Android example source code file (MatrixGrabber.java)

This example Android source code file (MatrixGrabber.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

matrixgrabber, matrixtrackinggl

The MatrixGrabber.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics.spritetext;

import javax.microedition.khronos.opengles.GL10;

class MatrixGrabber {
    public MatrixGrabber() {
        mModelView = new float[16];
        mProjection = new float[16];
    }

    /**
     * Record the current modelView and projection matrix state.
     * Has the side effect of setting the current matrix state to GL_MODELVIEW
     * @param gl
     */
    public void getCurrentState(GL10 gl) {
        getCurrentProjection(gl);
        getCurrentModelView(gl);
    }

    /**
     * Record the current modelView matrix state. Has the side effect of
     * setting the current matrix state to GL_MODELVIEW
     * @param gl
     */
    public void getCurrentModelView(GL10 gl) {
        getMatrix(gl, GL10.GL_MODELVIEW, mModelView);
    }

    /**
     * Record the current projection matrix state. Has the side effect of
     * setting the current matrix state to GL_PROJECTION
     * @param gl
     */
    public void getCurrentProjection(GL10 gl) {
        getMatrix(gl, GL10.GL_PROJECTION, mProjection);
    }

    private void getMatrix(GL10 gl, int mode, float[] mat) {
        MatrixTrackingGL gl2 = (MatrixTrackingGL) gl;
        gl2.glMatrixMode(mode);
        gl2.getMatrix(mat, 0);
    }

    public float[] mModelView;
    public float[] mProjection;
}