Android Open Source - diploma-assignment Ballista Arrow

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License

The source code is released under:

MIT License

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Java Source Code

package com.me.battlescreen;
// w ww.  j  a v  a 2 s.  co m
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.utils.TimeUtils;

public class BallistaArrow extends Actor{
  
  private BattleScreen screen;
  
  private float velocity,velocityX,velocityY;
  private float startX,startY;
  private float currX,currY;
  private float angle;
  private float time;
  long startTime;
  private Texture texture;
  private int width,height;
  private int attack;
  
  public BallistaArrow(BattleScreen s,int v,float x, float y,float a,Texture t){
    screen=s;
    texture=t;
    height=(int)(screen.getHeight()*Constants.BALLISTA_ARROW_HEIGHT);
    width=(int) (height*texture.getWidth()/texture.getHeight());
    this.setSize(width, height);
    velocity=v;
    currX=startX=x;
    currY=startY=y;
    angle=a;
    time=0;
    velocityX=(float) (Math.cos(angle*Math.PI/180)*velocity);
    velocityY=(float) (Math.sin(angle*Math.PI/180)*velocity);
    attack=Constants.BALLISTA_DAMAGE;
    startTime=TimeUtils.millis();
  }
  
  @Override
  public void draw(Batch batch,float alpha) {
    // TODO Auto-generated method stub
    calculateCoordinates();
    if(currY<screen.getHeight()-screen.getBg().getHeight()){
      screen.removeArrow(this);
      return;
    }
    batch.draw(texture, currX-screen.getBg().getCoordsX(), currY, 
        this.getWidth()/2,0, this.getWidth(), this.getHeight(), 1, 1,
        angle,0, 0,texture.getWidth(), texture.getHeight(), false, false);
  }
  
  private void calculateCoordinates() {
    // TODO Auto-generated method stub
    time=((float)(TimeUtils.millis()-startTime))/1000;
    float velY=velocityY+Constants.GRAVITY*time;
    float currDisplacementY=velocityY*time+Constants.GRAVITY*time*time/2;
    float currDisplacementX=velocityX*time;
    angle=(float) (Math.atan(velY/velocityX)*180/Math.PI);
    currX=startX+currDisplacementX;
    currY=startY+currDisplacementY;
  }

  public void arrowHit() {
    if(angle<0){
      Vector2 v=new Vector2(this.getWidth(),0);
      v.rotate(angle);
      float x1=currX;
      float y1=currY+this.getHeight()/2;
      float x2=x1+v.x;
      float y2=y1+v.y;
      screen.arrowHit(x1,y1,x2,y2,attack,true);
    }
  }

  
}

Java Source Code List