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  • AndEngine VS Android's Canvas VS OpenGLES - For rendering a 2D indoor vector map

    - by Orchestrator
    This is a big issue for me I'm trying to figure out for a long time already. I'm working on an application that should include a 2D vector indoor map in it. The map will be drawn out from an .svg file that will specify all the data of the lines, curved lines (path) and rectangles that should be drawn. My main requirement from the map are Support touch events to detect where exactly the finger is touching. Great image quality especially when considering the drawings of curved and diagonal lines (anti-aliasing) Optional but very nice to have - Built in ability to zoom, pan and rotate. So far I tried AndEngine and Android's canvas. With AndEngine I had troubles with implementing anti-aliasing for rendering smooth diagonal lines or drawing curved lines, and as far as I understand, this is not an easy thing to implement in AndEngine. Though I have to mention that AndEngine's ability to zoom in and pan with the camera instead of modifying the objects on the screen was really nice to have. I also had some little experience with the built in Android's Canvas, mainly with viewing simple bitmaps, but I'm not sure if it supports all of these things, and especially if it would provide smooth results. Last but no least, there's the option of just plain OpenGLES 1 or 2, that as far as I understand, with enough work should be able to support all the features I require. However it seems like something that would be hard to implement. And I've never programmed in OpenGL or anything like it, but I'm willing very much to learn. To sum it all up, I need a platform that would provide me with the ability to do the 3 things I mentioned before, but also very important - To allow me to implement this feature as fast as possible. Any kind of answer or suggestion would be very much welcomed as I'm very eager to solve this problem! Thanks!

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  • WPF - Adding ContentControl to Custom Canvas

    - by Alp Hancioglu
    I have a custom DrawingCanvas which is inherited from Canvas. When I add a ContentControl to DrawingCanvas with the following code nothing shows up. GraphicsRectangle rect = new GraphicsRectangle(0, 0, 200, 200, 5, Colors.Blue); DrawingContainer host = new DrawingContainer(rect); ContentControl control = new ContentControl(); control.Width = 200; control.Height = 200; DrawingCanvas.SetLeft(control, 100); DrawingCanvas.SetTop(control, 100); control.Style = Application.Current.Resources["DesignerItemStyle"] as Style; control.Content = host; drawingCanvas.Children.Add(control); GraphicsRectangle is a DrawingVisual and the constructor above draws a Rect with (0,0) top left point and length of 200 to the drawingContext of GraphicsRectangle. DrawingContainer is a FrameworkElement and it has one child, which is rect above, given with constructor. DrawingContainer implements GetVisualChild and VisualChildrenCount override methods. At last, Content property of ContentControl is set to the DrawingContainer to be able to show the DrawingVisual's content. When I add the created ContentControl to a regular Canvas, control is showed correctly. I guess the reason is that DrawingCanvas doesn't implement ArrangeOverride method. It only implements MeasureOverride method. Also DrawingContainer doesn't implement Measure and Arrange override methods. Any ideas?

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  • Move rotating image along Canvas

    - by fatnic
    Hi. I've managed to make an image rotate on my canvas. And I've managed to make an image move along the canvas. My problem now is making it do both. I have got it working but I seems a bit like a hack. I've posted a demo online Here's the code. var cnv = document.getElementById("drawing"); var c = cnv.getContext('2d'); var image = new Image(); image.src = 'images/spaceship.png'; var imgWidth = image.width; var imgHeight = image.height; var i=0; function animate() { c.clearRect(0,0,640,480); c.save(); c.translate(-(imgWidth/2)+i,200); c.rotate(i * Math.PI/180); c.translate(-(imgWidth/2),-(imgHeight/2)); c.drawImage(image, 0, 0); c.restore(); (i==640+imgWidth) ? i=0: i+=2; }; setInterval(animate, 1); I think my problem is I'm not understanding the translate() method properly. Is this the correct way to do it or am I competely way off?

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  • HTML5 Canvas and Game Programming

    - by LemonBeagle
    I hope this isn't too open ended. I'm wondering if there is a better (more battery-friendly) way of doing this -- I have a small HTML 5 game, drawn in a canvas (let's say 500x500). I have some objects whose positions I update every 50ms or so. My current implementation re-draws the entire canvas every 50ms. I can't imagine that being very good for battery life on mobile platforms. Is there a better way to do this? This must be a common pattern with games. EDIT: as requested, here are some more updates: Right now, the objects are geometric primitives drawn via arcs and lines. I'm not opposed to making these small png/jpg/gif files instead of that'd help out. These are small graphics -- just 15x15 or so. As the game progresses, more and more of the screen changes at a time. However, at the start, the screen changes relatively slowly (the objects randomly moved a few pixels every 50ms).

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  • HTML5 Canvas: How to make a loading spinner by rotating the image in degrees?

    - by Bill
    I am making a loading spinner with html5 canvas. I have my graphic on the canvas but when i rotate it the image rotates off the canvas. How do I tell it to spin the graphic on its center point? <!DOCTYPE html> <html> <head> <title>Canvas test</title> <script type="text/javascript"> window.onload = function() { var drawingCanvas = document.getElementById('myDrawing'); // Check the element is in the DOM and the browser supports canvas if(drawingCanvas && drawingCanvas.getContext) { // Initaliase a 2-dimensional drawing context var context = drawingCanvas.getContext('2d'); //Load the image object in JS, then apply to canvas onload var myImage = new Image(); myImage.onload = function() { context.drawImage(myImage, 0, 0, 27, 27); } myImage.src = "img/loading.png"; context.rotate(45); } } </script> </head> <body> <canvas id="myDrawing" width="27" height="27"> </canvas> </body> </html>

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  • How to run setInterval() on multiple canvases simultaneously?

    - by Alex
    I have a page which has several <canvas> elements. I am passing the canvas ID and an array of data to a function which then grabs the canvas info and passes the data onto a draw() function which in turn processes the given data and draws the results onto the canvas. So far, so good. Example data arrays; $(function() { setup($("#canvas-1"), [[110,110,100], [180,180,50], [220,280,80]]); setup($("#canvas-2"), [[110,110,100], [180,180,50], [220,280,80]]); }); setup function; function setup(canvas, data) { ctx = canvas[0].getContext('2d'); var i = data.length; var dimensions = { w : canvas.innerWidth(), h : canvas.innerHeight() }; draw(dimensions, data, i); } This works perfectly. draw() runs and each canvas is populated. However - I need to animate the canvas. As soon as I replace line 8 of the above example; draw(dimensions, data, i); with setInterval( function() { draw(dimensions, data, i); }, 33 ); It stops working and only draws the last canvas (with the others remaining blank). I'm new to both javascript and canvas so sorry if this is an obvious one, still feeling my way around. Guidance in the right direction much appreciated! Thanks.

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  • How to save HTML5 canvas?

    - by bebraw
    Currently I am using Canvas2Image to save the content of my HTML5 canvas. It doesn't appear to work in Google Chrome, however. Any ideas on how to work around the issue are welcome. :)

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  • What is html5 canvas?

    - by Dan
    I'm a little confused to what html5 canvas is. I've been told it is javascript, but it seems to be a much bigger deal? What makes it different than javascript? Why is it so amazing? Does it do other things than javascript? Thanks, Dan

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  • Resizing canvas, where's the problem?

    - by Noor
    I'll post a link since theres to much to post here: http://hem.bredband.net/noor/canvas.htm My goal is to make the picture fit inside the window with the width of the image being the same as the window, even after resize. If the pictures height becomes to big for the window then the picture should resize itself according to the height and not the width. Somewhere along my code there is something wrong.. forgive me if this is stupid, i am still learning.. Thanks!

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  • HTML 5 CANVAS ANIMATION

    - by cooldude
    Hi, I wanted to have an interface to allow the user to create animation on the browser using canvas element and then i have to save that animation and later reproduce that animation to the others users. Can anybody How can i do this. Please reply quickly . I have my deadline.

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  • ASP.net canvas server control

    - by Pierreten
    I was wondering if anyone has come up with an ASP.net server tag for the HTML5 canvas? I was thinking of something where I could declaritively define paths, curves; etc in the aspx markup, and the control would deliver the js to do this (perhaps with support for browser detection, and delivery of an emulation script for IE browsers.) Maybe a good idea for a Codeplex project for me to start up?

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  • current transform being applied by canvas

    - by Allain Lalonde
    How can I determine the current transform that's being applied by an html5 canvas. It seems that it only supports two methods for dealing with transforms "transform", "setTransform" but I can't seem to discover the results of applying the transforms. Short of tracking them all myself and duplicating the the matrix mathematics that it must be doing natively, how can I figure out the current transform?

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  • HTML 5 Canvas performance

    - by Vilius
    Hello there! I'm just started on playing around with the canvas HTML5-object. For the sake of performance tests, I have made a little ping pong game (http://bit.ly/arTPut). Apart from my quick'n'dirty programming skills, I believe, that there are also some performance boosts, I haven't used. Especially, the ball seams to be blue with a little red-touch, but by my decleration it should be yellow. Would be very nice, if someone could help me! Greetings, Vilius

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  • dotted stroke in <canvas>

    - by Sam
    I guess it is not possible to set stroke property such as CSS which is quite easy. With CSS we have dashed, dotted, solid but on canvas when drawing lines/or strokes this doesn't seem to be an option. How have you implemented this? I've seen some examples but they are really long for such a silly function. For example: http://groups.google.com/group/javascript-information-visualization-toolkit/browse_thread/thread/22000c0d0a1c54f9?pli=1

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  • Canvas Animation

    - by Aidia
    I'm making a graph script using canvas, i'm adding animation to a chart but i don't like the way that it's look, i use setInterval for X function adding height to a rectangle to make a bar chart for example, but i wanna an animation more fluid, is another way to do an animation?

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  • Using HTML Canvas for UI elements?

    - by Tower
    Hi, I have a couple of UI elements such as buttons in my web application. I was going to use CSS3's transitions to animate the transition from one background-image to another. I figured out that it's not possible with the current transitions draft at least. So, I was wondering if it would make sense to use Canvas as the button. I'm sure it can handle events, so, I see no problems here. Are there any?

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