I want to put some images on the screen.Then i choose openseadragon plugin to help me.
But i have two questions by using it.
Each pic is 256*256 size，but on my mac, is always biger than 256. As below pic shows.
I open it on other screens which is bigger than mine, it also show me bigger.
Maybe is the same quesion as question above.
Can any body give me same help?
Thanks very much!
Actually it should be 256 * 256, but acutally 264.74 * 264.74
Is similar to 256,but still bigger.
The closest you're going to get to displaying tiles with a 1/1 ratio of image pixels to screen pixels is by setting the viewer zoom correctly. Since viewer zoom is based on the width of the image, you'll need that value to compute it...something like:
viewer.viewport.zoomTo(imgWidth / viewer.container.clientWidth);
Related
Trying to simply display an image at it's full size, which is bigger then the screen width and height. I do not care because I am developing a page for pinch and pan. So, the image will be off the screen anyways, and I would like to use a bigger image for pinch and pan, and it keeps setting the width to screen width when I just want it to show at real height and width. I've tried absolute layout, relative, and stack, nothing works. Here's my current code:
<controls:GestureFrame x:Name="GestureFrameMain">
<Image x:Name="ImageMain"/>
</controls:GestureFrame>
and in the backend, I simply set the source:
ImageMain.Source = Xamarin.Forms.ImageSource.FromUri(new System.Uri(PageParametersImageZoom.Image.BigImageURL));
I can verify that the URL has an image that is much larger than the screen size, here's an example of an image that would come back:
http://www.stage.newser.com/image/1088966-0-20161020082458.jpeg
And as you can see it's much larger than the dimensions of the screen, however, when I set the source, the image appears to be at screen size. I've attached an image of the result on the page, which clearly shows the image being downsized by Xamarin.
EDIT the pinch and pan itself is not the problem. When I pinch/pan the image obviously gets larger and goes off screen. I am talking about the initial load of the page, I would like the image to show at its real size.
Looks like the only way I was able to do this was by using a AbsoluteLayout and specifying the widhrequest/heightrequest properties on the image.
I was trying to use a coloured texture (PNG 24/RGB) for a POI (bicycle_parking) and it was not being rendered. It was added properly as a texture, it just won't be rendered on the POI.
After some testing I came to believe that POIs only accept grayscale textures that can later be filled up with a color. Is this right?
I also found out that the icon needs to be of a specific size (I got it working only at 32x32 pixels and 512x512, but the scaling did not make it look good). Is there any information regarding this?
Now I have a grayscale icon (mostly white) but the fill color does not change the white as expected. This is as far as I got..
Here's a set of icons similar to the ones I need to render into POIs
How could I achieve adding this type of icons as the texture of a POI? Workarounds/hacks are welcome as well :)
Thanks!
The texture of the Poi must have a size that is a power of 2 and goes from 32x32 up until 512x512. Also make sure that the colour code of that image is RGB anything else wont work. For the best visual result you have to create 3 sets of pngs for different screen densities, for example see heatmap_legend.png then look at heatmap_legend#2x.png and heatmap_legend#3x.png, you can find them in the "common" folder.
So turns out that the color wasn't a problem after all. It was quite tricky to get one image working, but once I had the image working, adding color to it and saving the PNG worked just fine.
The problem with the image size I experienced is still happening. You need to export it in 32x32, 64x64 or 96x96 in order to StyleEditor not to crash when opening the file.
Thanks for reading this question :)
Goal:
I am using Fabric.js as a base for image editor (crop and resize features for now mostly).
My goal is to load some high-quality image (like photos) rotate or crop it and then export as DataURL (in original quality or near to it).
Solution:
To add such a big photo on canvas and be able to export it bad with the same quality - I set width and height of canvas equal to image's width and height (2560 × 1600px) and then compress it using css to 640x400px (editor size). (I used https://stackoverflow.com/a/17035046 as a base)
In this case I still can export image in big dimension using canvas.toDataURL() - it will be about 2560x1600 (this is my goal).
How it works: http://jsfiddle.net/handmade/Lqsb0kwv/4/
Problem description:
I've got a problem after adding zoom feature (canvas.zoomToPoint(...)) to my editor and it is related to css width and height limitation of canvas.
Try to change size of image using controls in jsfiddle above and you will see an issue.
Works fine if...
...if I don't use css limitation: http://jsfiddle.net/handmade/Lqsb0kwv/5/
Questions:
I've read 90% of Fabric.js docs, examples, tutorials, questions here on Stack Overflow, but I didn't find a solution for my issue.
I am not sure that using css to limit canvas is a good practice.
I am not sure that my way of getting back changed image in big dimension is a good way.
Does anybody know better way to export image in good dimension?
Does anybody know if issue with scaling/rotating image after zoom (+limited by css) is a bug in Fabric.js?
Thank you for any answer!
I have to reduce the dimensions of a JPG image to exactly 350 * 450 pixels.Please tell how do I do so.My JPG image is of dimensions 392*520 pixels.
UPDATE:
Ok, thanks for the answers . Checking them now.
Thanks.
You can't do that with a linear operation, the ratio of the image will be skewed.
There is nearly 3 % absolute difference, I don't know how much that is to the human perception.
350/392 = 0.8929
450/520 = 0.8654
I would recommend scaling it to 89% and then cut the rest of the image to get your 350 * 450. This way you would keep the ratios intact.
You can use paint. Go to the resize button (on top of the rotate button) and click the radio box that says pixels. Choose the amount of pixels you want.
There are many online resize tools, e.g.: http://www.picresize.com/
Upload your image, enter its new dimensions and download it again.
I draw some text on screen using ID3DXFont::DrawText. This text should be displayed the same regardless of screen resolution.
For example, if screen resolution is low, text wrapped and when it is higher text is not wrapped. How can I avoid such situation? I want text size to be connected to screen resolution so if resolution is lower I want the text to be relatively smaller so that no wrapping happens. Is there any way?
Thanks in advance
Below is a logical solution. It doesn't have any of the code or procedures needed to make work in direct X but having done something similar outside of DirectX I wanted to share the logic
Working on whatever default screen resolution you want set the font to be the size needed.
Find the percentage of the screen height the font size you chose takes up.
Then having stored that value when you go to render again, in the final version of the program, calculate the font size based on the screen size and the percentage
What I was working in had functions like GetTextHeight and properties on the font size to allow you to set the height (which in turn set the font size appropriately). So if can find anything similar to this in DirectX than this could be a route for you to take.