Mouse Press

/**
 * Mouse Press. 
 * 
 * Move the mouse to position the shape. 
 * Press the mouse button to invert the color. 
 */

void setup() {
    size(640, 360);
    noSmooth();
    fill(126);
    background(102);
}

void draw() {
    if (_mousePressed) {
        stroke(255);
    } else {
        stroke(0);
    }

    line(mouseX - 66, mouseY, mouseX + 66, mouseY);
    line(mouseX, mouseY - 66, mouseX, mouseY + 66); 
}