I have an image in WPF which I would like to enlarge to a fixed width (say 800px).
The image should stretch to this width using the original aspect ratio (so not as to distort) and the height should be scaled as necessary.
If the height is not too large for the container the top of the image should show at the top of the container. The image should then slide upwards until the bottom of the image reaches the bottom of the container via an animation (so at some point the whole image has been displayed).
Links or suggestions highly appreciated
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I have a fixed container of 100vh x 100vw that contains 6 absolutely positioned divs that are 100vh x 100vw.
I use a dummy element that is positioned relative w/ 6 divs that are 100vh to trigger each scene.
When I resize the window, the scene's animation moves forward and backward in time. Is there a way to prevent that from happening?
The issue is that when you resize the window, the position of the scroll bar remains fixed at an absolute number of pixels. However, because your content is based on view height, the height of the document changes dynamically as you resize the window. Thus, the window scroll position as a percentage of the document body height is also changing, and this is what ScrollMagic bases progress on.
To illustrate with simplified math:
A) Given a window height of 1000px, your document height will be 6vh * 1000px = 6000px tall. If your window scroll position is 1200px, you'll be 20% of the way through the overall ScrollMagic timeline.
B) If you resize the browser to 800px tall, that changes the document height to 6hv * 800px = 4800px tall. However the window scroll position will remain at 1200px, which is now 25% of the way through the ScrollMagic timeline.
The simplest solution is probably to keep your document a fixed height.
I'm in the process of making a WPF program that:
can scan a bitmap image, pixel-by-pixel, and assign it a data value (0-255)
design a class that allows panning and zooming of the picture
create a histogram, from the data values, that overlays the bitmap image.
I was able to do all three, however the issue that I am having is that the histogram doesn't dynamically (I think that's the word for it) stretch as I re-size the main window. Actually, nothing stretches to the correct size in the main window (the bitmap image just re-centers itself while keeping the same size). The histogram originally started as a transparent canvas that had many rectangle children. I changed it to a grid but am getting the same results as the canvas; the rectangles don't want to stretch horizontally or vertically. If I do set a horz/vert alignment the histogram disappears altogether. Can anyone help with this problem?
I ended up making a class that was a derivative of the canvas class i cave it some rendering overrides and a paint method that took into account the actual width and height of the window.
I have an Image control with Stretch==Uniform which means larger images will be scaled down. In my case the Image control fills the whole client space, the scaled down image is being displayed centered inside the control. What now will happen: the size of the rendered image and the Image control do not have the same size - the Image control is usually larger than its content (since I use uniform stretching).
I now need to know the position of the actual image inside the Image control. Some background: the user can place a rectangle on the image to crop it. To match the rectangle with the image coordinates I need to know exactly where the image is.
Is there a way to determine the position of the rendered image inside the Image control? Or is the only solution to make the control the same size as the image content?
To get more control, you might want to put the image on a canvas inside a viewbox.
That way you get pixel control via the canvas, but a scaled view via the outer viewbox. Set the canvas dimensions to match the image and add any decorations to the canvas.
You may need to inverse-scale the rectangle stroke width so that it is visible when the canvas is small.
Ok .. so here's the scenario. I've got a WP7 silverlight app, that loads an image from the net. Now, these images will be taken from mobile devices, so they may be in portrait or landscape mode. Certainly not a square.
Is there any way to maintain the aspect ratio when I show these in a silverlight <Image> control?
I'm ok with either of two resolutions:
That the image shows up in its correct aspect ratio within a predefined box that I've defined in xaml
Or that the image is cropped into the square
The way silverlight was built, you can set the width OR the height on the image, it will automatically max out whatever property you set and calculates the other side of the image so that it keeps the aspect-ratio.
So, just set a width on the image and center or right,left,top,bottom align it. (do not stretch it).
I have an Image, which I need to scale based on the image's pixel values.
When I create the bitmapImage, the pixels (height and width) are both 0.
Is there a way to get height and width before the image is drawn to the canvas?
I had a similar issue where I needed to measure the height of a row (with content) being added to a Grid before adding it to the Grid. Short answer - it can't be done.
Long answer - it can be done. In my code-behind, I created a dummy Grid not a part of the UI. I would add the row to it, and then call .Measure on the dummy Grid that would give me the rendered size of the row. Then I could just add the row to the actual Grid on the UI.
I suspect you could try the same approach with your image. Create a dummy Canvas, add the image to the Canvas, and see how big it is.