I have used opencv to read png files (with no background) and convert them into pygame surface. Here are the two examples of how I did it:
Method 1:
character=pygame.image.load("character.png")
Method 2:
CharacterImage=cv2.imread("character.png")
CharacterImage=convertToRGB(CharacterImage,CharSize,CharSize)
#charSize is desired character size (for example: 50)
#I have created a user defined function as pygame renders in RGB whereas cv2 renders in BGR image format.
CharacterActions.append(rotate(pygame.surfarray.make_surface(CharacterImage),charrot))
#charrot is rotation angle
I understand that I could manually resize images and then use the first method to get the transparent background image. But I want to understand if its possible to obtain the same via second method? I don't want to manually edit so many images resizing them and that's why I want to know if there's a way for the same.
Thanks in Advance
On the images you load using your Method 1 (pygame.image.load()), you should use pygame.transform.scale() and pygame.transform.rotate() to manipulate the loaded image.
To maintain the transparency, you need to keep the alpa of the image you are loading. To do that you need to use .convert_alpha() on the resulting image. You can do that after or before the transform.
For each of these commands I have linked them to the documentation, just click on them so you can read it.
Related
I'm writing a 'template creation' app using the dcc.Graph image annotation features in Plotly Dash.
The user adds multiple rectangles for specific features in the image (an invoice) and my callback captures the coordinates of each rectangle via the relayoutData variable. I want to use a different color for each rectangle, but can't figure out how to do it.
It seems like the only way to change the newshapes fillcolor
property is to replace the whole figure, but then I lose all previous shapes
All and any help appreciated.
Andrew
I have just found the following demo that does exactly what I am trying to do:
https://dash-gallery.plotly.host/dash-image-annotation/
Now to unpack the logic and adapt it to my context ... Happy 2021!
Andrew
I want to load a specific part of an image in pygame.
How do I do it?
I have an image of a character in different angles. In SDL we use a rect, but do we have this option in pygame?
https://www.pygame.org/docs/ref/surface.html#pygame.Surface.blit
use the surface.blit(source, dest, area=None, special_flags = 0)). the area argument will allow you to put a rect of what part of the image that you want to draw
Is it possible to get the color (rgb-value and transparency) of a point (x/y-coordinate) from the canvas? Example: I draw some figures and text on a canvas and later I want to get the color of a point at a specific coordinate.
The solution should be independent whether the canvas is visible on screen or not. And it should work independently from the operating system.
I didn't found any solution on the web. That's why I assume that this is not possible. Am I right?
The canvas isn't very pixel-based, and provides no API for doing this.
But if you've got the tkimg package installed, you can use that to do a screengrab of the canvas and then fetch the pixel value out of that.
package require Img
# Get the data into an image
set screengrab [image create photo -format window -data $theCanvas]
# Read the pixel data out of the grabbed image
set pixeldata [$screengrab get $x $y]
# Get rid of the grabbed data once you're done
image delete $screengrab
Note that the coordinates concerned will be viewport coordinates, not canvas internal coordinates: if you've scrolled the canvas, you'll have to offset as necessary.
You are correct, tk does not provide any way to get the color of a specific pixel on a canvas.
After (probably) deciding on the jQuery map plugin to use (see What jQuery map plugin allows specifying the color of the pushpins?), I now need png files of colored pushpins.
I found a dandy one here: http://www.fuzzimo.com/free-vector-post-it-notes-push-pins/ :
...but it appears to be, not a collection of various png files I can use (blue.png, red.png, chartreuse.png, etc.) but one humongous .png file with an array of images. So I'm guessing this is meant to be used as a sprite. Being a sprite newby, though, I don't know how to use this image and specify the section of it that I want to use.
Specifically, the jQuery code I'll be using to set the marker's icon is like:
icon: '../img/apartment.png'
...how can I specify usage of a specific pushpin?
Is it possible to have a single SWF file with multiple "stages" appearing at different parts of the page and sharing data?
What I'm trying to do requires sharing big amount of data (byteArrays of image data) that cannot be shared through LocalConnections or via JS (very slow) so I'm trying to avoid the "sharing" part and somehow do it in a single SWF. Problem is, those images need to appear on different parts of the page thus I'm stuck.
There is only one Stage in swfs - the Stage is effectively the background; and you cant have more than one background.
"Problem is, those images need to appear on different parts of the page" - why cant you adjust the position of the images?
Use swf 100x100 % of browser window with transparent bg (wmode='transparent'), load images and place them in appropriate position. Main problem how to calculte coordinates for thumbnails... ^)
And flash with transparent bg very slow too...