hi
how can i let the user to crop his picture before choosing one
in the photoChooserTask?
( in msdn it says that the pixelheight/width doesn't work yet)
thanks
You would have to do the pixel operations yourself after the image has selected. You can render the image to the screen, and then look for two touch points to determine the x/y and height/width ... then create a new texture with those dimensions and render to it as a RenderTarget. You can then save this new texture, or do whatever you need to do with it
Not sure if Windows Phone 7 can handle RenderTargets but if it can. You can just have the user drag a rectangle, create a RenderTarget of that size, and then draw to the RenderTarget using the rectangle as the source rectangle of the image you want to crop.
Related
I am getting my feet wet with JavaFX, and have a simple drawing program which writes to a Canvas using a PixelWriter. The program draws a pixel at a time, reflecting each pixel over a number of axes to create a growing and evolving pattern centered on the canvas:
The Canvas is in the Center region of a BorderPane, and I have written the code to resize the canvas when the application window is resized. That works OK.
However, I would like to re-center the image on the new resized canvas so that the drawing can continue to grow on the larger canvas. What might be the best approach?
My ideas/attempts so far:
Capture a snapshot of the canvas and write it back to the resized canvas, but that comes out blurry (a couple of code examples below).
I dug into GraphicsContext translations, but that does not seem to move the existing image, just adjusts future drawing.
Maybe instead of resizing the canvas, I make a huge canvas bigger than I would expect my app window to be, and center it over the center region of the border pane (perhaps using a viewport of some kind?) I'm not thrilled about the whole idea of making some arbitrarily huge canvas that I think will be big enough though. I don't want to get into scaling - I am using PixelWriter so that I get the crispest image without antialiasing and other processing.
My snapshot attempt looked like this, but was blurry:
SnapshotParameters params = new SnapshotParameters();
params.setFill(Color.WHITE);
WritableImage image = canvas.snapshot(params, null);
canvas.getGraphicsContext2D().drawImage(image, 50, 50);
The 50, 50 offset above is just for my testing/learning - I'll replace it with a proper computed offset once I get the basic copy working. From the post How to copy contents of one canvas to another? I played with the setFill() parameter, to no effect.
From the post How to save a high DPI snapshot of a JavaFX Canvas I tried the following code. It was more clear, but I have not been able to figure out how to find or compute the pixelScale to get the most accurate snapshot (the value 10 is just some number I typed in bigger than 1 to see how it reacted):
int pixelScale = 10;
WritableImage image = new WritableImage((int)Math.rint(pixelScale * canvas.getWidth()),(int)Math.rint(pixelScale * canvas.getHeight()));
SnapshotParameters params = new SnapshotParameters();
params.setTransform(Transform.scale(pixelScale, pixelScale));
params.setFill(Color.WHITE);
canvas.snapshot(params, image);
canvas.getGraphicsContext2D().drawImage(image, 50, 50);
Thanks for any direction y'all can point me in!
I was wondering how to draw bounding boxes around objects in an image using FLutter.
Neither Image picker nor Image cropper does it.
I would like to let the user select an image from gallery (done) and would like to let him draw boxes around objects and use it in the code.
Thanks for the help
I recently encountered a problem with UI. I opened a new 2D project and created a canvas with a GameObject with a Image component. I then added a sprite by right-clicking Assets > Create > Sprites > Circle. This added a circle sprite to my Assets folder.
The problem is when I choose the Source Image for the Image component as the circle, it still displays as a rectangle.
The circle sprite is imported as Sprite for Texture Type.
This problem also happens with the other shapes, such as triangle.
I am using Unity 5.6.0b9 Personal. Build target is PC, Mac, Linux Standalone.
I am probably missing something very simple. Any help is appreciated!
It doesn't work like that. Circle and all other type of Sprites under the Assets > Create > Sprites Menu are only made to work with SpriteRenderers. This would have worked if you used SpriteRenderer from GameObject--> 2D Object--> Sprite. They do not work with the UI.
For the UI, this has to be done with the Mask component. Just get any round image then use it to cut out circle from your target square image.
Create a UI Image called "TargetSquare" which is the image you want to round.
Duplicate it then name this "MaskCircle" and then resize it to make it smaller than the "TargetSquare" until that circle shape is what you want.
Make the "MaskCircle" object to be the parent of the "TargetSquare" object then use this round Sprite I made as it's source image.
Attach the Mask component to the "MaskCircle" object.
Done. Your "TargetSquare" object will have the shape of the "MaskCircle" object.
If you get jagged edges, select the sprite you used for the "MaskCircle" image and then make sure that Mipmap is disabled.
Maybe it is bug, in unity 5.6.1f1 same story.
Just try to download new version unity 5.6.2f. I dont know, that bug is fixed or not.
Or
Use some image editor, for example photoshop.
P.S. My fail, all ok, it works on SpriteRenderer component. Unity generates white square, and in this sprite properties setting Sprite Mode to Polygon and creates some shape using vertices.
I'm making a game were you can set the background image yourself.
The selected image is resized to make it fit the purpose, and then i want to load the picture into pygame.
I've something like:
image = Image.open('file')
image.thumbnail(size, Image.ANTIALIAS)
And now I want to load image into pygame.
of course I can use:
image.save(outfile, "JPEG")
background = pygame.image.load('outfile')
Is there a nice way without having to save the image to my hard drive?
Or is it possible that pygame resizes the image?
You can use pygame.transform.scale() to resize an image:
pygame.transform.scale()
resize to new resolution
scale(Surface, (width, height), DestSurface = None) -> Surface
Resizes the Surface to a new resolution. This is a fast scale operation that does not sample the results.
An optional destination surface can be used, rather than have it create a new one. This is quicker if you want to repeatedly scale something. However the destination must be the same size as the (width, height) passed in. Also the destination surface must be the same format.
So you don't have to use PIL.
First of all I will explain my situation so you can know my problem a little better. I'm making a HTML5 app. I have a canvas, and using a color picker you can change the color of the canvas. Now i have a picture which I want to put on the canvas but that pictures color needs to be changed using a color picker. So i need to replace, lets say, black color on that picture and put it on the canvas so it dosnt screw up the background.
So that will look like this:
1st color picker- changes the color of the canvas
2nd color picker - replaces the black color on the image with the one in the color picker and puts it on the canvas
Now my problem is how to replace the color on the image without reloading the page.
My only condition is no using silverlight, flash, java or any other similar tehnology that need 3rd party software to be installed on the device.
Thanks in advance.
If you dont understand my query fully, feel free to ask.
My approach with a JS only solution could be:
Loading the image inside a canvas element. Look at the MDC canvas tutorial
Trigger the user click on the canvas and get the pixel color (see links below to know how to get the color of a pixel) and look at this answer to get the mouse position
Substitute all the colors in the canvas with the one the user pick. For some examples about pixel manipulation:
Pushing pixel with canvas at Mozilla Hacks
http://beej.us/blog/2010/02/html5s-canvas-part-ii-pixel-manipulation/
This JS at mezzoblue apply heavy filter to an image
After some canvas experiment I notice that mostly in all the browser the pixel manipulation with canvas could be very slow also with small images. So another experiment to do could be to get the pixel color and then:
pass the color information to a PHP (or another server side script) with an AJAX call
do the color manipulation with an image library like GD or imagemagik
return back your image with the Ajax response
reload your canvas with the modified version of the image