I have a class that extends CustomPainter, which helps me to draw an image on the canvas (with canvas.drawImage) and plot some points (with canvas.drawLine and canvas.drawPath) on top of the image. However, I have trouble figuring out how to scale or translate the image so that it fills / covers the canvas (about 60% of the image from the center should be displayed within the screen size of the device). The image can be bigger or smaller than the device's screen size, but they all have a fixed aspect ratio (4:3). I would like to fill the image on the canvas (following the 60% rule above) and scaling them according to their original aspect ratio.
A pseudocode or a general idea on how to do this would be appreciated.
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First of all, sry for my English mistakes, I'm not a native English speaker.
I'm trying to make an UI which is composed of a canvas within different gameObject, and I would like that my canvas scales to the dimension of the screen but keeps its original resolution (16x9 portrait). If it is displayed on a tablet resolution (4x3) then an image is displayed in the space that is not covered by the canvas.
But actually all I've got is a canvas which scales to every resolution, and it changes the aspect of its child (for example a square becomes a rectangle).
Thank you for showing interest in my query!
UI's are heavy beasts. Canvas in Unity have a component attached to themm called Canvas Scaler which is set by default on Constant Pixel Size. You may try to set this property on Scale With Screen Size and then specify the base resolution you want to work with (usually 1920x1080 is a console standart). This is your first step
Then, to avoid strange Image scaling, you may check the property Preserve Aspect, this way the ration of the Sprite into your Image will remain the same indepently of the ratio of the Image
Last, you may play a bit with anchors but this is another story, you should let those at plain center at the beginning and come back to it when you will feel ready
Hope that helped ;)
Your canvas should have a component called Canvas Scaler. Here it should say Constant Pixel Size, change this to Scale With Screen Size and it should lock the Canvas to be the same width / height as the screen. If you want to lock an image to a specific width/height ratio, go to the Image component on the image and check the Preserve Aspect checkbox. This way if you have a 100x100 image, the images width will always be the same as the height. If you have a 200x100 image, the images width will always be twice the height, etc etc etc.
I making a 2D game in unity. And I want to make my game responsive to different resolutions, and when I use Canvas Scaler all my UI objects become very bigger.
if you can help please response.
thank you!
Designing UI for Multiple Resolutions
1. Using anchors to adapt to different aspect ratios
One way to keep buttons inside the screen is to anchor them to their respective corners,
One way to keep the buttons inside the screen is to change the layout such that the locations of the buttons are tied to their respective corners of the screen.
Once the buttons have been anchored to their respective corners, they stick to them when changing the resolution to a different aspect ratio.
When the screen size is changed to a larger or smaller resolution, the buttons will also remain anchored to their respective corners. However, since they keep their original size as specified in pixels, they may take up a larger or smaller proportion of the screen.
2. Scaling with Screen Size
In the Canvas Scaler component, you can set its UI Scale Mode to Scale With Screen Size. With this scale mode you can specify a resolution to use as reference. If the current screen resolution is smaller or larger than this reference resolution, the scale factor of the Canvas is set accordingly, so all the UI elements are scaled up or down together with the screen resolution.
The layouts will appear the same in different resolutions, only with a lower pixel density depending on if you scale up or down.
One thing to be aware of: It can be possible that some element are larger in landscape aspect ratio. This can be fixed if you change the Match property to 0.5 instead, it will compare both the current width to the reference width and the current height to the reference height now.
Unity Documentation
I am trying to making a sniper zoom using unity. When user zooms i want to show
Sniper Scope image.
I simple place the image in Unity Image Component.
Here is the image example
The image stretches like this.
How can i maintain the aspect ratio. There is once option for saving the aspect ratio but then it removes background from top and bottom
I have a Unity 2D project with a fixed screen size of 800x450 pixels.
I have imported a background image that is also 800x450 pixels.
When placed on the stage, the image only takes up half of the screen.
The scale of the image is set to 1,1. The Z position is 0.
Why is the image displayed too small? How can I display the image at the correct resolution?
Does this mean that I have to design all my game assets at 2x the required size? Or that I somehow have to set the scale for all imported assets at 2? What is the recommended workflow?
EDIT
I have added a screenshot of the camera settings:
I would trying making your camera orthographic, and set the size of the camera (not the transform) to be half the height that you would like it to be (225)
Also if you are looking for pixel perfect game. here is a pretty good article from Unity about how to make that work and it explains some of the camera aspect ratios and scaling
http://blogs.unity3d.com/2015/06/19/pixel-perfect-2d/
I am using a image view and its size is (320X480). i want to fit a image which size is (800X600) in image view without stretching the image. i tried to make the image 320X480 but its quality becomes poor. Thanks for any solution.
320x240 would be the same aspect ratio. Notice, 800/600 = 4/3 and 320/240 = 4/3.
Also, in the future a tool like ImageMagick can allow you to resize an image to fit within some bounding box while maintaining aspect ratio.