Java GL.glMatrixMode方法代碼示例

import javax.media.opengl.GL; //導入方法依賴的package包/類
private void renderText(GL gl, String text, int x, int y, int font) {
    int viewport[] = new int[4];
    gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);

    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glPushMatrix();
    gl.glLoadIdentity();
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glPushMatrix();
    gl.glLoadIdentity();
    {
        gl.glOrtho(0, viewport[2], 0, viewport[3], -1, 1);
        gl.glColor3d(1, 1, 1);
        gl.glRasterPos3d(0, 0, 0);
        glut.glutBitmapString(font, text);
    }
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glPopMatrix();
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glPopMatrix();
    
}
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
@Override
    public synchronized void init(GLAutoDrawable glDrawable) {
        GL gl = glDrawable.getGL();

        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glLoadIdentity();

        gl.glEnable(GL.GL_DEPTH_TEST);
        gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);

        gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        gl.glClearDepth(1.0);
        gl.glShadeModel(GL.GL_SMOOTH); // try setting this to GL_FLAT and see what happens.

/*        float[] lightAmbient = new float[]{0.5f, 0.5f, 0.5f, 1.0f};
        float[] lightDiffuse = new float[]{1.0f, 1.0f, 1.0f, 1.0f};
        float[] lightPosition = new float[]{
            0, 0, 0,
            //            (float)levelBox.getFlag().getCenterX(),
            //          (float)levelBox.getFlag().getCenterY(),
            //        (float)levelBox.getFlag().getCenterZ() + (float)levelBox.getFlag().getDeltaZ(),
            1.0f};
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_AMBIENT, FloatBuffer.wrap(lightAmbient));
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_DIFFUSE, FloatBuffer.wrap(lightDiffuse));
        gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, FloatBuffer.wrap(lightPosition));
        gl.glEnable(GL.GL_LIGHT0);
  */
        gl.glDisable(GL.GL_LIGHTING);

        // Now preprocess our data for rendering
        agentRenderes.prepare(gl);
        mapRenderer.prepare(gl);
    }
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
/**
 * Set projection, viewpoinbt and so on. Used every rendered frame.
 */
private synchronized void setProjection(GL gl, int x, int y, int width, int height) {
    if (height <= 0) { // avoid a divide by zero error!
        height = 1;
    }
    float h = (float) width / (float) height;
    gl.glViewport(0, 0, width, height);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    glu.gluPerspective(viewpoint.getViewAngle(), h, 10.0, 100000.0);
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();
}
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
/**
 * Clear the screen, set up correct observer position and other stuff
 * @param gl
 */
private synchronized void prepareCanvas(GL gl) {
    // Clear the drawing area
    gl.glEnable(GL.GL_DEPTH_TEST); // GL.GL_NORMALIZE|
    gl.glClearColor(0.45f, 0.45f, 0.45f, 0f);

    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

    // Reset the modelview to the "identity"
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();

    // Move the "drawing cursor" around
    Location observerLoc = viewpoint.getLocation();
    Location eyeLoc = viewpoint.getEye();
    Vector3d upVec = viewpoint.getUp();
    //    gl.glTranslated(observerLocation.x, observerLocation.y, observerLocation.z);
    glu.gluLookAt(
            eyeLoc.x,
            eyeLoc.y,
            eyeLoc.z,
            observerLoc.x,
            observerLoc.y,
            observerLoc.z,
            upVec.x,
            upVec.y,
            upVec.z);

    gl.glScaled (1., 1., -1.);
}
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
/**
 * Set mode according to viewport. 0,0 is at left top
 */
public static void setOrthoViewport(GL gl) {
    Rectangle viewport = getViewport(gl);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    gl.glOrtho(viewport.getMinX(), viewport.getMaxX(), viewport.getMinY(), viewport.getMaxY(), -1, 1);
    gl.glMatrixMode(GL.GL_MODELVIEW);
}
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
public static void pushMatrixMode(GL gl) {
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glPushMatrix();
    gl.glLoadIdentity();
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glPushMatrix();
    gl.glLoadIdentity();
}
 

import javax.media.opengl.GL; //導入方法依賴的package包/類
public static void popMatrixMode(GL gl) {
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glPopMatrix();
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glPopMatrix();
}