Text on Graphs

Axis Titles

To set a title on the x-axis or y-axis use setXtitle ( ) or setYtitle ( ):

var wGraph = new cGraph(400,200);
wGraph.setXrange(-3,3);
wGraph.drawFunction("sin(Math.PI*x)");
wGraph.setXtitle("x / pi");
wGraph.setYtitle("sin ( x )");
wGraph.printInWindow("","Axis Titles");

Labeling the Drawings

It's often useful to label the drawings, especially when there are more than drawing on the graph. To write a label on the last drawing drawn on the graph, use addLabel ( ):

var wGraph = new cGraph(400,200);
wGraph.setXrange(-3,3);
wGraph.setXtitle("x / pi");
wGraph.drawFunction("sin(Math.PI*x)");
wGraph.drawFunction("cos(Math.PI*x)");
wGraph.printInWindow("","Labeling the Drawings");

The cGraph method addLabel ( ) adds to the last cDrawing object added to the graph. You can add a label to any drawing any place before print(), using the cDrawing addLabel ( ) method, but this means that you need to identify the drawings (by naming them). The above graph could have been written:

var wGraph = new cGraph(400,200);
wGraph.setXrange(-3,3);
wGraph.setXtitle("x / pi");
var wFunc1 = wGraph.drawFunction("sin(Math.PI*x)");
var wFunc2 = wGraph.drawFunction("cos(Math.PI*x)");
wGraph.printInWindow("","Labeling the Drawings");

Note that there can only be one label per drawing, and that the label is drawn in the same colour as the drawing itself.

Text on a Diagram

You can only add one label per drawing, but you can write as much free text as you like, using the drawText ( ) method. These texts are not linked to any particular drawing, and they are always coloured black:

var wGraph = new cGraph(200,200);
wGraph.setXgrid(0);
wGraph.setYstretch(1);
wGraph.drawCurve("cos(t)","sin(t)",Math.PI/2,5*Math.PI/2,5);
wGraph.drawText("Pentagon",-0.35,0);
wGraph.printInWindow("","Text on a Diagram");