We now have a scene we can twirl around and we can see the rays being cast in the left side.

fenscaster.cpp

@@ -59,16 +59,16 @@ void draw_rect(Fenster &window, Point pos, Point size, uint32_t color) {
   }
 }
 
-void draw_map_rect(Fenster &window, int x, int y, uint8_t color) {
+void draw_map_rect(Fenster &window, int x, int y, uint32_t color) {
   draw_rect(window,
       {size_t(x * TILE_SIZE), size_t(y * TILE_SIZE)},
       {size_t(TILE_SIZE-1), size_t(TILE_SIZE-1)},
-      gray_color(color));
+      color);
 }
 
 void draw_map(Fenster &window, Matrix &map) {
-  uint8_t light_grey = 191;
-  uint8_t dark_grey = 65;
+  uint32_t light_grey = gray_color(191);
+  uint32_t dark_grey = gray_color(65);
 
   for(size_t y = 0; y < matrix::height(map); y++) {
     for(size_t x = 0; x < matrix::width(map); x++) {
@@ -78,7 +78,31 @@ void draw_map(Fenster &window, Matrix &map) {
 }
 
 void draw_line(Fenster &window, Point start, Point end) {
+  int x = int(start.x);
+  int y = int(start.y);
+  int x1 = int(end.x);
+  int y1 = int(end.y);
+  int dx = std::abs(x1 - x);
+  int sx = x < x1 ? 1 : -1;
+  int dy = std::abs(y1 - y) * -1;
+  int sy = y < y1 ? 1 : -1;
+  int error = dx + dy;
+
+  while(x != x1 || y != y1) {
+    int e2 = 2 * error;
+
+    if(e2 >= dy) {
+      error = error + dy;
+      x = x + sx;
+    }
 
+    if(e2 <= dx) {
+      error = error + dx;
+      y = y + sy;
+    }
+
+    window.px(x, y) = rgba_color(200, 20, 20, 255);
+  }
 }
 
 void clear(Fenster &window) {
@@ -90,7 +114,7 @@ void clear(Fenster &window) {
 }
 
 void draw_map_rays(Fenster &window, int col, int row, Point target) {
-  draw_map_rect(window, col, row, 100);
+  draw_map_rect(window, col, row, rgba_color(100, 20, 20, 255));
   draw_line(window, {size_t(player_x), size_t(player_y)}, target);
 }