p5.js 图片 getCurrentFrame() 方法
p5.js 库中p5.Image的getCurrentFrame()方法用于返回 GIF 动画当前显示帧的索引。
句法:
getCurrentFrame()
参数:这个函数accept不接受任何参数。
返回值:此方法返回一个数字,表示当前可见动画的当前帧。
在实现以下示例时,以下库包含在 HTML 页面的“head”部分中。
示例 1:下面的示例说明了p5.js库中的getCurrentFrame()方法。
Javascript
function setup() {
example_gif =
loadImage("sample-gif.gif");
createCanvas(500, 300);
textSize(18);
incSpeedBtn =
createButton("Increase GIF Speed");
incSpeedBtn.position(30, 240);
incSpeedBtn.mousePressed(() => {
// Decrease the delay between frames
example_gif.delay(25);
})
decSpeedBtn =
createButton("Decrease GIF Speed");
decSpeedBtn.position(200, 240);
decSpeedBtn.mousePressed(() =>
{
// Increase the delay between frames
example_gif.delay(150);
})
}
function draw()
{
clear();
text("The current frame is shown " +
"using getCurrentFrame()", 20, 20);
// Draw the GIF on screen
image(example_gif, 20, 40, 260, 140);
// Get the current frame
let currFrame =
example_gif.getCurrentFrame();
text("The current frame is: " +
currFrame, 20, 200);
}
Javascript
function preload() {
example_gif =
loadImage("sample-gif.gif");
}
function setup() {
createCanvas(500, 300);
textSize(18);
text("Click on the button to get " +
"the current frame", 20, 20);
frameBtn =
createButton("Get current frame");
frameBtn.position(30, 40);
frameBtn.mousePressed(getFrame);
}
function draw() {
// Draw the GIF on screen
image(example_gif, 20, 60, 240, 120);
}
function getFrame()
{
clear();
// Get the current frame
let currFrame =
example_gif.getCurrentFrame();
text("The current frame is: " +
currFrame, 20, 200);
text("Click on the button to get " +
"the current frame", 20, 20);
}
输出:
示例 2:
Javascript
function preload() {
example_gif =
loadImage("sample-gif.gif");
}
function setup() {
createCanvas(500, 300);
textSize(18);
text("Click on the button to get " +
"the current frame", 20, 20);
frameBtn =
createButton("Get current frame");
frameBtn.position(30, 40);
frameBtn.mousePressed(getFrame);
}
function draw() {
// Draw the GIF on screen
image(example_gif, 20, 60, 240, 120);
}
function getFrame()
{
clear();
// Get the current frame
let currFrame =
example_gif.getCurrentFrame();
text("The current frame is: " +
currFrame, 20, 200);
text("Click on the button to get " +
"the current frame", 20, 20);
}
输出:
在线编辑器: https://editor.p5js.org/
环境设置: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
参考: https://p5js.org/reference/#/p5.Image/getCurrentFrame