p5.js mouseReleased()函数

p5.js 中的mouseReleased()函数在鼠标按钮释放时起作用。当未定义 mouseReleased()函数时，使用touchEnded()函数代替 mouseReleased()函数。

句法：

mouseReleased(Event)

下面的程序说明了 p5.js 中的 mouseReleased()函数：

示例 1：本示例使用 mouseReleased()函数更改背景颜色。

function setup() {
      
    // Create Canvas
    createCanvas(500, 500);
}
   
let value = 0;
  
function draw() {
      
    // Set the background color
    background(200);
      
    // Fill the color
    fill(value, value-50, value-100);
      
    // Create rectangle
    rect(25, 25, 460, 440);
      
    // Set the filled color
    fill('lightgreen');
      
    // Set the font size
    textSize(15);
      
    // Display result
    text('Keep on Clicking the Mouse Across'
        + ' the page \nto change Canvas Color.',
        windowHeight/10, windowWidth/4);
}
  
function mouseReleased() {
    value = value + 5;
      
    if (value > 255) {
        value = 0;
    }
}

输出：

示例 2：本示例使用 mouseReleased()函数更改鼠标指针颜色。

let valueX;
let valueY;
  
function setup() {
      
    // Create Canvas
    createCanvas(500, 500);
}
   
function draw() {
      
    // Set background color
    background(200); 
      
    // Fill the color
    fill('green');
      
    // Set font size
    textSize(25);
      
    text('Drag mouse to change color', 30, 30);
      
    // Fill color according to mouseMoved() 
    fill(valueX, 255-valueY, 255-valueX);
      
    // Draw ellipse  
    ellipse(mouseX, mouseY, 115, 115);
}
  
function mouseReleased() {
    valueX = mouseX%255;
    valueY = mouseY%255;
}

输出：

参考： https://p5js.org/reference/#/p5/mouseReleased