The documentation on window (http://developer.getpebble.com/docs/pebblejs/#window) says that we can add an image to it:
"Window: The Window by itself is the most flexible. It allows you to add different Elements (Circle, Image, Rect, Text, TimeText) and to specify a position and size for each of them. You can also animate them."
An image is an element, but there is no documentation on the image constructor. What parameters does it take? Particularly, how do we specify the image src? Also, there is no example code of adding an image to a window.
We're still working on improving Pebble.js and its documentation, but in the meantime, this should get you started with adding Images with Pebble.js:
var UI = require('ui');
var logo_image = new UI.Image({
position: new Vector2(0, 0),
size: new Vector2(144, 144),
backgroundColor: 'clear',
image: 'images/logo_image.png',
});
wind.add(logo_image);
wind.show();
Related
I'm very new to both JointJS and SVG, so I am having a hard time interpreting some of the documentation for JointJS. I am trying to get randomly searched images to display in a circle for this project, in a graph that uses JointJS to display and link the images with arrows. I am convinced this shouldn't be as hard as I am making it, but I have spent hours going through the documentation, so I need help. From what I can tell, joint.shapes.standard.Circle elements cannot take an image as a background or fill. I would be really happy to use the .BorderedImage elements, but when I change the radius to make them a circle, the border changes without cropping the image. I also tried to use the .Image element and change the radius, and again the image didn't change. I am under the impression that I could add a clipPath definition to an .Image or .BorderedImage to force a circle, but I am not familiar enough with the syntax to be clear on where to do that, and none of the examples I have found on stackoverflow have given me enough information to do that. I tried using the .define method, and kept getting "cannot read property define of undefined" errors, so I know I wasn't using that right.
Here's what I have in the way of error-free code (rounded border that doesn't crop):
var graph = new joint.dia.Graph;
var paper = new joint.dia.Paper({
el: document.getElementById('myholder'),
model: graph,
width: 600,
height: 600,
gridSize: 1,
// makes code not draggable
interactive: { elementMove: false, arrowheadMove: false }
});
var borderedImage = new joint.shapes.standard.BorderedImage();
borderedImage.resize(100, 100);
borderedImage.position(100, 100);
borderedImage.attr('root/title', 'joint.shapes.standard.BoarderedImage');
borderedImage.attr('label/text', 'Monster\nImage');
borderedImage.attr('border/rx', "50%");
borderedImage.attr('image/xlinkHref', './assets/images/monster.svg');
borderedImage.addTo(graph);
The code I tried for .define looked like:
joint.shapes.Element.define('standard.BorderedImage', {
attrs: {
body: {
rx: "50%"
}
}
})
Some of the resources I have looked at and couldn't figure out how to use correctly are:
Putting multiple films in a circle in Raphael/Joint.js
How to set background image for a rectangle in JointJs?
Using predefined SVG file for creating a custom JointJS shape with ports
https://resources.jointjs.com/docs/jointjs/v2.1/joint.html#dia.Paper.prototype.properties
Long time lurker but never made an account. Just wanted to preface that I'm by no means a dev and just tinkering and experimenting for fun, so I apologise in advance if I seem really dumb.
I'm working on a dynamic overlay for Twitch streaming and was previously using AS3 but I've switched over to HTML5 now. I'm trying to load an image onto the canvas (which will eventually be a profile picture fetched using Twitch API... but one step at a time). I'm using Adobe Animate and I have the following so far applied in Actions on the first frame of the layer:
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
show_image();
function show_image() {
source_image = new Image();
source_image.src = 'https://cdn.sstatic.net/stackexchange/img/logos/so/so-icon.png';
source_image.onload = function () {
context.drawImage(source_image, 100, 100);
}
}
When I hit Ctrl+Enter and see it in Chrome, the image appears for the first frame then disappears. I'm not sure how I'm supposed to get it to stay indefinitely. I need to be able to animate it later, and it'll change depending on the latest follow/donation/sub, etc.
I tried extending the frame itself in the timeline, however, this just changed long how it took to loop and didn't make the image itself stay longer. I'm probably missing something really simple!
Any help would be appreciated. Thanks!
Your code is okay if your approach is using a canvas with HTML and JS, without any libraries involved. However, this is not the case, as you are using Animate, and the way to draw graphics with it is different than using default canvas methods like drawImage().
Animate includes the CreateJS suite, which includes the EaselJS library ,and this allows you to use another tools to draw to your canvas. Two or them are the Stage object, the visual container of your animate project, and the Bitmap object, who represents an image, canvas or video. For effects of this question, only both objects are required.
Note that the code below is only for the first frame:
/* It is not necessary to declare the canvas or stage element,
as both are already declared. At this point the stage is ready to be drawn */
show_image();
function show_image() {
var source_image = new Image();
source_image.src = 'https://cdn.sstatic.net/stackexchange/img/logos/so/so-icon.png';
source_image.onload = function(event) {
/* A new Bitmap object is created using your image element */
var bmp = new createjs.Bitmap(event.currentTarget);
/* The Bitmap is added to the stage */
stage.addChild(bmp);
}
}
I'm trying to make a custom avatar maker, where my users can drag & drop images to the position they want (clothes etc. I take the image urls from database based on what they own). Then they can save the look as png image to my site (using php). I have no experience on javascript/jquery but I don't think that this can be without them. So I've found amazing code for this from here:
http://www.fabiobiondi.com/blog/2012/10/export-and-save-a-screenshot-of-an-html5-canvas-using-php-jquery-and-easeljs/
But the images are already in the canvas and can't go outside of it, which is bad considering that someone could have 100 pieces of clothing and didn't want to display them all. Also I have to make custom code for each piece, which is also bad because not all users have the same images to drag.
Is there a way to put all images draggable (to the canvas), so I could easily add the image urls from my database as basic html/css? Is it possible that the images would be outside of the canvas first? Or should I create another canvas for the items users don't want?
the script in the article uses a static image because its goal is only explain how to export a canvas to bitmap : )
I have written another small article where I describe how to upload N images from your hard drive into a canvas ( using CreateJS ) so as you can see the process to load dynamic sources is not so hard.
http://www.fabiobiondi.com/blog/2012/10/upload-images-from-the-user-hard-driveto-an-html5-canvas-easel-js-application/
Anyway, if you need to load an image into a canvas you can simply use a syntax like this:
var img = new createjs.Bitmap('http://uri/image.jpg')
img.x = 50;
img.y = 50;
stage.addChild(img)
stage.update();
and if you need to know when an image is completely loaded you should listen for the onload event:
var image = new Image();
image.onload = onImageLoaded;
image.src = "http://uri/image.jpg";
function onImageLoaded (event) {
var img = new createjs.Bitmap(event.target)
img.x = 50;
img.y = 50;
stage.addChild(img)
stage.update();
}
hope it's useful
Background
I've got a bunch of svg's in a document (with rect, path, and whatnot inside each) and I need to draw this out to a downloadable PNG image. I understand that in order to do this there are two methods: either draw the page's HTML structure to a canvas and then export from there or render an SVG and its contents straight onto a canvas.
Hypotheses
The first hypothesis I tried to render the HTML structure using html2canvas and only found out that SVG's could not be rendered via an HTML structure at all (due to security issues). The second hypothesis I tried to render an SVG to canvas via canvg only to find out that it only allowed for one SVG element to be rendered and that only the first one would be rendered.
Results
To prove the first one wrong, type in http://www.w3schools.com/svg/tryit.asp?filename=trysvg_rect to this URL and disable Javascript. To prove the second one wrong I have a fiddle to try out.
The Question
I want to make it clear that my reasoning for having multiple svg's is so that I can place them within a responsive grid system and resize via aspect ratio. Without further ado, I ask my question: How can you render multiple svg elements to a canvas? If the answer to that question is "it isn't possible", then next my question would be: Should I be rendering one svg instead and handle responsiveness another way?
You should be able to draw SVG to canvas just as any other image:
var img1 = document.createElement('img'),
img2 = document.createElement('img')
count = 2;
/// image loading is async, make sure they are loaded
img1.onload = img2.onload = function() {
count--;
if (count === 0) drawImages();
}
img1.src = 'some1.svg';
img2.src = 'some2.svg';
/// when loaded, draw them somewhere on the canvas
function drawImages() {
ctx.drawImage(img1, 0, 0);
ctx.drawImage(img2, someX, someY);
}
That being said - there are a couple of restrictions:
FireFox currently does not want to draw images properly without width and height set inside the SVG file.
CORS (Cross-Origin Resource Sharing) applies if you want to extract images as bitmap (toDataURL/getImageData). If not they should work as normal.
I'm building a canvas user interface with jquery and fabric.js library and I set an overlay png image with a transparent section using the following code
var bgImgSrc = bgImg.attr('src');
canvas.setOverlayImage(bgImgSrc, function(img){
canvas.renderAll();
});
I also added an image behind the overlay and resized to fit the container using the following code
var photoImg = $('#img-photo');
var photoImgSrc = photoImg.attr('src');
fabric.Image.fromURL(photoImgSrc, function(img) {
var photoImgWidth = photoImg.width();
var photoImgHeight = photoImg.height();
var hRatio = 380/photoImgWidth;
var vRatio = 300/photoImgHeight;
var ratio = Math.min(hRatio, vRatio);
pImg = img.set({left: 380/2, top: 300/2, angle: 0})
img.scale(ratio).setCoords();
canvas.add(pImg);
canvas.sendToBack(pImg);
canvas.renderAll();
});
And it works as expected, however, when I click on the image to scale/resize it, I don't see the controls, except through the transparent space of the overlay image. Controls are behind the overlay image, is there a way to force show the image controls without having to put the entire image in front of the overlay?
Just set the boolean controlsAboveOverlay:
canvas.controlsAboveOverlay = true;
The problem here is that overlay image is rendered on top of objects' controls. This is expected behavior. Take a look at this wiki article, which shows the z-index of various things on fabric canvas and in which order they're rendered.
There are plans to add support for object controls that are always on top, as you can see from this ticket, but I can't tell you when that's going to happen.
You can also try using "after:render" callback and draw image manually onto canvas.
canvas.controlsAboveOverlay = true; //did the job... but:
I don't want to render controls above the overlay image (as overlay means overlay to me). I just want to render the stack exactly as described in Wiki (by default).
I just wonder...as described in the Wiki rendering-stack, the controls should be rendered on top of all objects (always visible by default), but they do not (look at kitchensink demo).
IMHO this behaviour should be set by a flag like canvas.controlsInStack = true.
By the way ... that thing is really beautiful!