd.createElement('curve', JXG.Math.Numerics.bezier(p), {strokecolor:'blue', strokeOpacity:0.6, strokeWidth:5});
