Geometric constructions with JessieScript

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Revision as of 15:25, 21 March 2010 by Bianca (talk | contribs)

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Easy JSXGraph constructions with geometric elements can be created by a mathematical syntax by using the function

board.construct(...);

Possible elements:

Construction Description
A(1,1) Point with name 'A' at the position (1,1)
1) Point with name 'XY' at the position (1,1)
]AB[ straight line through the points A and B
[AB[ ray through the points A and B, stopping at A
]AB] ray through the points A and B, stopping at B
[AB] segment through the points A and B
g=[AB] segment through the points A and B, named by 'g'
k(A,1) circle with midpoint A and radius 1
k(A,B) circle with midpoint A through the point B on the circle line
k(A,[BC]) circle with midpoint A and radius defined by the length of the (not necessarily existing) segement [BC]
k_1=k(A,1) circle with midpoint A and radius 1, named by 'k_1'

The different elements have to be separated by semicolon.

Example

The JavaScript code

<jsxgraph width="500" height="400" box="box">
        var cons1, cons2;
        board = JXG.JSXGraph.initBoard('box', {grid:true, originX: 50, originY: 300, unitX: 50, unitY: 50, axis:true});
        
        cons1 = board.construct("A(1,1);B(2,2.5);C(1,3);G(5,3);H(6,4);[GH];k(G,1);AB(5,-1);X(6,-1);Y(7,-2);k(Y,X);k(A,[BC]);k(B,[AC]);");
        cons2 = board.construct("J(7,4);[GJ[;K(8,4);]GK[;L(2.4|5);f=[AC];k1=k(C,0.5);C_1(4|4);l_2=[BC]");
        
        cons1.points[0].setProperty({face:'diamond',size:7,strokeColor:'#8B2252',fillColor:'#8B2252'});
        cons1.circles[1].setProperty({strokeColor:'#BA55D3'});
        cons2.J.setProperty({face:'triangleUp',size:8,strokeColor:'black',fillColor:'#EE82EE'});
        cons2.lines[1].setProperty({strokeColor:'#32CD32',shadow:true});
        
        cons1.X.strokeColor('black');
        cons1.X.fillColor('#FFB90F');
        cons1.X.shadow(true);
        cons1.Y.visible(false);
        cons2.l_2.strokeWidth(4);
        cons1.X.face('>');
        cons1.X.size(8);
        cons1.X.labelColor('#FFB90F');
        cons2.k1.dash(2);
</jsxgraph>