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Reference for Processing (BETA) version 0135+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name

### mouseButton

Examples

    // Click within the image and press
    // the left and right mouse buttons to
    // change the value of the rectangle
    void draw() {
      if (mousePressed && (mouseButton == LEFT)) {
        fill(0);
      } else if (mousePressed && (mouseButton == RIGHT)) {
        fill(255);
      } else {
        fill(126);
      }
      rect(25, 25, 50, 50);
    }

    // Click within the image and press
    // the left and right mouse buttons to
    // change the value of the rectangle
    void draw() {
      rect(25, 25, 50, 50);
    }

    void mousePressed() {
      if (mouseButton == LEFT) {
        fill(0);
      } else if (mouseButton == RIGHT) {
        fill(255);
      } else {
        fill(126);
      }
    }

Description | Processing automatically tracks if the mouse button is pressed and which button is pressed. The value of the system variable mouseButton is either LEFT, RIGHT, or CENTER depending on which button is pressed.

Parameters

Usage | Web & Application
Related | mouseX mouseY mousePressed() mouseReleased() mouseMoved() mouseDragged()

Updated on February 09, 2008 04:38:52pm PST