p5.js: 绘图工具在移动设备上运行不佳
p5.js: Drawing tool doesn't work well on mobile devices
对于一个项目,我想使用这个代码:
let colors;
let color;
function setup() {
let c = createCanvas(windowWidth, windowHeight);
colors = [[155, 204, 250], [205, 104, 200], [255, 0, 0], [0, 255, 0], [0, 0, 255]];
color = random(colors);
}
function mouseClicked() {
color = random(colors);
}
function mouseMoved() {
stroke(...color);
strokeWeight(20);
line(mouseX, mouseY, pmouseX, pmouseY);
return false;
}
<script src="https://cdn.jsdelivr.net/npm/p5@1.4.0/lib/p5.js"></script>
我意识到它在移动设备上运行不佳。有时什么都没有画,有时我会得到一些彩色点。应该可以用手指“正常”画画。
有办法解决吗?非常感谢您的帮助! <3
这不能作为 Whosebug 上的可运行代码段使用,因为它们不会显示在移动设备上,但你可以 (runnable version on OpenProcessing):
let colors;
let color;
function setup() {
createCanvas(windowWidth, windowHeight);
colors = [
[155, 204, 250],
[205, 104, 200],
[255, 0, 0],
[0, 255, 0],
[0, 0, 255]
];
color = random(colors);
}
function isTouchDevice() {
return (('ontouchstart' in window) ||
(navigator.maxTouchPoints > 0) ||
(navigator.msMaxTouchPoints > 0));
}
if (isTouchDevice()) {
let previousTouches;
touchStarted = function(e) {
// Note: when touching multiple times this will reset the color for all of the lines.
color = random(colors);
previousTouches = [...touches];
}
touchMoved = function(e) {
if (previousTouches) {
for (let i = 0; i < touches.length && i < previousTouches.length; i++) {
let prev = previousTouches[i];
let touch = touches[i];
stroke(...color);
strokeWeight(20);
line(prev.x, prev.y, touch.x, touch.y);
}
previousTouches = [...touches];
}
// Prevent zooming and scrolling gestures
e.preventDefault();
return false;
}
touchEnded = function(e) {
previousTouches = [...touches];
}
} else {
mousePressed = function() {
color = random(colors);
}
mouseDragged = function() {
stroke(...color);
strokeWeight(20);
line(mouseX, mouseY, pmouseX, pmouseY);
return false;
}
}
有关详细信息,请参阅 p5.js 参考的 Events - Touch 部分。
对于一个项目,我想使用这个代码:
let colors;
let color;
function setup() {
let c = createCanvas(windowWidth, windowHeight);
colors = [[155, 204, 250], [205, 104, 200], [255, 0, 0], [0, 255, 0], [0, 0, 255]];
color = random(colors);
}
function mouseClicked() {
color = random(colors);
}
function mouseMoved() {
stroke(...color);
strokeWeight(20);
line(mouseX, mouseY, pmouseX, pmouseY);
return false;
}
<script src="https://cdn.jsdelivr.net/npm/p5@1.4.0/lib/p5.js"></script>
我意识到它在移动设备上运行不佳。有时什么都没有画,有时我会得到一些彩色点。应该可以用手指“正常”画画。
有办法解决吗?非常感谢您的帮助! <3
这不能作为 Whosebug 上的可运行代码段使用,因为它们不会显示在移动设备上,但你可以 (runnable version on OpenProcessing):
let colors;
let color;
function setup() {
createCanvas(windowWidth, windowHeight);
colors = [
[155, 204, 250],
[205, 104, 200],
[255, 0, 0],
[0, 255, 0],
[0, 0, 255]
];
color = random(colors);
}
function isTouchDevice() {
return (('ontouchstart' in window) ||
(navigator.maxTouchPoints > 0) ||
(navigator.msMaxTouchPoints > 0));
}
if (isTouchDevice()) {
let previousTouches;
touchStarted = function(e) {
// Note: when touching multiple times this will reset the color for all of the lines.
color = random(colors);
previousTouches = [...touches];
}
touchMoved = function(e) {
if (previousTouches) {
for (let i = 0; i < touches.length && i < previousTouches.length; i++) {
let prev = previousTouches[i];
let touch = touches[i];
stroke(...color);
strokeWeight(20);
line(prev.x, prev.y, touch.x, touch.y);
}
previousTouches = [...touches];
}
// Prevent zooming and scrolling gestures
e.preventDefault();
return false;
}
touchEnded = function(e) {
previousTouches = [...touches];
}
} else {
mousePressed = function() {
color = random(colors);
}
mouseDragged = function() {
stroke(...color);
strokeWeight(20);
line(mouseX, mouseY, pmouseX, pmouseY);
return false;
}
}
有关详细信息,请参阅 p5.js 参考的 Events - Touch 部分。