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A simple test to determine how the rotation center is interpreted

sdl-rotate-center-test.cpp (text/x-c++src), 2.59 KB, created by xyzdragon on 2016-11-15 21:26:29 UTC

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Description:

Filename:

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Creator: xyzdragon

Created: 2016-11-15 21:26:29 UTC

Size: 2.59 KB

patch

obsolete

>/*
>g++ -g -std=c++11 -Wall -Wextra -Wshadow sdl-rotate-center-test.cpp $(sdl2-config --cflags --libs) -l SDL2_ttf && ./a.out
>*/
>
>#include <SDL.h>
>#include <SDL_ttf.h>
>#include <iostream>
>
>
>void testRotation( SDL_Renderer * pRenderer, int x, int y, int w, int h )
>{
>    auto const sEvenLine = SDL_CreateRGBSurfaceWithFormat( 0 /* unused flags */, w,h, 32 /* depth */, SDL_PIXELFORMAT_ARGB32 );
>    auto const sOnePx    = SDL_CreateRGBSurfaceWithFormat( 0 /* unused flags */, h,h, 32 /* depth */, SDL_PIXELFORMAT_ARGB32 );
>    SDL_FillRect( sEvenLine, NULL, 0x908000FF );
>    SDL_FillRect( sOnePx   , NULL, 0xFFFFFFFF );
>    SDL_Texture * tEvenLine = SDL_CreateTextureFromSurface( pRenderer, sEvenLine );
>    SDL_Texture * tOnePx    = SDL_CreateTextureFromSurface( pRenderer, sOnePx    );
>
>    SDL_Rect dstRectEven{ x,y, sEvenLine->w, sEvenLine->h };
>    SDL_RenderCopy( pRenderer, tEvenLine, NULL, &dstRectEven );
>    SDL_RenderCopyEx( pRenderer, tEvenLine, NULL, &dstRectEven,  0, NULL, SDL_FLIP_NONE );
>    SDL_RenderCopyEx( pRenderer, tEvenLine, NULL, &dstRectEven, 90, NULL, SDL_FLIP_NONE );
>
>    SDL_Rect dstRect{ 0,0, sOnePx->w, sOnePx->h };
>    SDL_RenderCopy( pRenderer, tOnePx, NULL, &dstRect );
>
>    dstRect.x = dstRectEven.x + dstRectEven.w / 2;
>    dstRect.y = dstRectEven.y + dstRectEven.h / 2;
>    SDL_RenderCopy( pRenderer, tOnePx, NULL, &dstRect );
>
>    SDL_SetTextureColorMod( tOnePx, 255,0,0 );
>    SDL_RenderCopyEx( pRenderer, tOnePx, NULL, &dstRect, 90, NULL, SDL_FLIP_NONE );
>    SDL_SetTextureColorMod( tOnePx, 0,255,0 );
>    SDL_RenderCopyEx( pRenderer, tOnePx, NULL, &dstRect, 180, NULL, SDL_FLIP_NONE );
>    SDL_SetTextureColorMod( tOnePx, 0,0,255 );
>    SDL_RenderCopyEx( pRenderer, tOnePx, NULL, &dstRect, 270, NULL, SDL_FLIP_NONE );
>    SDL_SetTextureColorMod( tOnePx, 0,0,0 );
>    SDL_RenderCopyEx( pRenderer, tOnePx, NULL, &dstRect, 360, NULL, SDL_FLIP_NONE );
>}
>
>
>int main( void )
>{
>    SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER );
>    TTF_Init();
>
>    SDL_Window * pWindow = SDL_CreateWindow( "SDL2_TTF Alpha Test",
>        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 50, 50, SDL_WINDOW_SHOWN );
>    SDL_Renderer * pRenderer = SDL_CreateRenderer( pWindow, -1, SDL_RENDERER_ACCELERATED );
>
>    SDL_SetRenderDrawColor( pRenderer, 30,30,30,255 );
>    SDL_RenderClear( pRenderer );
>
>    testRotation( pRenderer, 10,10, 4,1 );
>    testRotation( pRenderer, 10,20, 4,2 );
>    testRotation( pRenderer, 20,10, 5,1 );
>    testRotation( pRenderer, 20,20, 5,2 );
>
>
>    SDL_RenderPresent( pRenderer );
>    SDL_Delay( 2000 );
>    SDL_DestroyRenderer( pRenderer );
>    SDL_DestroyWindow( pWindow );
>    SDL_Quit();
>
>    return 0;
>}

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Attachments on bug 3493: 2631 | 2632

We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.