Android Open Source - splott Pattern

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.pattern;
/*from w w w . java 2s. c o m*/

/**
 * classes and interfaces that generalize pattern generation 
 */
public class Pattern {
  
  /*
   * interfaces for real-valued functions
   */
  
  public interface F1F {
    public float get(float x);
  }

  public interface F2F {
    public float get(float x, float y);
  }
  
  public interface F3F {
    public float get(float x, float y, float z);
  }

  /*
   * interfaces for integer-valued functions
   */
  
  public interface I1F {
    public float get(int x);
  }

  public interface I2F {
    public float get(int x, int y);
  }
  
  public interface I3F {
    public float get(int x, int y, int z);
  }
  
  public interface I2I {
    public int get(int x, int y);
  }
  
  /**
   * cosine interpolation between two points
   */
  public static float cerp(float y0, float y1, float mu) {
    float m2 = (float)(1 - Math.cos(mu * Math.PI)) * 0.5f;
    return (1 - m2) * y0 + m2 * y1;
  }
  
  /**
   * cosine interpolation of I2F function
   */
  public static float ipolate(I2F f, float x, float y) {
    int ix = (int)Math.floor(x);
    float fx = x - ix;
    if (fx < 0) {
      fx += 1;
    }
    
    int iy = (int)Math.floor(y);
    float fy = y - iy;
    if (fy < 0) {
      fy += 1;
    }
    
    float s0 = f.get(ix, iy);
    float s1 = f.get(ix + 1, iy);
    float s2 = f.get(ix, iy + 1);
    float s3 = f.get(ix + 1, iy + 1);
    
    float s01 = cerp(s0, s1, fx);
    float s23 = cerp(s2, s3, fx);
    return cerp(s01, s23, fy);
  }
  
}

Java Source Code List