I have an IKImageView in NSScrollView.
Now, I have two problems:
When I show a large image and zoom it, the animation loos very crappy. Is there a way to get it to switch images more smoothly?
When the image is zoomed bigger then the IKImageView, zoom - centerPoint lock on left - bottom of IKImageView. How can I set the zoom - centerPoint?
Thanks
f91kdash
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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've created an image in Photoshop to be used as a sprite in Unity and everything works fine while the sprite is scaled at X: 1; Y: 1.
The problem starts when I scale the image up as the border of the image stretches out with the rest of the image. Is there any way to scale an image from its centre or to ignore the image's border when it's scaled?
Here's the example now that I am able to show it:
The rectangle on top is the original image without being scaled up or down and the rectangle on the bottom is scaled at X:5, Y:0.5 but the borders are stretched.
I think that the borders are stretched because it's part of the image and when it's being scaled, the image (including the borders) is just being stretched.
Is there any way to stretch the sprite image but by ignoring the borders?
Are you trying to scale the image and keep the original ratio?
If so, here are the steps:
Hope this helps. Please let me know if you were trying to do something else.
You can use a sliced sprite. The center of the image is scaled to fit the control rectangle but the borders maintain their sizes regardless of the scaling. Check out the Unity doc here: Unity - Manual: Image
uiimageview -> uiscrollview -> uiview
it's work find for zoom image with gesture method.
but after zoom in imaged. it's image bad quality.
How to reset best image quality depending on zoom in/out scale.
The image quality is going to depend on the original pixel dimensions of the image. If you scale over 100%, you're going to notice a blurring of detail.
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.
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.