I am using Leaflet to overlay SVGs on top of the map. These SVGs are positioned to exactly overlay on a location such that it covers it perfectly. Think of overlaying a running track with a custom SVG.
To overlay, I am using L.imageTransform as I need to transform them. L.imageTransform extends L.imageOverlay to overlay the image (should I use SVG overlay, not sure?)
The problem is, on some of the overlays, when I zoom in, the SVG gets blurry and it loses its detail that we want. Blurry locations differ in Firefox and Chrome, and are randomly blurred. A sample blurred image can be seen below:
This could either be a browser issue or could be due to the scaling of map tiles. Any ideas?
Related
I'm using a prefab for a box shape, which has a front and back plane.
My images are PNG and have transparent areas around the edge. I dragged the image onto my front plane, which now has a drop-down box for "Shader".
First I chose Shader: "Standard" but the transparent areas of my PNG image weren't transparent, so in order to fix that I changed it to "Sprites / Diffuse"... now the image looks fine (from the front).
However, when I rotate the shape, the image is also visible from the back. I want a way to not see the image / texture from the back.
How can I make the images only visible from the front side of a plane, whilst also preserving the transparency areas of the image / texture?
If you are using the standard built-in shader, you need to set the rendering mode to transparent in order for the texture's alpha channel to be transparent. The sprite shader, by default, forces the rendering of otherwise invisible back-faces, whereas the standard shader does not.
I am trying to render a few images in NSImageView's. These images are much larger than the size of the NSImageView (which I have set to scale proportionally up or down). But, the rendered image don't look very good. For example, in this sample image, the white border seems to have jagged edges at the 12,3,6 and 9 o'clock positions. The source image seems to be fine, even when I zoom out all the way in Preview.app.
I have tried scaling the image myself (using MGCropExtensions - which sets the interpolation quality to High), but, it doesn't seem to help. I would imagine NSImageView would internally draw on device boundary automatically, so that shouldn't be an issue?
Any ideas on how to get the image rendered crisply in the NSImageView? Thanks
Source Image - It has a white border which doesn't show here (against the white background)
Rendered NSImageView screenshot
I have been looking to dynamically scale a image map with coordinates to a div, so when re-sizing a window occurs the map and all coordinates are scaled accordingly.
any suggestions on how to do this?
i think this may work
http://blog.outsharked.com/p/image-map-resizer.html
but with the alternate option of :enter a bounding area and the map will be clipped to within that area.
my question then is how do i establish a bounding area, will it scale dynamically to that whole area?
This jQuery plugin works great for scaling and rescaling image maps on the fly. You can call this once, and it will take care of all image maps on the page. It will even rescale an image map if something happens that changes an image's dimensions.
https://github.com/stowball/jQuery-rwdImageMaps.
If you weren't just using the div to solve the image map scaling problem, you could put a blank image (a completely transparent .gif or .png) in your div with the image map applied to it and set its width and height to 100%.
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).
If have an image which is 1024x1250 and a canvas element that is 600x800, I can draw the image to the canvas centered such that the canvas is essentially a smaller view port of the larger image. I then want to allow that center point to move, thus creating the illusion that the viewport is viewing a different portion of the image.
Right now I've done this in sort of a hokey way where I redraw the portion of the image I want to see to the canvas, but I get this feeling that this isnt optimal. Is there a way to render the whole image to the canvas and then somehow "transform" my current center point so this view shift happens behind the scenes hopefully in some native layer?
You can add transformations to the context before drawing any image (rotation, scaling, translation...). What you need is the function context.translate(x,y).
Then, you only need to draw your image at (0,0)
For example, to display the bottom right portion of your image:
ctx.translate (-424, -450);
ctx.drawImage (image, 0, 0);
You can check this link https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Canvas_tutorial/Transformations to see a lot of examples on context transformation.