CODEWITHSUNDEEP
javaimagecanvasgraphicsdraw
Santiago VdeK
Santiago VdeK

Reputation: 72

How to know if the mouse click is over a graphics image java

I wanted to know if it is possible to know if when I left click my canvas there is an image icon under it, this is the code that must be able to hand that case:

 public void mousePressed(MouseEvent evt) {
    if (!labelSelected){

    // This is called by the system when the user presses the mouse button.
    // Record the location at which the mouse was pressed.  This location
    // is one endpoint of the line that will be drawn when the mouse is
    // released.  This method is part of the MouseLister interface.
    startX = evt.getX();
    startY = evt.getY();
    prevX = startX;
    prevY = startY;
    dragging = true;
    Random ran = new Random();
    int x = ran.nextInt(10);
    currentColorIndex = x;
    gc = getGraphics();  // Get a graphics context for use while drawing.
    gc.setColor(colorList[currentColorIndex]);
    gc.setXORMode(getBackground());
    gc.drawLine(startX, startY, prevX, prevY);
    }
}

but before drawing my line I want to make sure that the mouse is pressed over an graphics image, something like if (evt.getsource() == "Graphics ICON") or something like that.

Upvotes: 1

Views: 1823

Answers (1)

ritesh
ritesh

Reputation: 2265

Try to check with the position of the image, for eg. if Image position is (X=100, Y=100) and width and height is 100. Then you can check with the current position of the cursor. And get the X position, Y position, width and height from the ImageIcon object. Like - 

// imgX has the position of Image in X direction
// imgY has the position of Image in Y direction
// imgW has the width of image
// imgH has the height of image

So now I can check with-

if((startX <= imgX+imgW && startX >= imgX) && (startY <= imgY+imgH && startY >= imgH))
{
   //On the image
}
else
{
  //Out side of the image
}

Upvotes: 1

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