Tetris: gradient stain on fixed pieces #421

src/tetris/background.h

@@ -12,6 +12,7 @@ void DrawBackground(const std::string& s) {
   if(backg_->render(0, 0, -1, -1) <= 0){
     throw TetrisNotcursesErr("render(): " + s);
   }
+  backg_->get_plane()->greyscale();
 }
 
 // draw the background on the standard plane, then create a new plane for the play area.

src/tetris/movedown.h

@@ -8,13 +8,34 @@ bool MoveDown() {
         return true;
       }
       curpiece_->mergedown(*board_);
+      if(!board_->cursor_move(0, 1)){
+        throw TetrisNotcursesErr("cursor_move()");
+      }
+      int bdimy, bdimx;
+      board_->get_dim(&bdimy, &bdimx);
+      uint64_t tl, tr, bl, br;
+      tl = tr = bl = br = 0;
+      channels_set_bg_alpha(&tl, CELL_ALPHA_TRANSPARENT);
+      channels_set_bg_alpha(&tr, CELL_ALPHA_TRANSPARENT);
+      channels_set_bg_alpha(&bl, CELL_ALPHA_TRANSPARENT);
+      channels_set_bg_alpha(&br, CELL_ALPHA_TRANSPARENT);
+      channels_set_fg(&tl, 0xff0000);
+      channels_set_fg(&tr, 0x00ff00);
+      channels_set_fg(&bl, 0x0000ff);
+      channels_set_fg(&br, 0x00ffff);
+      if(!board_->stain(bdimy - 2, bdimx - 2, tl, tr, bl, br)){
+        throw TetrisNotcursesErr("stain()");
+      }
       curpiece_ = NewPiece();
     }else{
       ++y;
-      if(!curpiece_->move(y, x) || !nc_.render()){
-        throw TetrisNotcursesErr("move() or render()");
+      if(!curpiece_->move(y, x)){
+        throw TetrisNotcursesErr("move()");
       }
     }
+    if(!nc_.render()){
+      throw TetrisNotcursesErr("render()");
+    }
   }
   return false;
 }