- Processing
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- Processing Foundation

This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.

Name | ### mouseDragged()
Examples |
    // Drag (click and hold) your mouse across the
    // image to change the value of the rectangle

    int value = 0;

    void draw() {
      fill(value);
      rect(25, 25, 50, 50);
    }

    void mouseDragged()
    {
      value = value + 5;
      if (value > 255) {
        value = 0;
      }
    }
Description | The mouseDragged() function is called once every time the mouse moves while a mouse button is pressed. (If a button is not being pressed, mouseMoved() is called instead.) Mouse and keyboard events only work when a program has draw(). Without draw(), the code is only run once and then stops listening for events.
Syntax |
    mouseDragged()
    mouseDragged(event)
Returns | void
Related | mouseX mouseY pmouseX pmouseY mousePressed mousePressed() mouseReleased() mouseClicked() mouseMoved() mouseButton mouseWheel()

Updated on January 9, 2020 00:33:08pm EST