Image Of For even width values the thickness of each line grows with the original line being offset from the center as there is no exact center line drawn. Draw a rectangle we can draw a rectangle using the pygamedrawrectsurface color rect width0 method.
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I have had this question as a pygame user before and this is a method of solving your problem.
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Pygame draw rect transparent.
Color represents the color of the rectangle in rgb format with components in the range 0 255.
I tracked this down to the way alpha transparency works in surfacefill vs the pygamedraw functions drawrect and drawpolygon marisas master spark uses the latter producing drawings that are more transparent than desired.
For odd width values the thickness of each line grows with the original line being in the center.
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The following code produces differences in pygame and pygame sdl2.
All functions takes a surface to draw on a color and a position argument thats either a pygame rect or a 2 element integerfloat sequence the pygamedrawcircle will only take integers because of undefined reasons.
You should create a rgba surface and fill it with the semi transparent color.
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Check the surface docs at the pygame site especially the intro.
Blue 0 0 255 255 pygamedrawrectmyimage blue myimagegetrect 10 unlike the other surfaces this surface default color wont be black but transparent.
Surface represents the surface where the rectangle is going to be drawn.
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Pygamedrawrect documentation doesnt state support for alpha channel.
Set the current alpha value for the surface.
When using width values 1 lines will grow as follows.
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Any pygame function that requires a rect argument also accepts any of these values to construct a rect.
The surface will now draw transparency if the color contains the fourth alpha value.
Also consider using pygamehwsurface to create the surface hardware accelerated.
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In pygame both kinds of functions match up.
As a result lines with a slope 1 horizontal ish will have 1 more pixel of.
Draw a transparent rectangle in pygame.
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If none is passed for the alpha value then alpha blending will be disabled including per pixel alpha.
When blitting this surface onto a destination the pixels will be drawn slightly transparent.
This makes it easier to create rects on the fly as arguments to functions.
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Rect pygamesurface100100 pygamesrcalpha 32 rectfill23 100 255 50 screenblitrect 100100.
The alpha value is an integer from 0 to 255 0 is fully transparent and 255 is fully opaque.
The rect functions that change the position or size of a rect return a new copy of the rect with the affected changes.
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