Bearing: Difference between revisions
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A WASSERMANN (talk | contribs) No edit summary |
A WASSERMANN (talk | contribs) No edit summary |
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<form> | <form> | ||
<input type="text" id="degrees"> | <input type="text" id="degrees"> | ||
<input type="button" value="set dircetion" onclick="setDirection()"> | |||
</form> | </form> | ||
</html> | </html> | ||
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var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true}); | 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 c = brd.create('circle',[[0,0],1]); | ||
var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); | var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable | ||
brd.addHook(function(){ | brd.addHook(function(){ | ||
document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(1); | 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)]); | |||
} | |||
</jsxgraph> | </jsxgraph> | ||
Revision as of 16:14, 16 June 2010
