Android Open Source - geoar-app Triangle Feature

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 *//from   www .  j  a  v  a2  s  . c o  m
 * 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 org.n52.geoar.view.geoar.gl.mode.features;

import org.n52.geoar.view.geoar.gl.mode.BilligerColorShader;
import org.n52.geoar.view.geoar.gl.mode.RenderFeature2;

import android.opengl.GLES20;
import android.util.FloatMath;

public class TriangleFeature extends RenderFeature2{
  
  final int numBorderPoints = 30;
  
  public TriangleFeature() {
    renderer = BilligerColorShader.getInstance();
    drawingMode = GLES20.GL_TRIANGLE_FAN;
  }

  @Override
  public void setOpenGLPreRenderingSettings() {
    // TODO Auto-generated method stub
    
  }

  @Override
  public void onPreRender() {
    // TODO Auto-generated method stub
    
  }

  @Override
  public void onCreateInGLESThread() {
    
    final int numOfVertices = (numBorderPoints+2) * 3;
    final int numOfColors = (numBorderPoints+2) * 4;
//    final int numOfTexCoords = (numBorderPoints+2) * 2;
    
    final float[] vertices = new float[numOfVertices];
    final float[] colors = new float[numOfColors];
    final float[] normals = new float[numOfVertices];
//    final float[] texCoords = new float[numOfTexCoords];
    
    for (int i = 3, point = 0; i < numOfVertices; i += 3, point++) {
      float radians = (float) Math.toRadians(360.f - point * 360.f / numBorderPoints);
      vertices[i]   = FloatMath.cos(radians);
      vertices[i + 2] = FloatMath.sin(radians);

      normals[i + 1] = 1.0f;
    }
    
    /** set color coordinates - first point is in the middle */
    colors[0] = 1.0f;
    colors[3] = 1.0f;
    for (int i = 4; i < numOfColors; i += 4) {
      colors[i] = 1.0f;
      colors[i + 3] = 0.1f;
    }
    
    setRenderObjectives(vertices, colors, normals, null);
  }

}

Java Source Code List

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