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git://projects.qi-hardware.com/antorcha.git
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131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
/*
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* tools/plot.c - Sample plot
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include "SDL.h"
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#include "SDL_gfxPrimitives.h"
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#include "plot.h"
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#define XRES 1024
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#define YRES 1024
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#define RADIUS 3
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#define OLD_RGBA 0xffffff20
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#define NEW_RGBA 0xffffffff
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static SDL_Surface *surf;
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static int first = 1;
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static int last_x, last_y;
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static SDL_Surface *back;
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static SDL_Rect back_rect = {
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.x = 0,
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.y = 0,
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.w = 2*RADIUS+1,
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.h = 2*RADIUS+1,
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};
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static SDL_Rect front_rect = {
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.w = 2*RADIUS+1,
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.h = 2*RADIUS+1,
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};
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int plot(int x, int y)
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{
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SDL_Event event;
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if (!first) {
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SDL_BlitSurface(back, &back_rect, surf, &front_rect);
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SDL_LockSurface(surf);
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filledCircleColor(surf, last_x, last_y, RADIUS, OLD_RGBA);
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SDL_UnlockSurface(surf);
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}
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front_rect.x = x;
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front_rect.y = y;
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x += RADIUS;
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y += RADIUS;
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SDL_BlitSurface(surf, &front_rect, back, &back_rect);
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SDL_LockSurface(surf);
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filledCircleColor(surf, x, y, RADIUS, NEW_RGBA);
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SDL_UnlockSurface(surf);
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if (!first)
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SDL_UpdateRect(surf,
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last_x-RADIUS, last_y-RADIUS, 2*RADIUS+1, 2*RADIUS+1);
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SDL_UpdateRect(surf, x-RADIUS, y-RADIUS, 2*RADIUS+1, 2*RADIUS+1);
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first = 0;
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last_x = x;
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last_y = y;
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while (SDL_PollEvent(&event))
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switch (event.type) {
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym) {
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case SDLK_c:
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SDL_LockSurface(surf);
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SDL_FillRect(surf, NULL,
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SDL_MapRGB(surf->format, 0, 0, 0));
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SDL_UpdateRect(surf, 0, 0, 0, 0);
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SDL_UnlockSurface(surf);
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break;
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case SDLK_q:
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return 0;
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default:
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break;
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}
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break;
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case SDL_QUIT:
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return 0;
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default:
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break;
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}
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return 1;
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}
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void plot_init(void)
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{
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const SDL_PixelFormat *f;
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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fprintf(stderr, "SDL_init: %s\n", SDL_GetError());
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exit(1);
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}
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atexit(SDL_Quit);
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surf = SDL_SetVideoMode(XRES+2*RADIUS+1, YRES+2*RADIUS+1, 0,
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SDL_SWSURFACE);
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if (!surf) {
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fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
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exit(1);
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}
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f = surf->format;
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back = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*RADIUS+1, 2*RADIUS+1,
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f->BitsPerPixel, f->Rmask, f->Gmask, f->Bmask, f->Amask);
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if (!back) {
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fprintf(stderr, "SDL_SetVideoMode: %s\n", SDL_GetError());
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exit(1);
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}
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}
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