I'm using context-blender to apply a multiply effect on the first 192 pixels of the html background-image with a fixed color to achieve a transparency effect on the header of the page.
On the html I have 2 canvas. One for the part of the image to apply the multiply effect and one for the color.
On the javascript, after setting the color of the color-canvas and the width of both canvas to the window.innerWidth I'm getting the background image with:
imageObj.src = $('html').css('background-image').replace(/^url|[\(\)]/g, '');
Now comes the problem. I want to draw a cropped image to the image to the image-canvas so I can apply the multiply effect. I'm trying to do the following:
imageObj.onload = function(){
// getting the background-image height
var imageHeight = window.innerWidth * imageObj.height / imageObj.width;
// get the corresponding pixels of the source image that correspond to the first 192 pixels of the background-image
var croppedHeight = 192 * imageObj.height / imageHeight;
// draw the image to the canvas
imageCanvas.drawImage(imageObj, 0, 0, imageObj.width, croppedHeight, 0, 0, window.innerWidth, 192);
// apply the multiply effect
colorCanvas.blendOnto( imageCanvas, 'multiply');
}
But I'm doing something wrong getting the cropped height.
Ex: For an 1536x1152 image and a 1293x679 browser container, the value I'm getting for the source cropped height is 230 but to get the correct crop I need to use something around 296.
Edit:
I'm using background-size: cover on the css to create the background-image
Edit2:
I created a fiddle to illustrate the problem. If you uncomment the line //cHeight *= magicConstant; the cropped image looks a lot better but things stop making sense. I removed the multiply effect on the fiddler but that's not required to reproduce the problem. I also noticed that the behavior changed if I remove the second canvas from the URL.
Btw, this behavior happened with google chrome, but I think the same thing happens on safari and firefox.
OK, I've fixed it. Man was that hard! Mainly because you forgot to set the imageCanvas' canvas height. It also didn't help that the image has a white border. I spent a hell of a lot of time trying to figure out where the padding was coming from.
So to start, for the case of the fiddle, in function doBlending(), set imageCanvas.canvas.height = height;
Then the calculations in crop() need to cover 2 possibilities. Is the image being scaled for height and truncated on the left or scaled for width and truncated on the bottom? I'm not going to write both for you, but here's the one for the case where it is scaled for height:
function crop(imageObj, imageCanvas, colorCanvas) {
// Assumes bg image is scaled for hight
var scale = imageObj.height / window.innerHeight;
var targetHeight = imageCanvas.canvas.height;
var targetWidth = window.innerWidth;
imageCanvas.drawImage(imageObj,
0, 0, targetWidth * scale, targetHeight * scale,
0, 0, targetWidth, targetHeight);
}
I really have no idea where you came up with the scaling factors in your example. The image is going to be scaled by multiplying both the x and y dimensions by some scale factor. That's how you preserve the aspect ratio. The scale factor will be the larger of the one to make the height of the image match the height of the window and the one to make the width of the image match the width of the window.
I think it may not be valid for you to be using window inner dimensions here. Since cover will maintain the aspect ratio of the background image it means that both of its dimensions may not be fully displayed. So if you are trying to transform between aspect ratios to determine where to clip, you would have to account for the fact that the image may flow out of the window borders.
Related
I am using one canvas in my web app and it's actual height and width are 500px. I am showing this canvas on screen as 500px square but i want image exported from this canvas as 1600px square. I have tried below code with no luck.
canvas.width = 1600;
canvas.style.width = 500;
Any help will be appreciated.
You can have the canvas display at 500px while still having a resolution of 1600px. Display size and resolution are independent. For resolution you set the canvas width and height properties. For display size you set the canvas style width and height properties.
// create a canvas or get it from the page
var canvas = document.createElement("canvas");
// set the resolution (number of pixels)
canvas.width = canvas.height = 1600;
// set the display size
canvas.style.width = canvas.style.height = "500px";
// get the rendering context
var ctx = canvas.getContext("2d");
To get the rendering to match the display size you need to scale up all rendering. You can do this by setting the transform scale to the canvas resolution divided by the display size
var scale = 1600 / 500; // get the scale that matches display size
ctx.setTransform(scale,0,0,scale,0,0);
Now when you render to the canvas you use the screen size coordinates.
ctx.fillRect(0,0,500,500); // fill all of the canvas.
ctx.fillStyle = "red"; // draw a red circle 100 display pixels in size.
ctx.beginPath();
ctx.arc(250,250,100,0,Math.PI * 2);
ctx.fill();
When you then save the canvas, what ever method you use as long as it is not screen capture the saved canvas will be 1600 by 1600 and all the rendering will be correctly positions and proportional
HTML
<canvas width="1600px" height="1600px" > </canvas>
CSS
canvas{
position :absolute;
transform:scale(0.3125);
left:-500px; //adjust
top:-350px; //adjust
}
Use transform:scale() to adjust size of your canvas
Now 1600 * 1600 will be the actual size of your canvas, so you can directly export images from your canvas
But in view it show as 500px * 500px beacuse it's scaled down, it dose not affect the image quality while exporting
Honest answer: you can't.
If you did, then you'd have found a way to losslessly compress data with less than 1/9th of the original size, and without any encoding, which is unarguably impossible.
What you can do is scale it up in a way that it at least doesn't get blurry. To do that, you need the final image to be an integer multiple of the previous canvas, so the browser won't apply anti-aliasing. Or if you want to use your own copying formula with putImageData that would get rid of anti-aliasing, you'll still get various incongruences and it would be very slow
In your case, the closest you could get is 1500x1500 ( 3*500x3*500 ). If your point was to process an image, you're not in luck, but if you just want to display something good enough, you can resort to various other tricks such as centering the canvas and using properties like box-shadow to make it clear that it's separate from the rest of the screen
Let's put some text on a HTML5 <canvas> with
var canvas = document.getElementById('myCanvas'),
ctx = canvas.getContext('2d'),
ctx.textBaseline = 'top';
ctx.textAlign = 'left';
ctx.font = '14px sans-serif';
ctx.fillText('Bonjour', 10, 10);
When zooming the canvas on text, one can see pixelation.
Is there a way of zooming on a canvas without having pixelation on text ?
When you fillText on the canvas, it stops being letters and starts being a letter-shaped collection of pixels. When you zoom in on it, the pixels become bigger. That's how a canvas works.
When you want the text to scale as a vector-based font and not as pixels, don't draw them on the canvas. You could create <span> HTML elements instead and place them on top of the canvas using CSS positioning. That way the rendering engine will render the fonts in a higher resolution when you zoom in and they will stay sharp. But anything you draw on the canvas will zoom accordingly.
Alternatively, you could override the browsers zoom feature and create your own zooming algorithm, but this will be some work.
When the user zooms in or out of the window, the window.onresize event handler is triggered. You can use this trigger to adjust the width and the height of the canvas css styling accordingly (not the properties of the canvas. That's the internal rendering resolution. Change the width and height attributes of the style which is the resolution it is scaled to on the website).
Now you effectively disabled the users web browser from resizing the canvas, and also have a place where you can react on the scaling input events. You can use this to adjust the context.scale of your canvas to change the size of everything you draw, including fonts.
Here is an example:
<!DOCTYPE html>
<html>
<head>
<script type="application/javascript">
"use strict"
var canvas;
var context;
function redraw() {
// clears the canvas and draws a text label
context.clearRect(0, 0, context.canvas.width, context.canvas.height);
context.font = "60pt sans-serif";
context.fillText("Hello World!", 100, 100);
}
function adjustSize() {
var width = window.innerWidth;
var height = window.innerHeight;
// resize the canvas to fill the whole screen
var style = canvas.style;
style.width = width + "px";
style.height = height + "px";
// backup the old current scaling factor
context.save();
// change the scaling according to the new zoom factor
context.scale(1000 / width, 1000 / height);
// redraw the canvas
redraw();
// restore the original scaling (important because multiple calls to scale are relative to the current scale factor)
context.restore();
}
window.onload = function() {
canvas = document.getElementById("myCanvas");
context = canvas.getContext("2d");
adjustSize();
}
window.onresize = adjustSize;
</script>
</head>
<body>
<canvas id ="myCanvas" width = 1000 height = 1000 ></canvas>
</body>
</html>
If you only need to scale text you can simply scale the font size.
A couple of notes on that however: fonts, or typefaces, are not just straight forward to scale meaning you will not get a smooth progress. This is because fonts are often optimized for certain sizes so the sizes in between so to speak are a result of the previous and next size. This can make the font look like it's moving around a little when scaled up and is normal and expected.
The approach here uses a simply size scale. If you need an absolute smooth scale for animation purposes you will have to use a very different technique.
The simple way is:
ctx.font = (fontSize * scale).toFixed(0) + 'px sans-serif';
An online demo here.
For animation purposes you would need to do the following:
Render a bigger size to an off-screen canvas which is then used to draw the different sizes
When the difference is too big and you get problems with interpolation you will have to render several of these cached text images at key sizes so you can switch between them when scaling factor exceeds a certain threshold.
In this demo you can see that at small sizes the pixels gets a bit "clumpy" but otherwise is much smoother than a pure text approach.
This is because the browser uses bi-linear interpolation rather than bi-cubic with canvas (this may or may not change in the future) so it's not able to interpolate properly when the difference gets to big (see below for solution with this issue).
The opposite happens at big sizes as the text gets blurry also due to interpolation.
This is where we would have to switch to a smaller (or bigger) cached version which we then scale within a certain range before we again switch.
The demo is simplified to show only a single cached version. You can see halfway through that this works fine. The principle would be in a full solution (sizes being just examples):
(Update Here is a demo of a switched image during scale).
-- Cached image (100px)
-- Draw cached image above scaled based on zoom between 51-100 pixels
-- Cached image (50px) generated from 100px version / 2
-- Draw cached image above scaled based on zoom between 26-50 pixels
-- Cached image (25px) generated from 50px version / 2
-- Draw cached image above scaled based on zoom between 1-25 pixels
Then use a "sweet spot" (which you find by experiment a little) to toggle between the cached versions before drawing them to screen.
var ctx = canvas.getContext('2d'),
scale = 1, /// initial scale
initialFactor = 6, /// fixed reduction scale of cached image
sweetSpot = 1, /// threshold to switch the cached images
/// create two off-screen canvases
ocanvas = document.createElement('canvas'),
octx = ocanvas.getContext('2d'),
ocanvas2 = document.createElement('canvas'),
octx2 = ocanvas2.getContext('2d');
ocanvas.width = 800;
ocanvas.height = 150;
ocanvas2.width = 400; /// 50% here, but maybe 75% in your case
ocanvas2.height = 75; /// experiment to find ideal size..
/// draw a big version of text to first off-screen canvas
octx.textBaseline = 'top';
octx.font = '140px sans-serif';
octx.fillText('Cached text on canvas', 10, 10);
/// draw a reduced version of that to second (50%)
octx2.drawImage(ocanvas, 0, 0, 400, 75);
Now we only need to check the sweet spot value to find out when to switch between these versions:
function draw() {
/// calc dimensions
var w = ocanvas.width / initialFactor * scale,
h = ocanvas.height / initialFactor * scale;
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (scale >= sweetSpot) {
ctx.drawImage(ocanvas, 10, 10, w, h); /// use cached image 1
} else {
ctx.drawImage(ocanvas2, 10, 10, w, h); /// use cached image 2
}
}
So why not just draw the second cached image with a font? You can do that but then you are back to the issue with fonts being optimized for certain sizes and it would generate a small jump when scaling. If you can live with that then use this as it will provide a little better quality (specially at small sizes). If you need smooth animation you will have to reduce a larger cached version in order to keep the size 100% proportional.
You can see this answer on how to get a large image resized without interpolation problems.
Hope this helps.
When the canvas element is resized (via the style changing) I also want to scale the canvas' drawn image as well. I cannot just change the height/width as this causes the canvas to clear itself, so I do:
Create a temporary canvas element
Draw the current canvas' image onto that temporary canvas
Resize the current canvas
Draw the temp canvas' image back to the current canvas but scaled to the new size
This results in some blurring - very noticeable after many resizes (example: when dragging to resize). How would I do this without any blurring?
EDIT: Turning off image smoothing (context.webkitImageSmoothingEnabled = false;) does not fix the problem, it simply makes it redraw it more and more jagged until the image looks nothing like the original after a number of resizes.
Called on resize event:
var tmpCanvas = null;
//Make a temporary canvas
tmpCanvas = document.createElement( "canvas" );
//Set its size to be equal
tmpCanvas.height = originalCanvas.height;
tmpCanvas.width = originalCanvas.width;
//Draw our current canvas onto it
tmpCanvas.getContext( "2d" ).drawImage( originalCanvas, 0, 0 );
//Set new dimensions
originalCanvas.width = originalCanvas.offsetWidth;
originalCanvas.height = originalCanvas.offsetHeight;
var originalContext = originalCanvas.getContext( "2d" );
//Set background and colors
originalContext.fillStyle = "#ffffff";
originalContext.strokeStyle = "#000000";
//Set paintbrush
originalContext.lineWidth = 4;
originalContext.lineCap = "round";
//Fill background as white
originalContext.fillRect( 0, 0, originalCanvas.width, originalCanvas.height );
//We have a saved signature
if ( SignatureCanvas.hasSignature === true )
{
//Draw it back but scaled (results in blurred image)
originalContext.drawImage( tmpCanvas, 0, 0, tmpCanvas.width, tmpCanvas.height, 0, 0, originalCanvas.width, originalCanvas.height );
/**
* This results in a blurred image as well
//Draw it back but scaled
originalContext.scale( originalCanvas.width / tmpCanvas.width, originalCanvas.height / tmpCanvas.height );
originalContext.drawImage( tmpCanvas, 0, 0, tmpCanvas.width, tmpCanvas.height, 0, 0, tmpCanvas.width, tmpCanvas.height );
*/
}
Is there a way to get the strokes and "scale" all those points and redraw?
Instead of taking the rendered image from the original canvas, actually redraw the image. By that, I mean execute the same logic you executed against the original canvas, but with the points involved scaled to the new size.
If you can, think about using SVG instead. It scales well by its nature.
Edit: Another option I've thought of is to simply use a gigantic canvas to start with. Sizing down tends to look better than sizing up, especially with smoothing on.
Edit II: The original answer was irrelevant, though the comment I had made is relevant, and am now promoting it and editing it to be an answer...and the answer I had given was not all that great anyway **.
Of course if you scale up raster graphics, that is, from an image with a smaller pixel dimensions of pixels, create an image with higher pixel dimensions, you are going to get blurred images. By scaling up, you're making a low resolution picture high resolution, but without the high resolution details.
There's absolutely no way around that blurriness unless you make multiple additional assumptions about your raster image like the only gray you'd see is at an image edge, or corners can only occur at apparent inflection points where the angle between the tangents of the joined curves must be 100 degrees or less. Essentially, you'd have to give additional information so that your higher resolution image can have detail "filled in". It's not all that terribly different from reverse engineering an SVG from a raster.
So, you appear to want to emulate is scaling vector graphics, in which the only solution is to save the commands, draw a SVG, or draw to a bigger canvas like Stuart Branham suggested.
** I had originally proposed that invoking drawImage would distort the pixels even if it were not scaled, and that it would be better to work with the actual pixel data. If that's true, I can't find proof, but that's irrelevant, as he wanted his image scaled up, without blurring...which is impossible, as I just mentioned.
For a Project I want to take the content of a canvas (Called SAVE_CV) and display it in another, smaller canvas.
Some things that I am aware of so far that could be causing me problems: resizing a canvas clears its content, the JS-size of a canvas is different from the CSS-size.
I want the smaller canvas to be 500px wide and appropriately high.
function restoreTaggingCV() {
var cv = document.getElementById( 'taggingCV' );
var ctx = cv.getContext( "2d" );
var styleHeight = SAVE_CV.height * 500 / SAVE_CV.width;
ctx.drawImage(SAVE_CV, 0, 0, cv.width, cv.height);
}
This is my Code so far. Whenever I try to resize the smaller canvas appropriately it only gives me a blank canvas with nothing in it. I tried to set the size with "cv.height = X" and "cv.style.height = styleHeight + 'px'" but neither worked. Also I would love to set the width of the canvas using CSS.
Appreciate any help.
EDIT
I want the image in a picture because later I want the user to mark areas in the smaller version which I then want to use to create individual imaged from the big version. I want to visualise thise area to the user. I probably could do all this by using an image and putting divs over it or something but I just fell more comfident using a canvas since I am pritty new to HTML and CSS.
Try using the CanvasRenderingContext2d.prototype.scale method. It sets the scale factor of the canvas and renders anything in the current state with it's dimensions multiplied by the factor.
So before you use the drawImage function, you scale the context appropriately (in this case, down). For example:
context.save();
context.scale(0.5, 0.5);
context.drawImage(canvas, 0, 0);
context.restore();
This would render the canvas on the context at 0.5 times it's current size. See in this fiddle how I used it to mirror a larger canvas onto a smaller, separate one.
Canvas objects don't like to be resised. After drawing Your image simply convert it toDataURL() and set as image source. They You may resize image as you want.
$img.attr('src',canvas.toDataURL());
Sort of a small issue here that I've been struggling to find an answer to.
I am using the ios native camera to take a photo which I am then sending to phonegap to run some javascript on.
I pass the image into javascript, then draw it onto the left side of a small canvas element I have prepared in which the right side I will produce an altered image of the original (a side by side comparison). I realize that the images between the iphone4 and the iphone4s are differently sized pixel-wise but are at least the same proportion. My draw code:
function imageLoaded(img, frontCamera) {
element = document.getElementById("canvas1");
c = element.getContext("2d");
// read the width and height of the canvas- scaled down
width = element.width; //188 94x2
height = element.height; //125
//used for side by side comparison of images
w2 = width / 2;
// stamp the image on the left of the canvas
if (frontCamera) {
c.drawImage(img, 0, 0, 94, 125);} else{
c.drawImage(img, 0, 0, 94, 125)}
// get all canvas pixel data
imageData = c.getImageData(0, 0, width, height);
//more stuff here
}
When I execute this code on an iphone4, the image appears as should, side by side with the corrected image. When I use an iphone4s, the image draws out with the correct width, but it is a super squashed image, occupying the top sliver of the canvas.
Both devices are registering a screen.height and screen.width of 480 and 320 respectively with a window.devicePixelRatio of 2.
I figured the drawImage function would inherently scale the image appropriately.
I cannot seem to figure out what I am doing wrong. Thanks for the help!
"I realize that the images between the iphone4 and the iphone4s are differently sized pixel-wise but are at least the same proportion."
iPhone 4 and iPhone 4s have the exact same screen size and pixel ratio and number of pixels, etc. They are esentially the same. If you're drawing each one different, then there's your problem.
The iPhone 3gs and below have non-retina displays.
The iPhone 5 has retina but is taller.
If that's not the case, then it's something in your code (which means unless you publish it we can't help all that much).
I doubt very much that the issue is with Phonegap itself.