89 lines
1.7 KiB
C++
89 lines
1.7 KiB
C++
#include "drawutils.h"
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SDL_Surface* DrawUtils::load(string file)
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{
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SDL_Surface* raw = NULL;
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SDL_Surface* cooked = NULL;
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raw = SDL_LoadBMP(file.c_str());
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if (raw == NULL) return NULL;
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cooked = SDL_DisplayFormat(raw);
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SDL_FreeSurface(raw); // don't consume raw surfaces
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return cooked;
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}
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bool DrawUtils::draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y)
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{
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if (dest == NULL || drawable == NULL) return false;
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SDL_Rect dest_r;
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dest_r.x = x;
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dest_r.y = y;
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SDL_BlitSurface(drawable, NULL, dest, &dest_r);
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return true;
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}
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bool DrawUtils::draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y,
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int x2, int y2, int w, int h)
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{
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SDL_Rect dest_r;
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dest_r.x = x;
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dest_r.y = y;
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SDL_Rect src_r;
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src_r.x = x2;
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src_r.y = y2;
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src_r.w = w;
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src_r.h = h;
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SDL_BlitSurface(drawable, &src_r, dest, &dest_r);
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return true;
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}
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void DrawUtils::draw_line(Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint16 width, Uint32 colour, SDL_Surface* dest)
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{
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float dx, dy, len;
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float cx, cy; // our current coords
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SDL_Rect pen;
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dx = static_cast<float>(x2-x1);
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dy = static_cast<float>(y2-y1);
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len = sqrt(dx*dx + dy*dy);
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// changing dx and dy's meanings. Now they represent the amount we move
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// each step in our drawing loop
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dx /= len;
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dy /= len;
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int j = static_cast<int>(len);
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cx = static_cast<float>(x1 - (width>>1));
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cy = static_cast<float>(y1 - (width>>1));
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int i;
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for(i = 0; i < j; i++)
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{
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pen.x = (Sint16)cx;
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pen.y = (Sint16)cy;
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pen.w = width;
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pen.h = width;
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SDL_FillRect(dest, &pen, colour);
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cx += dx;
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cy += dy;
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}
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}
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