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The GM01.Line3D.draw method is shown in Listing 6 .
| Listing 6 . The GM01.Line3D.draw method. |
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public void draw(Graphics2D g2D){//Get 2D projection coordinates.
GM01.ColMatrix2D tail =convert3Dto2D(getTail().point);
GM01.ColMatrix2D head =convert3Dto2D(getHead().point);
drawLine(g2D,tail.getData(0),tail.getData(1),
head.getData(0),head.getData(1));
}//end draw |
The code in Listing 6 is so similar to the code in Listing 5 that no further explanation should be required.
Now back to the program named GM01test01
A complete listing of the program named GM01test01 is provided in Listing 28 near the end of the module.
Because all of the 3D classes in the game-math library are new to this update, I felt the need to write a program that would step through and test thebehavior of most of the 3D methods in the library. That was the purpose of the program named GM01test01 .
Like the program named GM01test02 discussed earlier, this program produces both a graphic screen output and lots of text on thecommand-line screen. The graphic output is shown in Figure 1 . I won't waste space printing the command-line output in this tutorial. Ifyou want to see it, you can copy, compile, and run the program from Listing 28 and produce that output yourself.
The graphic output
The graphic output shown in Figure 1 is produced by the method named drawOffScreen , which begins in Listing 7 . I will briefly walk you through this method because everything in it is new. However, much of thecode is very similar to 2D code that I have explained before.
| Listing 7 . Beginning of the drawOffScreen method in GM01test01. |
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void drawOffScreen(Graphics2D g2D){//Translate the origin on the off-screen
// image and draw a pair of orthogonal axes on it.setCoordinateFrame(g2D);
//Define eight points that define the corners of// a box in 3D that is centered on the origin.GM01.Point3D[] points = new GM01.Point3D[8];
//Right sidepoints[0] =new GM01.Point3D(new GM01.ColMatrix3D(75,75,75));
points[1]=
new GM01.Point3D(new GM01.ColMatrix3D(75,75,-75));points[2] =new GM01.Point3D(new GM01.ColMatrix3D(75,-75,-75));
points[3]=
new GM01.Point3D(new GM01.ColMatrix3D(75,-75,75));//Left side
points[4]=
new GM01.Point3D(new GM01.ColMatrix3D(-75,75,75));points[5] =new GM01.Point3D(new GM01.ColMatrix3D(-75,75,-75));
points[6]=
new GM01.Point3D(new GM01.ColMatrix3D(-75,-75,-75));points[7] =new GM01.Point3D(new GM01.ColMatrix3D(-75,-75,75)); |
After translating the origin to the center of the off-screen image, Listing 7 instantiates eight GM01Point3D objects that define the corners of the 3D box shown in Figure 1 . References to the eight objects are stored in the elements of an array object referred to by thevariable named points . Although this code uses three coordinate values instead of two coordinate values to instantiate the objects, thesyntax should be very familiar to you by now.
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