Difference between revisions of "Bearing"
From JSXGraph Wiki
A WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
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| Line 2: | Line 2: | ||
<form> | <form> | ||
<input type="text" id="degrees"> | <input type="text" id="degrees"> | ||
| − | <input type="button" value="set | + | <input type="button" value="set direction" onclick="setDirection()"> |
</form> | </form> | ||
</html> | </html> | ||
| Line 20: | Line 20: | ||
} | } | ||
</jsxgraph> | </jsxgraph> | ||
| + | |||
| + | ===The underlying JavaScript code=== | ||
| + | <code html4strict" | ||
| + | <input type="text" id="degrees"> | ||
| + | <input type="button" value="set direction" onclick="setDirection()"> | ||
| + | </source> | ||
| + | |||
| + | <source lang="javascript"> | ||
| + | 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(1); | ||
| + | }); | ||
| + | |||
| + | 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)]); | ||
| + | |||
| + | } | ||
| + | </source> | ||
| + | |||
| + | [[Category:Examples]] | ||
Revision as of 17:15, 16 June 2010
The underlying JavaScript code
<code html4strict" <input type="text" id="degrees"> <input type="button" value="set direction" onclick="setDirection()"> </source>
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(1);
});
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)]);
}
