Android Open Source - TreeFrogEngine Directional

From Project

Back to project page TreeFrogEngine.

License

The source code is released under:

MIT License

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Java Source Code

package com.discretesoftworks.framework;
//w  w  w. java  2 s . c  o m
import java.util.ArrayList;

// Holds calculations that may be used by any class.
public abstract class Directional {

  // Gets the x-length of a total length in a given direction.
  public static float lengthDirX(float dir, float dist){
    return (float) Math.sin(Math.toRadians(-dir))*dist;
  }
  
  // Gets the y-length of a total length in a given direction.
  public static float lengthDirY(float dir, float dist){
    return (float) Math.cos(Math.toRadians(-dir))*dist;
  }
  
  // Gets the distance between two points.
  public static float pointDistance(float x1, float y1, float x2, float y2){
    float dx = x2-x1;
    float dy = y2-y1;
    return (float)Math.sqrt(dx*dx + dy*dy);
  }
  
  // Get the direction (in degrees) between two points.
  public static float pointDirection(float x1, float y1, float x2, float y2){
    float axisX = x2-x1;
    float axisY = y2-y1;
    float dir = (float) Math.toDegrees( Math.atan2(-axisX, axisY) );
    return dir;
  }
  
  // Checks collisions between object a and the list of objects b
  // Returns what object a collided with, null if there is no collision
  public static GriddedObject checkAllCollisions(GriddedObject a, ArrayList<GriddedObject> b){
    for (int i = 0; i < b.size(); i++)
      if (checkCollision(a,b.get(i)))
        return b.get(i);
    return null;
  }
  
  // Checks for a collision between object a and object b
  // Returns whether or not there was a collision
  public static boolean checkCollision(GriddedObject a, GriddedObject b){
    int xdist = Math.abs((int)(b.getX() - a.getX()));
    int ydist = Math.abs((int)(b.getY() - a.getY()));
    if ((xdist < a.getWidth()/2+b.getWidth()/2) && (ydist < a.getLength()/2+b.getLength()/2))
      return true;
    return false;
  }
  
}

Java Source Code List