public class dotClass extends GLSurfaceView {
private trangleFan tFan2d;
//0x10000似乎是一個(gè)像素的距離
int one = 0x10000;
int vertex[] = {
one*200, one*200,
one*300, one*500,
};
//為各個(gè)點(diǎn)提供顏色，不知道出了rgb以外的顏色怎么提供
int color[] = {
one, one , one, one,
one, one, 0, one,
};
int triangleColor[] = {
one, 0, 0, one,
0, one, 0, one,
0, 0, one, one,
};
int triangleVertex[] = {
0, 0,
100*one, 0,
50*one, 100*one,
};
public dotClass( Context ctx){
super( ctx );
Init();
}
public dotClass( Context ctx, AttributeSet attrs){
super( ctx, attrs );
Init();
}
//
private void Init(){
tFan2d=new trangleFan( triangleVertex, triangleColor );
this.setRenderer( renderer );
}
GLSurfaceView.Renderer renderer=new Renderer(){
@Override
public void onDrawFrame(GL10 gl) {
// TODO Auto-generated method stub
gl.glClear( GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT );
drawLine(gl, vertex, color, 5);
drawPoint(gl, vertex, color, 20);
// tFan.draw( gl );
tFan2d.draw(gl);
// tStrip.draw(gl);
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
// TODO Auto-generated method stub
//首先是opengl可用的空間 ：
gl.glViewport( 0, 0, width/2, height/2 );
//這個(gè)matrix是如何把三維坐標(biāo)轉(zhuǎn)換為二維坐標(biāo)并把它放在顯示器上。
gl.glMatrixMode( GL10.GL_PROJECTION );
//告訴opengl初始化這個(gè)matrix。
gl.glLoadIdentity();
GLU.gluOrtho2D( gl, 0.0f, width, 0.0f, height );
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
// TODO Auto-generated method stub
//設(shè)置北京顏色
gl.glClearColor( 0.0f, 1.0f, 1.0f, 0.0f ); //
gl.glShadeModel( GL10.GL_FLAT ); //
gl.glHint( GL10.GL_POINT_SMOOTH_HINT, GL10.GL_FASTEST ); //
//使gl可以接受位置數(shù)組
gl.glEnableClientState( GL10.GL_VERTEX_ARRAY ); //set for array as vertex
//使gl可以接受顏色數(shù)組
gl.glEnableClientState( GL10.GL_COLOR_ARRAY ); //set for array as color
gl.glDisable( GL10.GL_TEXTURE_2D ); //no 2
}
};
//將int數(shù)組轉(zhuǎn)化成inbuff類型，為glVertexPointer，glColorPointer方法用
private IntBuffer getIntBuffer( int[] table ) {
ByteBuffer bb = ByteBuffer.allocateDirect( table.length * 4 );
bb.order( ByteOrder.nativeOrder() );
IntBuffer ib = bb.asIntBuffer();
ib.put( table );
ib.position( 0 );
return ib;
}
private void drawPoint( GL10 gl, int[] vertex, int[] color, int size ){
//gl的大小，也就是下邊的點(diǎn)的尺寸
gl.glPointSize(size );
//vertex數(shù)組里存的坐標(biāo)，這里的2代表2維，就是數(shù)組里面的數(shù)字2個(gè)位一族表示一個(gè)點(diǎn)的位置。需要裝成buff
gl.glVertexPointer( 2, GL10.GL_FIXED, 0, getIntBuffer( vertex ) );
//color數(shù)組里面存儲(chǔ)的點(diǎn)的顏色，這里的4代表RGBA類型顏色。也需要妝化成buff
gl.glColorPointer( 4, GL10.GL_FIXED, 0, getIntBuffer( color ) );
//告訴gl畫什么圖形，這里的2代表畫多少個(gè)點(diǎn)，及數(shù)組里面包含多少個(gè)點(diǎn)
gl.glDrawArrays( GL10.GL_POINTS, 0, 2 );
}
private void drawLine( GL10 gl, int[] vertex, int[] color, int size ){
gl.glLineWidth( size ); //set line width
gl.glVertexPointer( 2, GL10.GL_FIXED, 0, getIntBuffer( vertex ) ); //set vertex points
gl.glColorPointer( 4, GL10.GL_FIXED, 0, getIntBuffer( color ) ); //set color points
gl.glDrawArrays( GL10.GL_LINES, 0, 1*2 ); //mode is GL_LINES
}
class trangleFan{
private IntBuffer vertexBuff = null;
private IntBuffer colorBuff = null;
private int pointNum;
public trangleFan( int vertex[], int color[] ){
if( vertex != null ){
vertexBuff = getIntBuffer( vertex );
pointNum = vertex.length / 2;
}
if( color != null ){
colorBuff = getIntBuffer( color );
}
}
public void draw( GL10 gl ){
if( vertexBuff != null ){
gl.glVertexPointer( 2, GL10.GL_FIXED, 0, vertexBuff );
gl.glColorPointer( 4, GL10.GL_FIXED, 0, colorBuff );
gl.glDrawArrays( GL10.GL_TRIANGLES, 0, pointNum );
}
}
}
}
http://code.google.com/p/linuxgraphicsweb/source/browse/trunk/Pages/android/gallery3d_glsurfaceview.muse?spec=svn176&r=176