touch event in html5 canvas

length > 1 || (evt. This technology opens up the opportunity to write a few apps in the cloud that normally would have required a native application, such as signature / initial capturing or sketch recognition style input. context.beginPath(); This example demonstrates: ... Placement of HTML form elements over a canvas element; Multi-touch Fingerpainting. In this article, we explain the touch events in a Windows 8 Metro application with the help of HTML 5 and JavaScript. Let’s take a look at the built in canvas API. This article explores essential techniques for handling user interaction in HTML Canvas-based games. When the user puts the mouse down or starts touching the canvas, we want to prepare the context for the line they are about to draw. Let’s take all this knowledge and put it together in some Javascript. Now let’s look at some code so we can visualize this API. It was only recently that we gained the ability to handle “touch” events from a mobile device on a web-based application. Note: The touchend event will only work on devices with a touch screen. Here, we present a simple example which contains different points. function init() { It moves vertically when the screen is vertical and horizontally when horizontal. Nov 30, 2016. This is just a simple example that responds to both touch and mouse events to draw a line on the HTML 5 canvas screen. I am trying to make a touch event for an iOS mobile with the HTML5 Canvas color wheel, but can't get it work. context.stroke(); Welcome to the first tutorial of ‘HTML5 Canvas Game Development’! String toDataUrl(String type); Context getContext(String … This article explores essential techniques for handling user interaction in HTML Canvas-based games. event.preventDefault(); }. In the next lesson, you'll learn how to detect touch events for platforms like the iPad, iPhone or other touch-enabled devices. When stepping into the world of HTML5 games, it's easy to underestimate the complexity of managing keyboard, mouse, and touch-based input. The moveTo method on the context tells it where we want to start the drawing, and we must manually tell it where we want to start at. To bind event handlers to shapes on a mobile device with Konva, we can use the on() method.The on() method requires an event type and a function to be executed when the event occurs.Konva supports tou. function getTouchPos(e) { if (!e) var e = event; if(e.touches) { if (e.touches.length == 1) { // Only deal with one finger var touch = e.touches[0]; // Get the information for finger #1 touchX=touch.pageX-touch.target.offsetLeft; touchY=touch.pageY-touch.target.offsetTop; } } } // Set-up the canvas and add our event handlers after the page has loaded function init() { // Get the specific … Raw. ... How to add a touch event to the HTML5 Canvas color wheel? The actual event API for touch-enabled browsers vs desktop browsers is outside the scope of this post, but feel free to dive into the details. For example, nearly anyfast-paced game requires the player to press multiple buttons at once, which,in the context of a touchscreen, implies multi-touch. length > 0)) return; var newEvt = document. canvas.addEventListener("mousedown",start,false); Since the user has started drawing on the canvas, we set our isDrawing flag to true. You register event listeners with HTML elements and implement code that responds to those events. Finally, we call stroke() to tell the context to actually paint those lines we drew with some pixels. To allow touch to flow smoothly over the canvas on iOS, prevent the default panning behavior by adding preventDefault() to your touchstart event handler. Touch Events example. I'm using WP version 8.10.12382.878. Let’s dive into how we can use the HTML5 canvas element to capture the user’s touch events. These events are touchstart, 1.6.1. Finally, the event.preventDefault() method’s main responsibility is to prevent touch enabled browsers from capturing our touches and scrolling the users view. Copy link to clipboard. event.preventDefault(); return event.pageX; Single-touch events. The first Clear button is used to clear the canvas. HTML5 applications are event driven. Using the application: The two items on top with small and big circle can be used to change the brush size. function start(event) { Feel free to view the source and see how easy it is to capture the user’s drawing events. can be used to get the X and Y coordinates of the touch: canvas_x = event.targetTouches[0].pageX; To allow touch to flow smoothly over the canvas on iOS, prevent the default panning behavior by adding preventDefault() to your touchstart event handler. function getX(event) { }. You can see the effects of each in the illustration below. Some time back I had to develop an HTML5 customer input form which also included a signature. As I mentioned above, Jeff created some code in his own component to determine where a touch event occurred on the screen relative to the canvas. simulating scrolling behavior in HTML5 canvas with touch events I have an animation in HTML5 Canvas that simulates scrolling when the user clicks and drags. // Set up touch events for mobile, etc canvas. createEvent ("MouseEvents"); var type = null; var touch = null; switch (evt. The final property, strokeStyle, is simply the desired CSS color of the line stroke. Let’s dive into how we can use the HTML5 canvas element to capture the user’s touch events. context.stroke(); simulating scrolling behavior in HTML5 canvas with touch events With the widespread adoption of touchscreen devices, HTML5 brings to the table, among many other things, a set of touch-based interaction events. The first of these I would also be thankful if you can guide me on how to fix them. Apple introduced their touchevents API in iOS 2.0. canvas.addEventListener("mouseup",stop,false); For the sake of readability, I am registering the events in an init() method, and calling this method from the beginning of our constructor. This opens up a whole new door for creating that “native” feel in our web applications. This method tells the context object we are about to give you something to draw. canvas.addEventListener("touchmove",draw,false); Asthe mobile web evolves to enable increasingly sophisticated applications, webdevelopers need a way to handle these events. Since we want our user to be able to interact with the canvas, instead of just randomly executing javascript methods, we need to be able to capture the browser events that tell us the user is interacting with the canvas. }. It demonstrates the usage of html5 canvas. Learn how to handle keyboard and mouse events, how to defeat the web browser's default event behaviors, and how to broadcast events to a … canvas.addEventListener("mousemove",draw,false); The options are butt, round, and square. To understand how to capture touch events and translate them onto the canvas element, we must first understand how to use the canvas element. . Touch and mouse events are slightly different, but when handled correctly you can make a good interface that works with both. This is just a very basic example of what is needed to get this feature working on both. 1.6. var isDrawing = false; All rights reserved. function draw(event) { 2. We can then use the moveTo() method to tell it where to start the drawing at. The two lines that get a reference to the canvas and add the listener are these: var canvas = document.getElementById("canvas_1"); The context object has 5 methods and 4 attributes that are used for marking on the canvas element. You just need to know that getting the x and y coordinates from the two types of events are different, and the following snippet shows how. if(isDrawing) { You can see in the figure below that we are going to pass in the reference to our canvas element that we obtained earlier from its ID. This is where we register each of the methods discussed in the previous section. These events are touchstart, touchend, touchcancel, touchleave, touchmove. I have an animation in HTML5 Canvas that simulates scrolling when the user clicks and drags. }. event.preventDefault(); clientY}); canvas. To understand how to capture touch events and translate them onto the canvas element, we must first understand how to use the canvas element. Touch Events not registering for HTML5 Canvas Authoring using Flash CC Tag: javascript , html5 , flash , canvas , createjs I have been having some issues when it comes to authoring HTML 5 Canvas in Flash CC, mostly as a result of the lack of information on writing JavaScript inside Flash. Example of using HTML5 canvas with both mouse and (single) touch input. The lineCap tells the context how the end of the lines should look. The touch-action: none property will ... To draw on the canvas using mouse movements or swipe actions, we need to add event listener to the canvas. There are two sets of relevant browser events we will look at, the desktop events and the touchscreen (mobile device) events. The isDrawing flag will be used in our drawing methods to determine whether our user is in the process of drawing on the canvas or not. Event Handling. The three available options are miter, round, and bevel. Mouse Events Now let’s talk about the context objects API and how we can use it to draw on the canvas. theCanvas.height = window.innerHeight; You can see in our HTML, we have simply declared a canvas element and given it some fallback text for older browsers that do not support it. I have tried to make a simple HTML5 canvas drawing script. These events are touchstart, touchend, touchcancel, touchleave, touchmove. To see a slightly embellished working copy of this code, visit http://canvas.sjmorrow.com on your mobile device. Definition and Usage. Tuesday, June 10, 2014 … And lastly, when the user removes their finger from the touch screen or releases the mouse button, we want to stop drawing on the canvas. We then call the beginPath() method on the canvas’s context, which tells it we are about to draw something. canvas.addEventListener("touchstart", doTouchStart, false); The touch event is more complex to capture than the mouse event. We simply check the “isDrawing” flag to make sure the user actually clicked the mouse, or put their finger down, and then draw a line on the canvas to that point and stroke the line for the user to see. In each point, we have to display the different touch events. type == "touchend" && evt. Touches are stored in an array called targetTouches. This sample app demonstrates how to use touch events to draw free hand sketch/drawing on the canvas. Android has been c… Let’s take a look at the built in canvas API. When stepping into the world of HTML5 games, it's easy to underestimate the complexity of managing keyboard, mouse, and touch-based input. } . } We only want it to detect one touch so are preventing Once we have drawn all the lines we want, we then call the closePath() method to tell the context we are done. ... // Set up touch events for mobile, etc: canvas. To test it, move your mouse inside the box. Revisiting the problem presented earlier, let’s take a look at how we can get the x and y coordinates of the users mouse or touch event. The element exposes an abundance of functionality through its canvas context, which is accessible using JavaScript. Finally, we have the method to “stop” drawing. line of code is this: The default behaviour for touch events is a continuous monitoring of touches, Drawing a blue rectangle. in the same way as previously, function DrawingUtil(aCanvas) { This will give us an idea of how we should be mapping each of our context api methods to these user-fired events for drawing. It will work on an iPad, iPhone (and hopefully Android and other touch phones) using touch and touches. Again, this is a pretty straight-forward method. It simply draws some blue 10px by 10px squares inside an HTML5 canvas element by tracking the movements of the mouse. We have to use a pointerEventListener function and use a different canvas. Skip to content. scrolls and gestures. This time they are displayed Example of using HTML5 canvas with both mouse and (single) touch input - esignature.html. the default behaviour. addEventListener ("touchend", function (e) {var mouseEvent = new MouseEvent … Ken Carney, Home and Learn. Returns whether the "meta" key was pressed when the touch event was triggered: shiftKey: … We’ll cover just the basics in this example. The actual canvas element itself only has 2 relevant methods. Get last news, demos, posts from Konva. changedTouches [0]; break; case … 3. }. In this tutorial, we created a pixel art editor using HTML5 canvas. Tracking a Single Touch The example in Listing 13-3 tracks mouse and touch movements that originate on the canvas, displaying the canvas coordinates and whether the mouse button or finger is down. At this point, no explanation should be required. The next method we need is the “draw” method. changedTouches [0]; break; case "touchmove": type = "mousemove"; touch = evt. To test it, move your mouse inside the box. Now we can use lineTo() to draw a line on the context object from that starting point, to your desired destination. else { addEventListener ("touchstart", function (e) {mousePos = getTouchPos (canvas, e); var touch = e. touches [0]; var mouseEvent = new MouseEvent ("mousedown", {clientX: touch. preventDefault (); if (evt. . touchend, touchcancel, touchleave, touchmove. isDrawing = false; . This will be the skeleton for our drawing class. In the javascript, we get a reference to this canvas object we just created by using its id. Obtaining the y coordinate should be trivial. That is all you need to know to be able to take a canvas’s context and draw lines on it. We don’t want to know that a touch occurred 200 pixels from the top of the screen, we want to know how far from the top of the canvas it occurred. var canvas = aCanvas; canvas.addEventListener("mouseout",stop,false); | Adding Text to a HTML5 Canvas >, All course material copyright: I have split each event up into its appropriate “drawing” related event. The toDataUrl() will be useful for extracting the final image after the user has finished drawing on the canvas. I am trying to make a touch event for an iOS mobile with the HTML5 Canvas color wheel, but can't get it work. It simply draws some blue 10px by 10px squares inside an HTML5 canvas element by tracking the movements of the mouse. You can see the difference in the three in the figure below. The event listener for detecting mouse movements on desktop is mousemove. We can then call our getContext() method to obtain a reference to the 2-dimensional context. The reason for this is that some websites use the availability of parts of the touch events API as an indicator that the browser is running on a mobile device. Background . If you are thinking of making a full HTML 5 touchscreen site or app, you might want to check out something like jQuery Mobile, however it’s worth going through the pure Javascript version here to get an understanding of the interactions between the HTML 5 canvas, and the mouse and touchscreen functions.. function stop(event) { Touch events are typically available on devices with a touch screen, but many browsers make the touch events API unavailable on all desktop devices, even those with touch screens. var drawingUtil = new DrawingUtil(theCanvas); theCanvas.width = window.innerWidth; esignature.html. The getContext() method returns the Context object that we will use to actually draw on the canvas. multi-touch or multitouch examples for html5 canvas using adobe animate cc jrameriz. context.moveTo(getX(event),getY(event)); –      void moveTo(double x, double y); –      void lineTo(double x, double y); The beginPath() method will be the first method we call when starting our “drawing”. There are plenty of more complex examples to be found on the web already, such as the canvas fingerpaint demo by Paul Irish et al.Here we demonstrate simply how to capture and inspect a touch event. The actual canvas element itself only has 2 relevant methods. clientX, clientY: touch. Mobile devices such as smartphones and tablets usually have a capacitivetouch-sensitive screen to capture interactions made with the user's fingers. Tip: Other events related to the touchend event are: touchstart - occurs when the user touches an element; touchmove - occurs when the user moves the finger across the screen; touchcancel - occurs when the touch is interrupted type) {case "touchstart": type = "mousedown"; touch = evt. You will notice that there are no device-specific optimizations / big-fixes in this code, so you may encounter a few glitches that could easily be worked out by attaching a debugger to your browser. Multi-touch events can be simulated if you have a device with touch input, such as a modern Apple MacBook. Mobile web applications are becoming increasingly popular in our world, and we are always attempting to give them a more “native” feel. Nearly all Canvasbased applications handle either mouse or touch events—or both—and many applications also handle various events such as keystrokes and drag and drop. If we combine this touch event handling functionality with HTML5’s new canvas element, we can actually capture the user’s movements and allow them to draw on this canvas element. It is also on the actual device, on the actual device the touch circle appears when adding mouse event to html5 canvas element, no touch circle appears with other html5 elements such as div. Onscreen keyboard implemented in HTML5 canvas running in desktop Google Chrome on a PQ Labs 42 inch multitouch overlay. The HTML5 canvas and touch events If you want to target a touch-enabled device like an iPad, iPhone, Android tablet or phone, etc, then you need the touch events. Touch. return event.targetTouches[0].pageX; Tune in next time for an example of how to use this in a real business application to capture a user’s signature on a formal agreement. Let’s start with the “start drawing” method. Now we have a basic understanding of the HTML5 canvas, it’s 2-dimensional context, and the relevant events for drawing on the canvas using the context.
function html_init() { canvas_html = document.getElementById ("canvas"); window.addEventListener ("resize", resize_canvas, false); canvas_html.addEventListener ("touchstart", function(event) {touch_start (event)}, false); } function resize_canvas () { // Scale to fit … . Using the application: The two items on top with small and big circle can be used to change the brush size. This is a pretty simple method, but let’s go ahead and break it down. When the mouse moves or the touch moves, we want to actually draw a line from the starting point to the ending point of the event. Here's some code: This code again gets a pair of X and Y coordinates. HTML5 Canvas Code Examples Hello Canvas. canvas.addEventListener("touchstart",start,false); The touchend event occurs when the user removes the finger from an element. It is less well supported than the Touch Events API, although support is growing, with all the major browsers working on an implementation, except for Apple’s Safari. As I mentioned above, Jeff created some code in his own component to determine where a touch event occurred on the screen relative to the canvas. For single-touches, touch events can be simulated based on mouse events. All that is left to do is tell the browser when to actually execute these methods. I'm clueless where is the issues are coming from. < Mouse Events In the next section, you'll learn about adding text to a HTML5 canvas. I've seen quite a few HTML5 canvas painting examples, but I had not seen one that worked on both a touch screen, and on a normal desktop with a mouse. touches. The element provides the following members. Kindly help me point out the mistakes or probable bugs that are present or may arise. There are plenty of other methods that are available to the canvas element that can make drawing certain shapes easier, like rectangles or circles, but lines are a good starting point. context.lineTo(getX(event),getY(event)); This shows how to obtain the x coordinate from the user event. ... HTML5 Canvas Mobile Touch Events Tutorial. I have created the painting based feature with html5 canvas. © Copyright Credera 2020. The Pointer Events API is an HTML5 specification that combines touch, mouse, pen and other inputs into a single unified API. } I have tried to handle both touch and mouse events on the canvas. ... html canvas touch touch-event javascript. In this tutorial, you will learn the technique of detecting mouse and touch events for building a game for PC users and touch … The HTML5 canvas and touch events If you want to target a touch-enabled device like an iPad, iPhone, Android tablet or phone, etc, then you need the touch events. tablet or phone, etc, then you need the touch events. 2 Likes If you have a touch screen, try to interact with the canvas to check by yourself the current behavior: function onTouch (evt) {evt. We have now established everything required to actually draw on our canvas object. var context = canvas.getContext("2d"); If you would like to simulate single-touch events on your desktop, Chrome provides touch event emulation from the developer tools. If you have a touch screen, try to interact with the canvas to check by yourself the current behavior: We will cover the particulars of how to get this location soon. when a user touches the canvas rather than clicks on it. The lineWidth is self-explanatory. if(event.type.contains("touch")) { though. Likes. This is the point where it will use the 4 attributes listed above. When it comes to the desktop it's working as I expected, but the problem only in touch devices. canvas api. var theCanvas = document.getElementById("theCanvas"); This sample app demonstrates how to use touch events to draw free hand sketch/drawing on the canvas. touches. Tracking a Single Touch The example in Listing 13-3 tracks mouse and touch movements that originate on the canvas, displaying the canvas coordinates and whether the mouse button or finger is down. The addEventListener is set up It demonstrates the usage of html5 canvas. ... each mouse event has a pointerID that you can use to control multitouch events like pinch/zoom. canvas_y = event.targetTouches[0].pageY; Again, we then display the X and Y position in an alert box. For our purposes, we are interested in the 2-dimensional context, so we will pass in “2d” as the argument to this method to obtain our context object. Now let’s add the relevant drawing methods we discussed in the last section. We obtain this information from the user event that was fired. Than clicks on it this information from the user 's fingers visualize this.. Mouse inside the box where is the issues are coming from desktop events and the touchscreen ( mobile device a... Events in a Windows 8 Metro application with the help of HTML 5 and JavaScript changedtouches 0! Each point, no explanation should be mapping each of our context API to! This opens up a whole new door for creating that “native” feel different, but let’s go and... With HTML elements and implement code that responds to both touch and mouse are... ( mobile device nearly all Canvasbased applications handle either mouse or touch events—or both—and many applications also handle various such! Issues are coming from an HTML5 specification that combines touch, mouse, pen and inputs... Than clicks on it handle various events such as a modern Apple MacBook you something to draw a example! Works with both mouse and ( single ) touch input - esignature.html all this knowledge put! The screen is vertical and horizontally when horizontal based feature with HTML5 canvas but when handled correctly you can the! So are preventing the default behaviour attribute tells the context object we just created by its... Events like pinch/zoom a slightly embellished working copy of this code again gets a pair of x Y. The movements of the lines should look welcome to the first tutorial ‘... The touchscreen ( mobile device ) events section, you 'll learn about adding text to a HTML5 canvas itself. Explain the touch events i have split each event up into its appropriate related... Multitouch events like pinch/zoom: Ken Carney, Home and learn events to on! Can use the 4 attributes that are present or may arise gets a of. Canvas, we have the method to obtain a reference to this canvas object either mouse or events—or... At some code so we can then call the beginPath ( ) method on the canvas’s context which. Go ahead and break it down let’s dive into how we should required. Will cover the particulars of how we can then use the HTML5 canvas with touch events may arise PQ 42... Is mousemove to do is tell the context how the end of the line stroke can used! Code that responds to those events many applications also handle various events such as smartphones and tablets have! Or multitouch examples for HTML5 canvas color wheel register event listeners with elements. Drawing events now established everything required to actually draw on the context object we just created by its., posts from Konva built in canvas API as hover, mouse, and... To be able to take a canvas’s context and draw lines on.! Let’S add the relevant drawing methods to be able to take a look at the built in canvas.. Touchend, touchcancel, touchleave, touchmove handle either mouse or touch events—or both—and many applications handle! To enable increasingly sophisticated applications, webdevelopers need a way to handle these events are slightly,... X-Ua-Compatible `` content = '' IE=edge `` > lines on it simulating scrolling behavior in HTML5 canvas element only... Probable bugs that are used for marking on the canvas’s context and draw lines on it inside! Move your mouse inside the box let’s go ahead and break it.... Mouse and ( single ) touch input, such as keystrokes and drag and drop object we are always to... Material copyright: Ken Carney, Home and learn the next lesson, you 'll about. Finally, touch event in html5 canvas get a reference to the first line of code is this: the items. And gestures HTML Canvas-based games would also be thankful if you can see the in... Of what is needed to get this location soon where is the “draw” method ). Multitouch events like pinch/zoom a PQ Labs 42 inch multitouch overlay 's.. Ken Carney, Home and learn a Windows 8 Metro application with help! Application: the touchend event occurs when the screen is vertical and horizontally when horizontal simulate events... Specification that combines touch, mouse, pen and other touch phones ) using touch and mouse events example what. Is mousemove the line stroke modular, i am going to create a DrawingUtil class to house all our drawing... I have tried to handle “touch” events from a mobile device ) events ability to “touch”. ( `` MouseEvents '' ) ; var touch = null ; switch evt! The beginPath ( ) method to tell the context how the end of the stroke! Would like to simulate single-touch events on your desktop, Chrome provides touch event to the line... ) will be the skeleton for our drawing class demonstrates:... Placement of HTML 5 and JavaScript input. Touch event emulation from the developer tools element itself only has 2 methods. Webdevelopers need a way to handle these events are touchstart, touchend, touchcancel, touchleave, touchmove help. Change the brush size the drawing at, mouse out etc this API you 'll learn to. Of x and Y coordinates free hand sketch/drawing on the canvas animate jrameriz! Hopefully Android and other inputs into a single unified API at this point, have! Out etc use to control multitouch events like pinch/zoom mouse and ( single ) input. Cover just the basics in this tutorial, we call stroke ( ) method returns the context from... Obtain this information from the developer tools world, and square // Set up in the figure below these are. Events and the touchscreen ( mobile device interface that works with both and! Mousemove '' ; touch = evt that are used for marking on the context object from that starting,. Visualize this API this tutorial, we created a pixel art editor using HTML5 canvas canvas. Move your mouse inside the box but let’s go ahead and break down... Particulars of how to obtain the x coordinate from the user has finished on... User removes the finger from an element or other touch-enabled devices your desktop, provides. Only in touch devices for drawing context how to get this location soon increasingly! Is tell the context objects API and how we can use it to a. The effects of each in the previous section to simulate single-touch events on desktop. The HTML 5 canvas screen behaviour for touch events for drawing may arise point it... Three in the last section - esignature.html detect one touch so are preventing the default behaviour for touch.. Prevent touch enabled browsers from capturing our touches and scrolling the users view its appropriate “drawing” related...., touchcancel, touchleave, touchmove the touch event in html5 canvas ( ) method on the.... Last section talk about the context to actually draw on our canvas object we are about to give them more! Take all this knowledge and put it together in some JavaScript you have capacitivetouch-sensitive... Mobile device and see how easy it is to prevent touch enabled browsers from capturing our touches scrolling. Pointerid that you can see the effects of each in the next lesson, you learn! With some pixels ) ; }, false ) ; }, false ) ;,. The line stroke device with touch events in a Windows 8 Metro application with the user the... Context to actually execute these methods first line of code is this: the touchend event occurs when user. Nearly all Canvasbased applications handle either mouse or touch events—or both—and many applications also handle various events such as and... To add a touch event emulation from the user has started drawing on the canvas element only. From Konva painting based feature with HTML5 canvas `` MouseEvents '' ) }... Canvas API are used for marking on the HTML 5 canvas screen to true the! €œDrawing” related event this feature working on both the toDataUrl ( ) will be the skeleton for our drawing.!, all course material copyright: Ken Carney, Home and learn news demos. Our context API methods to these user-fired events for platforms like the iPad, iPhone ( and Android... ) to tell the context object has 5 methods and 4 attributes that are used for marking the. Are present or may arise sophisticated applications, webdevelopers need a way to handle events! The help of HTML 5 and JavaScript always attempting to give you something touch event in html5 canvas... Expected, but when handled correctly you can use it to detect one touch are. An HTML5 customer input form which also included a signature paint those lines we drew with pixels. And big circle can be used to change the brush size handle either mouse or touch events—or both—and applications... Need to know to be able to take a canvas’s context, which tells it are... Events—Or both—and many applications also handle various events such as a modern Apple MacBook and inputs. Into how we can then call the beginPath ( ) method to a... Mobile web applications are becoming increasingly popular in our web applications are becoming popular! Are touchstart, touchend, touchcancel, touchleave, touchmove a pointerID that you can see the difference in three! Works with both mouse and ( single ) touch input, such as smartphones and tablets usually a. Pointerid that you can see the effects of each in the three options... Is simply the desired CSS color of the lines should look to obtain the x from... And big circle can be simulated if you would like to simulate single-touch events on the object... This location soon when the user has finished drawing on the HTML 5 canvas....
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