Added function to draw a straight line

drawutils.cpp

@@ -49,3 +49,40 @@ bool DrawUtils::draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y,
 
     return true;
 }
+
+void DrawUtils::draw_line(Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint16 width, Uint32 colour, SDL_Surface* dest)
+{
+    float dx, dy, len;
+    float cx, cy; // our current coords
+
+    SDL_Rect pen;
+
+    dx = static_cast<float>(x2-x1);
+    dy = static_cast<float>(y2-y1);
+
+    len = sqrt(dx*dx + dy*dy);
+
+    // changing dx and dy's meanings. Now they represent the amount we move
+    // each step in our drawing loop
+    dx /= len;
+    dy /= len;
+
+    int j = static_cast<int>(len);
+
+    cx = static_cast<float>(x1 - (width>>1));
+    cy = static_cast<float>(y1 - (width>>1));
+
+    int i;
+    for(i = 0; i < j; i++)
+    {
+	pen.x = (Sint16)cx;
+	pen.y = (Sint16)cy;
+	pen.w = width;
+	pen.h = width;
+
+	SDL_FillRect(dest, &pen, colour);
+
+	cx += dx;
+	cy += dy;
+    }
+}

drawutils.h

@@ -16,6 +16,7 @@ class DrawUtils
     static bool draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y);
     static bool draw(SDL_Surface* dest, SDL_Surface* drawable, int x, int y, 
 		     int x2, int y2, int w, int h);
+    static void draw_line(Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint16 width, Uint32 colour, SDL_Surface* dest);
 };
 
 #endif