Android Open Source - 4est Geom

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.geometry;
/*from  w w  w.  j a va 2 s  . c  o m*/
import java.util.Arrays;

/**
 * miscellaneous operations
 */
public class Geom {

  /**
   * load orientation vectors into a 4x4 matrix
   * all vectors should be normalized!
   */
  public static void loadMatrix(float[] m, Vector front, Vector up, Vector right) {
    Arrays.fill(m, 0);
    m[0] = right.x;
    m[1] = right.y;
    m[2] = right.z;
    m[4] = up.x;
    m[5] = up.y;
    m[6] = up.z;
    m[8] = front.x;
    m[9] = front.y;
    m[10] = front.z;
    m[15] = 1;
  }

  /**
   * copies rotation components from 4x4 matrix to 3x3 matrix
   */
  public static void copyM4To3(float[] m3, float[] m4) {
    int i3 = 0, i4 = 0;
    
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
    i4++;
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
    i4++;
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
    m3[i3++] = m4[i4++];
  }
  
  /**
   * tests intersection between two squares
   */
  public static boolean squaresIntersect(float x0, float y0, float l0, float x1, float y1, float l1) {
    return   (x0 < (x1 + l1) && (x0 + l0) > x1) && 
        (y0 < (y1 - l1) && (y0 - l0) > y1);
  }
  
  /**
   * returns true if point in square
   * note that sx, sy is the CORNER point
   */
  public static boolean pointInSquare(float x, float y, float sx, float sy, float sl) {
    return (x >= sx) && (x <= (sx + sl)) && (y >= sy) && (sy <= (sy + sl));
  }
}

Java Source Code List