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  [Solved] Java is ignoring X co-ord?  (Read 781 times)
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Offline westloar

Junior Devvie





« Posted 2011-06-10 09:56:51 »

Ok so I've finally got my BoxCatcher app working (or so I thought). The idea is that a box object is created and is drawn to the canvas, a mouseListener is set up and when the user clicks the co-ords of the click is checked against the co-ords of the box. If the click is within the box, the score is incremented by one, the box is made 2 pixels smaller and is drawn elsewhere.

The issue is that the box only changes its position on the Y axis, it always stays on at 0 on the X axis no matter how many new boxes are drawn, here's the code for Box:

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public class Box  {
public final int panelHeight;    
public final int panelWidth;
public int boxH;
public int boxW;
public int boxX;
public int boxY;

public Box (int height, int width) {
   
    panelHeight = height; //PHEIGHT and PWIDTH passed from bp
    panelWidth = width;
    boxH =102;
    boxW =102;
   
}
   
    public void add (){
        this.boxH -= 2;
        this.boxW -= 2; //decrease box size by 2 everytime one spawns.
        int newY = (int) (Math.random()*701);
        int newX = (int) (Math.random())*701; //generate a number between 0-700
       
        if (panelHeight - (newY + this.boxH)< 0) {
            newY = panelHeight - this.boxH;}
        if (panelWidth - (newX + this.boxW)< 0) {
            newX = panelWidth - this.boxW;}
       
        this.boxY = newY;
        this.boxX = newX; //set new box co-ords
        }

     public void draw ( Graphics g){
        g.setColor (Color.blue);
        g.fillRect(boxX, boxY, boxW, boxH);
    }

     public boolean hitTarget (int x, int y) {
         return((x>= this.boxX)&&(x<= (this.boxX +this.boxW))&&
                 (y>= this.boxY)&&(y<=this.boxY + this.boxH));

         }//endIf
     }


Could someone tell me where I've gone wrong please?
Offline cylab

JGO Ninja


Medals: 55



« Reply #1 - Posted 2011-06-10 11:24:03 »

Math.random() returns a double between 0 and <1. In your Y code you multiply by 701 and cast the result to an int:
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        int newY = (int) (Math.random()*701);


in your X code you have your brackets wrong:
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        int newX = (int) (Math.random())*701; //generate a number between 0-700


so you cast the random() double to int first and then multiply by 701. Since everything <1 is rounded to 0 when casted to int, you always get 0 as result (0*701=0 Wink

Mathias - I Know What [you] Did Last Summer!
Offline westloar

Junior Devvie





« Reply #2 - Posted 2011-06-10 11:46:00 »

I love simple syntax errors, thanks a bunch Smiley

it works now Smiley

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