SDL v1.2 >> C/C++

Line

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參考資訊：
1. sdl
2. gfx

函數

int lineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
int lineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

int aalineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
int aalineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

int hlineColor(SDL_Surface * dst, Sint16 x1, Sint16 x2, Sint16 y, Uint32 color);
int hlineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 x2, Sint16 y, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

int vlineColor(SDL_Surface * dst, Sint16 x, Sint16 y1, Sint16 y2, Uint32 color);
int vlineRGBA(SDL_Surface * dst, Sint16 x, Sint16 y1, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL_gfxPrimitives.h>
  
int main(int argc, char **argv)
{
    SDL_Surface *screen = NULL;

    SDL_Init(SDL_INIT_VIDEO);
    screen = SDL_SetVideoMode(320, 240, 16, SDL_HWSURFACE);
    lineRGBA(screen, 10, 10, 50, 50, 0xff, 0xff, 0x00, 0xff);
    aalineRGBA(screen, 20, 70, 200, 70, 0x00, 0xff, 0xff, 0xff);
    hlineRGBA(screen, 100, 200, 100, 0x00, 0xff, 0x00, 0xff);
    vlineRGBA(screen, 100, 200, 100, 0xff, 0x00, 0x00, 0xff);
    SDL_Flip(screen);
    SDL_Delay(3000);

    SDL_Quit();
    return 0;
}

編譯、執行

$ gcc main.c -o main -lSDL -lSDL_gfx -I/usr/include/SDL
$ ./main

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