mouseDragged()

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.

Related

• mouseX
• mouseY
• pmouseX
• pmouseY
• mousePressed
• mousePressed()
• mouseReleased()
• mouseClicked()
• mouseMoved()
• mouseButton
• mouseWheel()

Example

// 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;
  }
}