Intersection of curves I: Difference between revisions

From JSXGraph Wiki
(Created page with "<jsxgraph box="jxgbox" width="600" height="600"> var board = JXG.JSXGraph.initBoard('jxgbox', { axis:true, boundingbox:[-15, 10, 10, -10] }); var p = []; p.push(board...")
 
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Line 10: Line 10:
p.push(board.create('point', [-3, 3]));
p.push(board.create('point', [-3, 3]));


var curve1 = board.create('ellipse', p,
var curve1 = board.create('ellipse', p, {strokeColor: 'black'});
                {strokeColor: 'black'});


var curve2 = board.create('curve', [function(phi){return 4 * Math.cos(2*phi); },  
var curve2 = board.create('curve', [function(phi){return 4 * Math.cos(2*phi); },  
Line 29: Line 28:
board.update();
board.update();
</jsxgraph>
</jsxgraph>
==The underlying JavaScript code==
<source lang="javascript">
var board = JXG.JSXGraph.initBoard('jxgbox', {
    axis:true,
    boundingbox:[-15, 10, 10, -10]
});
var p = [];
p.push(board.create('point', [0, -5]));
p.push(board.create('point', [-5, 0]));
p.push(board.create('point', [-3, 3]));
var curve1 = board.create('ellipse', p, {strokeColor: 'black'});
var curve2 = board.create('curve', [function(phi){return 4 * Math.cos(2*phi); },
                                    [0, 0],
                                    0, 2 * Math.PI],
                      {curveType:'polar', strokeColor: 'blue', strokewidth:1});
var clip_path = board.create('curve', [[], []], {strokeWidth: 3, fillColor: 'yellow', fillOpacity: 0.3});
clip_path.updateDataArray = function() {
    var a = JXG.Math.Clip.intersection(curve2, curve1, this.board);
    this.dataX = a[0];
    this.dataY = a[1];
};
board.update();
</source>
[[Category:Examples]]
[[Category:Curves]]

Latest revision as of 09:23, 28 March 2020

The underlying JavaScript code

var board = JXG.JSXGraph.initBoard('jxgbox', {
    axis:true,
    boundingbox:[-15, 10, 10, -10]
});

var p = [];
p.push(board.create('point', [0, -5]));
p.push(board.create('point', [-5, 0]));
p.push(board.create('point', [-3, 3]));

var curve1 = board.create('ellipse', p, {strokeColor: 'black'});

var curve2 = board.create('curve', [function(phi){return 4 * Math.cos(2*phi); }, 
                                    [0, 0], 
                                    0, 2 * Math.PI],
                      {curveType:'polar', strokeColor: 'blue', strokewidth:1});


var clip_path = board.create('curve', [[], []], {strokeWidth: 3, fillColor: 'yellow', fillOpacity: 0.3});
clip_path.updateDataArray = function() {
    var a = JXG.Math.Clip.intersection(curve2, curve1, this.board);

    this.dataX = a[0];
    this.dataY = a[1];
};

board.update();