draw opengl Square - Android android.opengl

Android examples for android.opengl:OpenGL

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Description

draw opengl Square

Demo Code


import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import javax.microedition.khronos.opengles.GL10;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap.Config;
import android.opengl.GLUtils;

public class Main{
    public static final void drawSquare(GL10 gl) {
        drawSquare(gl, 1.f, 0.f, 0.f, 1.f);

    }/*from w w w  .  j  a va 2s. com*/
    public static final void drawSquare(GL10 gl, float r, float g, float b,
            float a) {
        drawSquare(gl, 0.f, 0.f, r, g, b, a);

    }
    public static final void drawSquare(GL10 gl, float x, float y, float r,
            float g, float b, float a) {
        drawRectangle(gl, x, y, 1.f, 1.f, r, g, b, a);

    }
    public static final void drawRectangle(GL10 gl, float x, float y,
            float width, float height, float r, float g, float b, float a) {
        float[] verticies = { -0.5f * width + x, -0.5f * height + y,
                0.5f * width + x, -0.5f * height + y, -0.5f * width + x,
                0.5f * height + y, 0.5f * width + x, 0.5f * height + y, };

        float[] colors = { r, g, b, a, r, g, b, a, r, g, b, a, r, g, b, a, };

        FloatBuffer polygonVerticies = makeFloatBuffer(verticies);
        FloatBuffer polygonColors = makeFloatBuffer(colors);

        gl.glVertexPointer(2, GL10.GL_FLOAT, 0, polygonVerticies);
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glColorPointer(4, GL10.GL_FLOAT, 0, polygonColors);
        gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
        gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);

    }
    public static final FloatBuffer makeFloatBuffer(float[] arr) {
        ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4);
        bb.order(ByteOrder.nativeOrder());
        FloatBuffer fb = bb.asFloatBuffer();
        fb.put(arr);
        fb.position(0);
        return fb;
    }
}

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