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Listing 29 . Source code for the program named GM01test05.
/*GM01test05.java
Copyright 2008, R.G.BaldwinRevised 02/24/08
This program illustrates vector addition in 3D.Tested using JDK 1.6 under WinXP.
*********************************************************/import java.awt.*;
import javax.swing.*;import java.awt.geom.*;
class GM01test05{public static void main(String[] args){GUI guiObj = new GUI();
}//end main}//end controlling class GM01test05
//======================================================//class GUI extends JFrame{
//Specify the horizontal and vertical size of a JFrame// object.
int hSize = 300;int vSize = 200;
Image osi;//an off-screen imageint osiWidth;//off-screen image width
int osiHeight;//off-screen image heightMyCanvas myCanvas;//a subclass of CanvasGUI(){//constructor
//Set JFrame size, title, and close operation.setSize(hSize,vSize);
setTitle("Copyright 2008,R.G.Baldwin");setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//Create a new drawing canvas and add it to the
// center of the JFrame.myCanvas = new MyCanvas();
this.getContentPane().add(myCanvas);//This object must be visible before you can get an// off-screen image. It must also be visible before
// you can compute the size of the canvas.setVisible(true);
osiWidth = myCanvas.getWidth();osiHeight = myCanvas.getHeight();
//Create an off-screen image and get a graphics// context on it.
osi = createImage(osiWidth,osiHeight);Graphics2D g2D = (Graphics2D)(osi.getGraphics());//Draw on the off-screen image.
drawOffScreen(g2D);//Cause the overridden paint method belonging to
// myCanvas to be executed.myCanvas.repaint();
}//end constructor//----------------------------------------------------//
//The purpose of this method is to illustrate vector// addition in 3D
void drawOffScreen(Graphics2D g2D){//Translate the origin on the off-screen image, draw a// pair of orthogonal axes on it that intersect at the
// origin, and paint the background white.setCoordinateFrame(g2D);//Define two vectors that will be added.
GM01.Vector3D vecA = new GM01.Vector3D(new GM01.ColMatrix3D(75,75,75));GM01.Vector3D vecB = new GM01.Vector3D(
new GM01.ColMatrix3D(-15,10,-50));//Create a ref point at the origin for convenience.GM01.Point3D zeroPoint = new GM01.Point3D(
new GM01.ColMatrix3D(0,0,0));//Draw vecA in MAGENTA with its tail at the origin.g2D.setColor(Color.MAGENTA);
vecA.draw(g2D,zeroPoint);//Draw vecB in LIGHT_GRAY with its tail at the head// of vecA.
g2D.setColor(Color.LIGHT_GRAY);GM01.Point3D temp =
new GM01.Point3D(vecA.getColMatrix());vecB.draw(g2D,temp);//Draw vecB in LIGHT_GRAY with its tail at the origin.
vecB.draw(g2D,zeroPoint);//Draw vecA in MAGENTA with its tail at the head// of vecB. This completes a trapezoid.
g2D.setColor(Color.MAGENTA);vecA.draw(g2D,new GM01.Point3D(vecB.getColMatrix()));//Add the two vectors.
GM01.Vector3D sum = vecA.add(vecB);//Draw sum in BLACK with its tail at the origin.
g2D.setColor(Color.BLACK);sum.draw(g2D,zeroPoint);
}//end drawOffScreen//----------------------------------------------------//
//This method is used to set the origin of the// off-screen image, set the background color to WHITE,
// and draw orthogonal 3D axes on the off-screen image// that intersect at the origin.
private void setCoordinateFrame(Graphics2D g2D){//Translate the origin to the center.
GM01.translate(g2D,0.5*osiWidth,-0.5*osiHeight);//Set background color to WHITE.g2D.setColor(Color.WHITE);
GM01.fillRect(g2D,-osiWidth/2,osiHeight/2,osiWidth,osiHeight);
//Draw x-axis in REDg2D.setColor(Color.RED);
GM01.Point3D pointA =new GM01.Point3D(new GM01.ColMatrix3D(-75,0,0));
GM01.Point3D pointB =new GM01.Point3D(new GM01.ColMatrix3D(75,0,0));
pointA.draw(g2D);pointB.draw(g2D);
new GM01.Line3D(pointA,pointB).draw(g2D);//Draw y-axis in GREENg2D.setColor(Color.GREEN);
pointA =new GM01.Point3D(new GM01.ColMatrix3D(0,-75,0));
pointB =new GM01.Point3D(new GM01.ColMatrix3D(0,75,0));
pointA.draw(g2D);pointB.draw(g2D);
new GM01.Line3D(pointA,pointB).draw(g2D);//Draw z-axis in BLUEg2D.setColor(Color.BLUE);
pointA =new GM01.Point3D(new GM01.ColMatrix3D(0,0,-75));
pointB =new GM01.Point3D(new GM01.ColMatrix3D(0,0,75));
pointA.draw(g2D);pointB.draw(g2D);
new GM01.Line3D(pointA,pointB).draw(g2D);}//end setCoordinateFrame method
//====================================================////This is an inner class of the GUI class.class MyCanvas extends Canvas{
//Override the paint() method. This method will be// called when the JFrame and the Canvas appear on the
// screen or when the repaint method is called on the// Canvas object.
//The purpose of this method is to display the// off-screen image on the screen.
public void paint(Graphics g){g.drawImage(osi,0,0,this);
}//end overridden paint()}//end inner class MyCanvas}//end class GUI//======================================================//
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