Difference between revisions of "Bearing"
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} | } | ||
</source> | </source> | ||
+ | |||
+ | ===Version 2=== | ||
+ | |||
+ | <html> | ||
+ | <form> | ||
+ | <input type="text" id="degrees"> | ||
+ | <input type="button" value="set direction" onclick="setDirection()"> | ||
+ | </form> | ||
+ | </html> | ||
+ | <jsxgraph width="600" height="500"> | ||
+ | var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true}); | ||
+ | var c = brd.create('arc',[[1,0],[0,0],[0,1]]); | ||
+ | var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable | ||
+ | brd.addHook(function(){ | ||
+ | document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0); | ||
+ | }); | ||
+ | |||
+ | var setDirection = function() { | ||
+ | var phi = 1*document.getElementById('degrees').value*Math.PI/180.0; | ||
+ | var r = c.Radius(); | ||
+ | p.moveTo([r*Math.cos(phi),r*Math.sin(phi)]); | ||
+ | |||
+ | } | ||
+ | </jsxgraph> | ||
+ | |||
[[Category:Examples]] | [[Category:Examples]] |
Revision as of 18:24, 16 June 2010
The underlying JavaScript code
<form>
<input type="text" id="degrees">
<input type="button" value="set direction" onclick="setDirection()">
</form>
var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var c = brd.create('circle',[[0,0],1]);
var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable
brd.addHook(function(){
document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
});
var setDirection = function() {
var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
var r = c.Radius();
p.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);
}
Version 2