I was wondering if and where I can change the dimension of the canvas in jsPlumb, the place where all my draggable elements are?
You can use simple jQuery to change the dimensions of any DOM element.
jsPlumb isn't really a canvas thing, it creates DOM objects to represent the graph.
$("#jsPlumbContainer").css('width','+=100');
$("#jsPlumbContainer").css('height','+=100');
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I am using fabric.js for html 5 interactive canvas app. If the object scales larger than the canvas, the controls go invisible outside canvas. How to make it visible outside the canvas or is there a way to style those controllers in css.
So, in fabricjs controls are rendered on the canvas, so having controls outside canvas it is not possible.
You can still obtain the effect in this way, this is just a trace.
Make canvas big as 100% of window, or anyway very bigger than drawing area.
Then you can clip the drawing canvas with a rectangle.
If you need borders to define the drawing area you can still put an overlay image as fabricjs allow you.
If you need to have controls near the drawing canvas you will have to position them OVER the non drawing part of the canvas.
This will give you some additional tasks:
When you create some object you have to be sure that they go in the drawing area. If you consider position of objects, you have to consider that a translation has to be applied, because you have absolute position while user will position the object watching a fake top left corner of a drawing area and not the top left corner of the canvas.
The best thing you can do is make a larger canvas, but limit the drawing area to a limited part, like a margin. Not easy because after that you always need to consider the margin when making other calculations, but it is possible.
I am visualizing a graph using Three.js and for each node of the graph I add a label using TextGeometry. It is a pretty small graph but when I add text my application gets really slow. What should I do about it?
TextGeometry is more suitable for cases when you are really interested in rendering the text in 3D. It will create complex geometry that will surely slow your app down specially when there is a lot of text or you use CanvasRenderer.
For labels, it is generally better to use 2D labels, which are way faster to render. There are many different approaches to this. These can go on top of the Three.js rendering canvas, on a separate canvas, or even normal HTML nodes positioned using CSS properties. Alternatively, you can dynamically create small canvases of your label texts, and use them as sprite textures always facing camera - this might be the easiest way as the labels would be part of the 3D scene as your other objects. For a separate layer approach, you need to use unprojectVector or such to figure out screen XY coordinates to match your 3D scene positions.
See these SO posts for example:
- Dynamically create 2D text in three.js
- Canvas and SpriteMaterial
- How do I add a tag/label to appear on top of several objects so that the tag always faces the camera when the user clicks the object?
A transition animation between various Cells of a GridView is simply possible with RepositionThemeTransition.
But in my case, I need to move Elements from one GridView to another one.
is it possible to animate a transition while moving an Element (e.g. an Image) from one GridView to another?
I have started learning CANVAS. After i started drawing some basic shapes, i wanted to make some modifications to them. For example, I am confused of how to modify length and width of rectangle. Should i have to clear the canvas and redraw or can i capture the object of that rectangle like the objects in java script.
The canvas is a raster graphics surface. modifying length and width of a rectangle is a vector action. It is possible to scale a raster, but losses in quality can/will occur. You can use vector graphics in the form of SVG. But if it is only a rectangle, use a div with a border overlay-ed on your canvas.
Is this combination possible? I have a retro-style spritesheet, however I'd like to use SVG with it in order to apply some effects such as shadows, outlines, and other things. Don't question it.
I know canvas is an alternative, however for this project I'd prefer to use SVG. One major issue is in the way, however: taking individual sprites from a spritesheet. Additionally, I use 1x1 pixel sprites but enlarge the spritesheet to make them 6x6 via hidden canvas, so I'm also working with an image element as opposed to linking to an image outside of the page.
Is it possible to choose regions of the image to use in SVG? The SVG image element doesn't appear to offer such options.
You can use a clipping path with your image, clipping exactly to the contents you want. For example:
http://phrogz.net/svg/image-spritesheet.svg
If you're only targeting Firefox, you can instead use: image-spritesheet-simple.svg
Alternatively, you can place your <image> in a new <svg> element inside your SVG. The inner <svg> establishes a new viewport, and you can then use the viewBox of that to only display a rectangular region from your image (more like a normal sprite sheet).