Android Open Source - DivisionByZero Line Guide

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Back to project page DivisionByZero.

License

The source code is released under:

Apache License

Java Source Code

package com.ggstudios.divisionbyzero;
//from w  w  w.  j a v a2 s. c o m
import com.ggstudios.utils.BufferUtils;

import android.opengl.GLES20;

import static fix.android.opengl.GLES20.glVertexAttribPointer;

public class LineGuide extends Drawable{
  
  private float x, y;
  private int horizontalHandle, verticalHandle;
  private int textureHandle;
  
  private boolean isVisible = true;
  
  public LineGuide() {
    setupBuffers();
  }
  
  private void setupBuffers() {
    final float lineWidth = Core.SDP * 0.05f;
    final float horizontalVertices[] = {
        0,   0,   //Vertex 0
        lineWidth, 0,
        0,   Core.canvasHeight,   //v1
        lineWidth, Core.canvasHeight
    };
    final float verticalVertices[] = {
        0,   0,   //Vertex 0
        Core.canvasWidth,   0,   //v1
        0,   lineWidth,
        Core.canvasWidth,   lineWidth,
    };

    horizontalHandle = BufferUtils.copyToBuffer(horizontalVertices);
    verticalHandle = BufferUtils.copyToBuffer(verticalVertices);
    
    textureHandle = Core.tm.get(R.drawable.white);
  }

  public void setXY(float x, float y) {
    this.x = x;
    this.y = y;
  }
  
  public void hide() {
    isVisible = false;
  }
  
  public void show() {
    isVisible = true;
  }

  @Override
  public void draw(float offX, float offY) {
    if (!isVisible) return;
    
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle);

    GLES20.glUniform4f(Core.U_TEX_COLOR_HANDLE, 1f, 0f, 0f, 1f);

    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, horizontalHandle);
    glVertexAttribPointer(Core.A_POSITION_HANDLE, 2, GLES20.GL_FLOAT, false, 0, 0); 
    
    Utils.resetMatrix();
    Utils.translateAndCommit(x, 0);
    GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
    
    GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, verticalHandle);
    glVertexAttribPointer(Core.A_POSITION_HANDLE, 2, GLES20.GL_FLOAT, false, 0, 0); 
    
    Utils.translateAndCommit(-x, y);
    GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);

    GLES20.glUniform4f(Core.U_TEX_COLOR_HANDLE, 1, 1, 1, 1);
  }

  @Override
  public void refresh() {
    setupBuffers();
  }

}

Java Source Code List

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