Doja平台3D基础示例

Doja平台3D基础示例

这个示例在前面示例的基础上进行了改进，实现了doja平台上3D常见的操作，比如偏移，缩放，旋转，光照等效果，不过由于没有使用纹理，光照效果不明显～～。 飘飘白云

import com.nttdocomo.ui.*;

import com.nttdocomo.opt.ui.j3d.*;

//

/**

* @author ppby 2006-01-25

* Doja3D foundation

*/

public class Doja3D extends IApplication {

private Canvas3D canv;

public void start() {

try {

canv = new Canvas3D();

Display.setCurrent(canv);

Thread thread = new Thread(canv);

thread.start();

} catch (IllegalThreadStateException itse) {

itse.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

}

/**

* Canvas class

*/

class Canvas3D extends Canvas implements Runnable {

// Command list array

private int[] cmdListFunc_;

private int[] cmdListPrim_;

// 3D affine transformation matrix

private AffineTrans viewT = new AffineTrans();

private AffineTrans affineT = new AffineTrans();

private AffineTrans rotateT = new AffineTrans();

private AffineTrans scaleT = new AffineTrans();

private AffineTrans translateT = new AffineTrans();

private int rotX, rotY; // Variable for rotation

private int nScale; // Variable for scale

private int nTransX,nTransY;//Variable for translation

private Vector3D vLightDirection ;//direction of directing light

private boolean bAmbientLight = false;//enable ambient light flag

private int nLight; //intensity of ambient light

public Canvas3D() {

// Set a camera:(eye position,look at position,up direction)

viewT.lookAt(

new Vector3D(0, 0, 800),

new Vector3D(0, 0, 0),

new Vector3D(0, 4096, 0)

);

vLightDirection = new Vector3D(4096/4, 4096/4, 4096);//direction of Light

// Set a command list

setupCmdListFunc();

setupCmdListPrim();

}

public void run() {

while (true) {

UpdateAffineTrans();

repaint();

try {

Thread.sleep(100); // wait 100ms

} catch (InterruptedException ie) {

}

}

}

public void UpdateAffineTrans()

{

affineT.setIdentity();

/*

* Translate

*/

translateT.setIdentity();

translateT.m03 += nTransX;

translateT.m13 += nTransY;

affineT.mul(translateT);

/*

* Rotate

*/

//rotate y axis

rotateT.setIdentity();

rotateT.setRotateY(rotY);

affineT.mul(rotateT);

//rotate x axis

rotateT.setIdentity();

rotateT.setRotateX(rotX);

affineT.mul(rotateT,affineT);//same as affineT.mul(rotateT);

/*

* Scale:What will happen if scaleT.mXX < 0?~~

*/

scaleT.setIdentity();

scaleT.setElement(0, 0, scaleT.m00 + nScale);

scaleT.setElement(1, 1, scaleT.m11 + nScale);

//The follow two lines have the same effect.

// scaleT.m00 += nScale;

// scaleT.m11 += nScale;

affineT.mul(scaleT,affineT);

}

/**

* Rendering method.

*/

public void paint(Graphics g) {

if (g == null)

return;

try {

g.lock();

// Background Clear

g.setColor(Graphics.getColorOfRGB(0, 0, 0));

g.fillRect(0, 0, getWidth(), getHeight());

g.setColor(Graphics.getColorOfRGB(150, 150, 120));

Graphics3D g3d = (Graphics3D) g;

//Method 1

g3d.setClipRect3D(0, 0, getWidth(),getHeight());

g3d.setScreenCenter(getWidth()>>1, getHeight()>>1);

g3d.setPerspective(200, 10000, 4096*50/360);

//Method 2:The effect is the same s method 1.

//g3d.executeCommandList(cmdListFunc_); // Excute the command list

//light: The lighting effect is not obvious in this program.

//If i use texture ,it maybe obviously to see lighting effect.

g3d.setDirectionLight(vLightDirection, nLight );

if( bAmbientLight )

g3d.setAmbientLight(nLight);

g3d.enableLight(true);

//set viewport

affineT.mul(viewT,affineT);

g3d.setViewTrans(affineT); // Set view coordinate matrix

setupCmdListPrim();

g3d.executeCommandList(cmdListPrim_); // Excute a command list

//g3d.flush();//It has been done when executeCommandList.

g.setColor(Graphics.getColorOfRGB(0, 255, 0xff));

g.drawString("Rotate:up,down,left,right key.", 5, Font.getDefaultFont().getHeight());

g.drawString("Scale :KEY_1,KEY_3", 5, 5+2*Font.getDefaultFont().getHeight());

g.drawString("Translate :KEY_4,6,8,2", 5, 10+3*Font.getDefaultFont().getHeight());

g.drawString("Light :KEY_0,7,9", 5, 15+4*Font.getDefaultFont().getHeight());

g.unlock(true);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* Key event process.

*/

public void processEvent(int type, int param) {

try {

if (type == Display.KEY_PRESSED_EVENT) {

switch (param) {

//rotate

case Display.KEY_UP:

rotX -= 128;

rotX %= 4096;

break;

case Display.KEY_DOWN:

rotX += 128;

rotX %= 4096;

break;

case Display.KEY_LEFT:

rotY -= 128;

rotY %= 4096;

break;

case Display.KEY_RIGHT:

rotY += 128;

rotY %= 4096;

break;

//scale

case Display.KEY_1:

nScale += 128;

break;

case Display.KEY_3:

nScale -= 128;

break;

//translate

case Display.KEY_4:

nTransX -= 15;

break;

case Display.KEY_6:

nTransX += 15;

break;

case Display.KEY_8:

nTransY -= 15;

break;

case Display.KEY_2:

nTransY += 15;

break;

//light

case Display.KEY_0:

bAmbientLight = !bAmbientLight;

break;

case Display.KEY_7:

nLight -= 512;

nLight %= 4096;

nLight = (nLight<0?-nLight:nLight);

break;

case Display.KEY_9:

nLight += 512;

nLight %= 4096;

break;

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* Set the command list for methods.

* @return true - success. false - fail.

*/

private boolean setupCmdListFunc() {

try {

int[] cmdListFunc = {

Graphics3D.COMMAND_LIST_VERSION_1,

Graphics3D.COMMAND_CLIP_RECT, 0, 0, getWidth(),

getHeight(), Graphics3D.COMMAND_SCREEN_CENTER,

(getWidth() >> 1), (getHeight() >> 1),

Graphics3D.COMMAND_PERSPECTIVE1, 200, 10000,

4096 * 50 / 360, Graphics3D.COMMAND_END };

cmdListFunc_ = cmdListFunc;

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* Set the command list for primitives.

* @return true - Setting succeeded. false - Setting failed.

*/

private boolean setupCmdListPrim() {

try {

//draw four trangles.

int[] cmdListPrim = {

Graphics3D.COMMAND_LIST_VERSION_1,

// TRIANGLES

(Graphics3D.COMMAND_RENDER_TRIANGLES

| Graphics3D.COLOR_PER_FACE | (4 << 16)),//trangle NUM << 16

//each trangle's three vertexes.vertex:(x,y,z)

0, 120, 0, -120, -120, 120, 120, -120, 120,

0, 120, 0, 120, -120, 120, 120, -120, -120,

0, 120, 0, 120, -120, -120, -120, -120, -120,

0, 120, 0, -120, -120, -120, -120, -120, 120,

//each trangle's color

0xff << 16, //red

0xff << 8, //green

0xff << 4, //blue

0xff << 8 | 0xff << 16, //yellow

// flush

Graphics3D.COMMAND_FLUSH, Graphics3D.COMMAND_END };

cmdListPrim_ = cmdListPrim;

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

}