Difference between revisions of "Bearing"

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Line 1: Line 1:
 +
This is an example of bidirectional communication of JSXGraph with other elements of the web page. a You can type a new value for the angle into the text box and see the actual value of the angle in the text box.
 +
<br /><br />
 
<html>
 
<html>
<form>
 
 
<input type="text" id="degrees">
 
<input type="text" id="degrees">
<input type="button" value="set direction" onclick="setDirection()">
+
<button onclick="setDirection()">set direction</button>
</form>
 
 
</html>
 
</html>
 
<jsxgraph width="600" height="500">
 
<jsxgraph width="600" height="500">
Line 9: Line 9:
 
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'}); // global variable
 
var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable
brd.addHook(function(){
+
p.on('drag', function(){
 
                   document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
 
                   document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
 
             });
 
             });
Line 16: Line 16:
 
   var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
 
   var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
 
   var r = c.Radius();
 
   var r = c.Radius();
   p.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);
+
   p.moveTo([r*Math.cos(phi),r*Math.sin(phi)],1000);
 
 
 
}
 
}
 
</jsxgraph>
 
</jsxgraph>
Line 23: Line 22:
 
===The underlying JavaScript code===
 
===The underlying JavaScript code===
 
<source lang="html4strict">
 
<source lang="html4strict">
<form>
 
 
<input type="text" id="degrees">
 
<input type="text" id="degrees">
<input type="button" value="set direction" onclick="setDirection()">
+
<button onclick="setDirection()">set direction</button>
</form>
 
 
</source>
 
</source>
  
Line 33: Line 30:
 
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'}); // global variable
 
var p = brd.create('glider',[-1,0.5,c],{name:'drag me'}); // global variable
brd.addHook(function(){
+
p.on('drag', function(){
 
                   document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
 
                   document.getElementById('degrees').value = (Math.atan2(p.Y(),p.X())*180/Math.PI).toFixed(0);
 
             });
 
             });
Line 40: Line 37:
 
   var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
 
   var phi = 1*document.getElementById('degrees').value*Math.PI/180.0;
 
   var r = c.Radius();
 
   var r = c.Radius();
   p.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);
+
   p.moveTo([r*Math.cos(phi),r*Math.sin(phi)],1000);
  
 
}
 
}
 
</source>
 
</source>
  
===Version 2===
+
==Version 2==
  
 
<html>
 
<html>
<form>
 
 
<input type="text" id="degrees2">
 
<input type="text" id="degrees2">
<input type="button" value="set direction" onclick="setDirection2()">
+
<button onclick="setDirection2()">set direction</button>
</form>
 
 
</html>
 
</html>
 
<jsxgraph box="box2" width="600" height="500">
 
<jsxgraph box="box2" width="600" height="500">
 
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
 
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var p1 = brd2.create('point',[0,0]);
+
var p1 = brd2.create('point',[0,0], {visible:false, fixed:true});
 
var p2 = brd2.create('point',[1,0]);
 
var p2 = brd2.create('point',[1,0]);
 
var p3 = brd2.create('point',[0,1]);
 
var p3 = brd2.create('point',[0,1]);
Line 61: Line 56:
  
 
var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
 
var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
brd2.addHook(function(){
+
brd2.create('segment',[q,p1]);
 +
 
 +
q.on('drag', function(){
 
                   document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
 
                   document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
 
             });
 
             });
Line 75: Line 72:
 
===The underlying JavaScript code===
 
===The underlying JavaScript code===
 
<source lang="html4strict">
 
<source lang="html4strict">
<form>
+
<input type="text" id="degrees2">
<input type="text" id="degrees">
+
<button onclick="setDirection2()">set direction</button>
<input type="button" value="set direction" onclick="setDirection2()">
 
</form>
 
 
</source>
 
</source>
  
 
<source lang="javascript">
 
<source lang="javascript">
 
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
 
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var p1 = brd2.create('point',[0,0]);
+
var p1 = brd2.create('point',[0,0], {visible:false, fixed:true});
 
var p2 = brd2.create('point',[1,0]);
 
var p2 = brd2.create('point',[1,0]);
 
var p3 = brd2.create('point',[0,1]);
 
var p3 = brd2.create('point',[0,1]);
Line 89: Line 84:
  
 
var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
 
var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
brd2.addHook(function(){
+
brd2.create('segment',[q,p1]);
 +
q.on('drag', function(){
 
                   document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
 
                   document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
 
             });
 
             });

Latest revision as of 09:57, 6 April 2017

This is an example of bidirectional communication of JSXGraph with other elements of the web page. a You can type a new value for the angle into the text box and see the actual value of the angle in the text box.

The underlying JavaScript code

<input type="text" id="degrees">
<button onclick="setDirection()">set direction</button>
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
p.on('drag', 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)],1000);

}

Version 2

The underlying JavaScript code

<input type="text" id="degrees2">
<button onclick="setDirection2()">set direction</button>
var brd2 = JXG.JSXGraph.initBoard('box2',{axis:true,boundingbox:[-2,1.5,2,-1.5],keepaspectratio:true});
var p1 = brd2.create('point',[0,0], {visible:false, fixed:true});
var p2 = brd2.create('point',[1,0]);
var p3 = brd2.create('point',[0,1]);
var a = brd2.create('arc',[p1,p2,p3]);

var q = brd2.create('glider',[0.5,0.5,a],{name:'drag me'}); // global variable
brd2.create('segment',[q,p1]);
q.on('drag', function(){
                  document.getElementById('degrees2').value = (Math.atan2(q.Y(),q.X())*180/Math.PI).toFixed(0);
            });

var setDirection2 = function() {
   var phi = 1*document.getElementById('degrees2').value*Math.PI/180.0;
   var r = a.Radius();
   q.moveTo([r*Math.cos(phi),r*Math.sin(phi)]);

}