gestures

What is the difference between Pan and Swipe in iOS?

由 烈酒焚心 提交于 2019-11-26 07:58:24
问题 Sounds simple .. Hold the Trackpad, move the finger, release .. But somehow swipe is not being triggered (pan is triggered instead) UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:v action:@selector(handleSwipe:)]; swipeGesture.direction= UISwipeGestureRecognizerDirectionUp; [v addGestureRecognizer:swipeGesture]; Pan is recognized by the above sequence instead. UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:v

Draw on HTML5 Canvas using a mouse

由 痴心易碎 提交于 2019-11-26 00:50:13
问题 I want to draw on an HTML Canvas using a mouse (ex: draw a signature, draw a name,...) Please help me how can I do? Please give some source code. Thank you 回答1: Here is a working sample. <html> <script type="text/javascript"> var canvas, ctx, flag = false, prevX = 0, currX = 0, prevY = 0, currY = 0, dot_flag = false; var x = "black", y = 2; function init() { canvas = document.getElementById('can'); ctx = canvas.getContext("2d"); w = canvas.width; h = canvas.height; canvas.addEventListener(

Draw on HTML5 Canvas using a mouse

由 a 夏天 提交于 2019-11-25 20:16:18
I want to draw on an HTML Canvas using a mouse (ex: draw a signature, draw a name,...) Please help me how can I do? Please give some source code. Thank you user1083202 Here is a working sample. <html> <script type="text/javascript"> var canvas, ctx, flag = false, prevX = 0, currX = 0, prevY = 0, currY = 0, dot_flag = false; var x = "black", y = 2; function init() { canvas = document.getElementById('can'); ctx = canvas.getContext("2d"); w = canvas.width; h = canvas.height; canvas.addEventListener("mousemove", function (e) { findxy('move', e) }, false); canvas.addEventListener("mousedown",
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