CODEWITHSUNDEEP
javaprocessing
James Kelleher
James Kelleher

Reputation: 2147

How to check if mouse is over the canvass in Processing 3?

I'd like to write a function that returns true if the mouse is over the canvass, and false if not.

My solution would basically look like this:

import java.awt.MouseInfo;

Point globalMouse;

boolean mouseOverCanvass() {
    globalMouse = MouseInfo.getPointerInfo().getLocation(); 

    boolean mouseInXRange = (canvass.X < globalMouse.X) && (globalMouse.X < canvass.X + width);
    boolean mouseInYRange = (canvass.Y < globalMouse.Y) && (globalMouse.Y < canvass.Y + height);

    if (mouseInXRange && mouseInYRange) {
        return true;
    } else {
        return false;
    }
}

The problem is that I can't find the canvass position. I found this solution to getting the location of the window, but this provides the coordinate including the top bar, whereas I'd like the location of the canvass within that window.

Upvotes: 1

Views: 188

Answers (1)

micycle
micycle

Reputation: 3810

Override the mouseEntered() and mouseExited() methods provided by PApplet, using a boolean variable to keep track of the current mouse-over-canvas state:

boolean mouse_over = false;

@Override
public void mouseEntered() {
    mouse_over = true;
}

@Override
public void mouseExited() {
    mouse_over = false;
}

Upvotes: 3

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