Android Open Source - NotATop Line

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Back to project page NotATop.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.gg.util;
//from w w w .j  av  a  2 s. c o m
/*    ????????????    */
public class Line {

  private Point firstPoint;
  private Point secondPoint;
  
  private Direction direction;
  private float k;
  private float b;

  public Line(){
    
  }
  
  public Line(Point first, Point second){
    firstPoint = first;
    secondPoint = second;
    
    direction = calculateDirection(firstPoint, secondPoint);
    
    k = (secondPoint.y-firstPoint.y) / (secondPoint.x-firstPoint.x);
    b = firstPoint.y - k*firstPoint.x;
  }
  
  public Line(float x1, float y1, float x2, float y2){
    this(new Point(x1, y1, 0f), new Point(x2, y2, 0f));
  }

  
  /*    ?????get(),set()    */
  public Point getFirstPoint() {
    return firstPoint;
  }

  public void setFirstPoint(Point firstPoint) {
    this.firstPoint = firstPoint;
  }

  public Point getSecondPoint() {  
    return secondPoint;  
  }

  public void setSecondPoint(Point secondPoint) {
    this.secondPoint = secondPoint;
  }

  public Direction getDirection() {
    return direction;
  }

  public void setDirection(Direction direction) {
    this.direction = direction;
  }
  
  public float getB() {
    return b;
  }

  public void setB(float b) {
    this.b = b;
  }

  public float getK() {
    return k;
  }

  public void setK(float k) {
    this.k = k;
  }

  

  public Direction calculateDirection(Point firstPoint, Point secondPoint){
    if(secondPoint.x > firstPoint.x){
      if(secondPoint.y > firstPoint.y){
        return new Direction(Direction.UP_RIGHT);
      }else if(secondPoint.y < firstPoint.y){
        return new Direction(Direction.DOWN_RIGHT);
      }else{
        return new Direction(Direction.RIGHT);
      }
    }else if(secondPoint.x < firstPoint.x){
      if(secondPoint.y > firstPoint.y){
        return new Direction(Direction.UP_LEFT);
      }else if(secondPoint.y < firstPoint.y){
        return new Direction(Direction.DOWN_LEFT);
      }else{
        return new Direction(Direction.LEFT);
      }
    }else{
      if(secondPoint.y > firstPoint.y){
        return new Direction(Direction.UP);
      }else{
        return new Direction(Direction.DOWN);
      }
    }
  }

  
  public boolean isCollideCircle(Circle circle){
    float r = circle.getRadius();
    float distance = distanceCircle(circle);
    
    if(distance > r){
      return false;
    }else if(distance == r){
      return true;
    }else{  
      return true;

    }
  }
  
  
  public float distanceCircle(Circle circle){
    float x0 = circle.getCenter().x;
    float y0 = circle.getCenter().y;
    return (float) (Math.abs(y0-k*x0-b) / Math.sqrt(1+k*k));
  }
  
  
  public Direction directionCircle(Circle circle){
    float x0 = circle.getCenter().x;
    float y0 = circle.getCenter().y;
    float circleB = y0 - k*x0;
    
    if(circleB>b){
      return new Direction(Direction.DOWN);
    }else if(circleB<b){
      return new Direction(Direction.UP);
    }else{
      return new Direction(Direction.RIGHT);
    }
  }
  
}

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