Difference between revisions of "Geometric constructions with JessieScript"

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! Construction !! Description
 
! Construction !! Description
 
|-
 
|-
| A(1,1)    || Point with name 'A' at the position (1,1)
+
| A(1,1)    || Point with name 'A' at position (1,1)
 
|-
 
|-
| ZY(0.5<nowiki>|</nowiki>1)    || Point with name 'ZY' at the position (0.5,1)
+
| ZY(0.5<nowiki>|</nowiki>1)    || Point with name 'ZY' at position (0.5,1)
 
|-
 
|-
| ]AB[    || straight line through the points A and B
+
| ]AB[    || straight line through points A and B
 
|-
 
|-
| [AB[    || ray through the points A and B, stopping at A
+
| [AB[    || ray through points A and B, stopping at A
 
|-
 
|-
| ]AB]    || ray through the points A and B, stopping at B
+
| ]AB]    || ray through points A and B, stopping at B
 
|-
 
|-
| [AB]    || segment through the points A and B
+
| [AB]    || segment through points A and B
 
|-
 
|-
| g=[AB]    || segment through the points A and B, named by 'g'
+
| g=[AB]    || segment through points A and B, named by 'g'
 
|-
 
|-
 
| k(A,1)    || circle with midpoint A and radius 1
 
| 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,B)    || circle with midpoint A through 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(A,[BC])    || circle with midpoint A and radius defined by the length of the (not necessarily existing) segement [BC]
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! Element !! Description
 
! Element !! Description
 
|-
 
|-
| constr.points[i]    || take the i-th point of the construction 'constr'
+
| constr.points[i]    || take i-th point of the construction 'constr'
 
|-
 
|-
| constr.lines[i]    || take the i-th line (or rays or segement) of the construction 'constr'
+
| constr.lines[i]    || take i-th line (or rays or segement) of the construction 'constr'
 
|-
 
|-
| constr.circles[i]    || take the i-th circle of the construction 'constr'
+
| constr.circles[i]    || take i-th circle of the construction 'constr'
 
|-
 
|-
| constr.A    || take the element with name 'A' of the construction 'constr'
+
| constr.A    || take element with name 'A' of the construction 'constr'
 
|}
 
|}
 
===Example===
 
===Example===

Revision as of 17:28, 23 March 2010

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 position (1,1)
ZY(0.5|1) Point with name 'ZY' at position (0.5,1)
]AB[ straight line through points A and B
[AB[ ray through points A and B, stopping at A
]AB] ray through points A and B, stopping at B
[AB] segment through points A and B
g=[AB] segment through 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 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.

The function returns an object with all the created elements so that afterwards properties can be set. The access works by

Element Description
constr.points[i] take i-th point of the construction 'constr'
constr.lines[i] take i-th line (or rays or segement) of the construction 'constr'
constr.circles[i] take i-th circle of the construction 'constr'
constr.A take element with name 'A' of the construction 'constr'

Example

The JavaScript code

<jsxgraph width="600" height="450" box="box">
        var board, 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>