I want my canvas and background image to scale to any browser size which I have learnt is possible through this.
<canvas id="canvas" style="width:100%; height:100%;
background-size:100% 100%; left:0px; top: 0px;">
Setting the width and height using percentages causes whatever I draw on top to come out blurred.
The reason for this I read is that it comes out blurry because the width and height of canvas set using css is different.
It is absolutely imperative that I keep track of the co-ordinates since I have written a collision detection logic using the original size of the image.
Is it possible to dynamically change the canvas size to fill the screen, redraw it and ensure that the collision logic works perfectly without blurry drawing on top?
Lets take an example here. The image floor.jpg that I want as the background of the canvas is 1200X700. I want the canvas to be 100% of the page width and height. My animated player that moves on top of it requires collision detection with walls which I have coded keeping in mind the 1200x700 image.
I have gone through the various similar question on this site, but can't seem to figure it out.
Related
i'm starting to build this bootstrap site where I have flash animation on my fontpage. --> http://testi9.aada.fi/index.php?cID=180
My animation size is 1472px x 485px. Now I want it to be 100% width on bootstrap site so that it would strech nicely on different screen sizes.
I added this css code on bootstrap css file:
#swfcontent169 {
border:solid thin #f00;
width:100%;
}
Now my flash animation is 100% but somehow those "symbols" that are
on my flash animation on each side are visible too and animation is not stretched as i would like it to be (full width).
Can someone help me out with this?
// Mika
You need to set the proper scaling mode for the flash object. (the scale embed property) or stage.scaleMode through AS3 code.
Here is a visual rundown of the options: (you will likely want exact fit or no border)
Let's say this is your document:
We have four boxes (one per corner), and some gray boxes that are off the stage.
Here are you options:
Show All:
Show all scales the content so the whole stage fits, but then you get a gutter if it's not the right size and objects off stage may be visible.
No Border:
This will scale it so the whole content will fill the bounds (keeping aspect), but then if it's not the exact size, you'll get cropping of the stage, see how the boxes are being cropped on the top bottom? You can change the way it aligns the cropped stage with the stageAlign property.
Exact Fit
This will just make the whole stage fit in the area defined, but it will not honor your aspect ratio and things could looked squished/stretched.
No Scale
This won't scale the stage AT ALL. So if the defined area is smaller than the stage, it will crop it, if larger, you'll get gutters.
You probably want exact fit or no border - depending on if you need the aspect ratio to be fixed. You can also use no-scale and use code to align your contents the way you want.
You can align the content several ways too using the align embed parameter.
You can adjust these in your embed code. There are also options in the FlashPro publish settings (when you click on the HTML Wrapper Format), or you can use an online tool like: http://embed-swf.org/embed-swf.php
I've started experimenting with drawing on a Canvas object. In the past my exposure to a Canvas has been centered (NPI) around image manipulation, so I'm moderately familiar with its coordinate system and transformation process. I'm working with a test canvas that has a screen dimension of 30 X 30. After getting a handle to the 2D context I issue one call:
ctx.fillRect(0,0,10,10);
produces a little black spec about the size of a pin head in the upper left corner. To get the rectangle to be of any size, say something approximate 1/4 of the canvas, requires an adjustment to:
ctx.fillRect(0,0,200,200);
So, how has this canvas's scale been skewed? Yes, I guess I could "de-scale" it back to something resembling normal, but I'd like to figure out what's causing this in the first place. I've disabled Jquery thinking it might be interfering somehow, but that did not help.
Any ideas?
UPDATE:
The canvas is added to the dom along these lines:
<canvas id='foo_" + self.groupIndex + "' class='hCanvasClassName'>"
whereby the CSS defines the width at 100% and the height is assigned by JS code.
You didn't show the code for this, but it sounds as you have applied the size for the canvas using CSS and not directly on the element which would explain why it scales down.
You need to do this:
<canvas width="30" height="30" id="myCanvas"></canvas>
If you did this:
<canvas style="width:30px;height;30px;" id="myCanvas"></canvas>
what will happen is that the canvas element uses a default size (300x150, see here: http://jsfiddle.net/AbdiasSoftware/CfMNf/) and then you scale that down to 30x30 by css which means everything now drawn to the canvas will be scaled accordingly.
Following http://www.html5canvastutorials.com/tutorials/html5-canvas-rectangles/, I have drawn some rectangles side-by-side on a canvas. The problem is that they appear greatly zoomed in; at a zoom of 1.0 they appear approximately five times their original size; they appear correctly sized (if fuzzy around the borders) at a zoom of around 0.16.
I expect I could get a workaround by making the pixel dimensions of the canvas much greater and zooming out, but what is the proper way to get a 1:1 scaling on a canvas? The canvas is styled to width and height of 100%, and the body has a margin of 0. Manually setting the canvas's width and height to the height and width of the window does not alter this behavior.
TIA,
the problem is, you set the width and height of the style for the canvas. You need to set the width and height attributes, not the css style. so something like:
<canvas id='mycanvas' width='800' height='600'></canvas>
More info in a similar question: Canvas is stretched when using CSS but normal with "width" / "height" properties
Having trouble scaling with . It seems to make sense to code up a drawing in canvas to a fixed size (ie 800x600) then scale it for specific locations - but sizing occurs in 4 places: 1) in the context definition (ie ctx.width = 800 2) with ctx.scale; 3) in html with
I can scale it with ctx.scale(0.25,0.25) and use but this doesn't appear right - it seems to want the scale to be proportional.
css sizing simply makes it fuzzy so not a good way to go. Any ideas?
Actually, you can resize a canvas using stylesheets. The results may vary across browsers as HTML5 is still in the process of being finalized.
There is no width or height property for a drawing context, only for canvas. A context's scale is used to resize the unit step size in x or y dimensions and it doesn't have to be proportional. For example,
context.scale(5, 1);
changes the x unit size to 5, and y's to 1. If we draw a 30x30 square now, it will actually come out to be 150x30 as x has been scaled 5 times while y remains the same. If you want the logo to be larger, increase the context scale before drawing your logo.
Mozilla has a good tutorial on scaling and transformations in general.
Edit: In response to your comment, the logo's size and canvas dimensions will determine what should be the scaling factor for enlarging the image. If the logo is 100x100 px in size and the canvas is 800x600, then you are limited by canvas height (600) as its smaller. So the maximum scaling that you can do without clipping part of the logo outside canvas will be 600/100 = 6
context.scale(6, 6)
These numbers will vary and you can do your own calculations to find the optimal size.
You could convert the logo to svg and let the browser do the scaling for you, with or without adding css mediaqueries.
Check out Andreas Bovens' presentation and examples.
You can resize the image when you draw it
imageobject=new Image();
imageobject.src="imagefile";
imageobject.onload=function(){
context.drawImage(imageobject,0,0,imageobject.width,imageobject.height,0,0,800,600);
}
The last 2 arguments are the width an height to resize the image
http://www.w3.org/TR/html5/the-canvas-element.html#dom-context-2d-drawimage
If you set the element.style.width and element.style.height attributes (assuming element is a canvas element) you are stretching the contents of the canvas. If you set the element.width and element.height you are resizing the canvas itself not the content. The ctx.scale is for dynamic resizing whenever you drawing something with javascript and gives you the same stretching effect as element.style.
I have a mask i'm using for a continuous scroll type thingy, and notice that when my masked sprite gets past a certain pixel size in height (2878) the mask does not mask. Has anyone experienced this? is this a bug?
to reproduce:
create a sprite over 2878 px in height and apply mask, mask breaks
create a sprite 2877 px in height and apply mask, mask works
I can't verify if that is a hard limit, but there are a bunch of similar size limits for bitmaps in Flash that crop up in various areas. One potential solution would be to use the scrollRect property of your content display object. When you set scrollRect you are essentially creating a rectangular mask and I'm almost positive I've done it with 5000+ pixel wide sprites in the past.