transparency

问题 I would like to write a program perferably in Java that can display animated overlays on a screen. The screen will then be broadcast streamed over the internet using a separate program called x-split. A good way to do this would be to create a transparent window in java which will display animated files (with transparancy) and the output of this window (Its display) should ideally appear in the webcam device list so it can be easily picked up by x-split which will allow it to be arranged

问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 I am working on a handwriting application on iOS. I found the sample project "GLPaint" from iOS documentation which is implemented by OpenGL ES, and I did something modification on it. I track the touch points and calculate the curves between the points and draw particle images alone the curve to make it looks like where the finger passby. glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,

问题 I am working on a handwriting application on iOS. I found the sample project "GLPaint" from iOS documentation which is implemented by OpenGL ES, and I did something modification on it. I track the touch points and calculate the curves between the points and draw particle images alone the curve to make it looks like where the finger passby. glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,

问题 I need to create a transparent bitmap using Direct2D and draw, by using my device context, on it. ID2D1DeviceContext1* d2dContext = ... ID2D1Bitmap* pBitmap; d2dContext->CreateBitmap( bitmapSize, nullptr, 0, D2D1::BitmapProperties1( D2D1_BITMAP_OPTIONS_TARGET, D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED), dpiX, dpiY), &pBitmap); d2dContext->BeginDraw(); d2dContext->SetTarget(pBitmap); d2dContext->Clear(D2D1::ColorF(0, 0)); d2dContext->DrawLine(...); hr =

问题 I need to create a transparent bitmap using Direct2D and draw, by using my device context, on it. ID2D1DeviceContext1* d2dContext = ... ID2D1Bitmap* pBitmap; d2dContext->CreateBitmap( bitmapSize, nullptr, 0, D2D1::BitmapProperties1( D2D1_BITMAP_OPTIONS_TARGET, D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED), dpiX, dpiY), &pBitmap); d2dContext->BeginDraw(); d2dContext->SetTarget(pBitmap); d2dContext->Clear(D2D1::ColorF(0, 0)); d2dContext->DrawLine(...); hr =

问题 I am using portable Octave 5.1.0 under Win 10. I mean to write a plot to png with transparent background. Disclaimer: This question is similar to the two linked below. I opted asking the present different question since I am adding further relevant information (by the same token, question #2 below was not a dupe of #1). This is what I found: print(gcf,'-dpngalpha', 'myplot.png'); , suggested in Saving a plot in Octave with transparent background, does not work for me. It is remarkable that I

问题 I need to create a surface that has a bounding circle. Anything drawn on that surface should not be visible outside that bounding circle. I've tried using masks, subsurfaces, srcalpha, etc., but nothing seems to work. My attempt: w = ss.get_width () h = ss.get_height () TRANSPARENT = (255, 255, 255, 0) OPAQUE = ( 0, 0, 0, 225) crop = pygame.Surface ((w, h), pygame.SRCALPHA, ss) crop.fill (TRANSPARENT) c = round (w / 2), round (h / 2) r = 1 pygame.gfxdraw. aacircle (crop, *c, r, OPAQUE) pygame