Slick Forums

package pl.shockah.easyslick;

import org.newdawn.slick.Color;
import org.newdawn.slick.SlickException;

public class Image extends org.newdawn.slick.Image {
   protected float cX, cY;
   
   public Image(String path) throws SlickException {
      super(path);
   }
   public Image(int width, int height) throws SlickException {
      super(width,height);
   }
   
   public void draw(float x, float y, float x2, float y2, float srcx, float srcy, float srcx2, float srcy2, Color filter) {
      super.draw(x-cX,y-cY,x2-cX,y2-cY,srcx,srcy,srcx2,srcy2,filter);
   }
   public void draw(float x, float y, float width, float height, Color col) {
      super.draw(x-cX,y-cY,width,height,col);
   }
   public void drawFlash(float x, float y, float width, float height, Color col) {
      super.drawFlash(x-cX,y-cY,width,height,col);
   }
   public void drawSheared(float x, float y, float hshear, float vshear) {
      super.drawSheared(x-cX,y-cY,hshear,vshear);
   }
   
   public void setRotation(float angle) {
      super.setRotation(-angle);
   }
   
   public void setCenterOfRotation(float x, float y) {
      super.setCenterOfRotation(x,y);
      cX = x; cY = y;
   }
   public void center() {
      setCenterOfRotation(getWidth()/2f,getHeight()/2f);
   }
}

package pl.shockah.easyslick.tests;

import org.newdawn.slick.Color;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.geom.Circle;
import pl.shockah.easyslick.EHandler;
import pl.shockah.easyslick.Image;
import pl.shockah.easyslick.MainGame;
import pl.shockah.easyslick.Room;

public class TestCenterOfRotation {
   public static void main(String[] args) {
      MainGame.start(null,new RoomTest(),"Test - centerOfRotation");
   }
   
   public static class RoomTest extends Room {
      private static Image img = null;
      private float angle = 0;
      
      protected void onCreate() {
         img = EHandler.newImage("pngFile2.png");
         img.center();
      }
      
      protected void onTick() {
         angle += 2;
      }
      protected void onRender(Graphics g) {
         img.setRotation(angle);
         img.draw(width/2,height/2);
         
         g.setColor(Color.red);
         g.draw(new Circle(width/2,height/2,3,8));
      }
   }
}

    public static void drawCentered(Image img, GameContainer screen) {
        drawCentered(img, screen, 0, 0);
    }
   
    public static void drawCentered(Image img, GameContainer screen, float x, float y) {
        drawCentered(img, screen.getWidth(), screen.getHeight(), x, y);
    }
   
    public static void drawCentered(Image img, float parentWidth, float parentHeight, float x, float y) {
        img.draw(x + parentWidth/2f-img.getWidth()/2f, y + parentHeight/2f-img.getHeight()/2f);
    }