shifting in mapedit

src/background.rs

@@ -49,4 +49,56 @@ impl Background {
             }
         }
     }
+
+    /// Shifts all tiles to the left, wrapping
+    pub fn shift_left(&mut self) {
+	for y in 0..self.size.y as usize {
+	    let tmp = self.tiles[0][y];
+
+	    for x in 0..self.size.x as usize - 1 {
+		self.tiles[x][y] = self.tiles[x+1][y];
+	    }
+
+	    self.tiles[self.size.x as usize - 1][y] = tmp;
+	}
+    }
+
+    /// Shifts all tiles to the right, wrapping
+    pub fn shift_right(&mut self) {
+	for y in 0..self.size.y as usize {
+	    let tmp = self.tiles[self.size.x as usize - 1][y];
+
+	    for x in (1..self.size.x as usize).rev() {
+		self.tiles[x][y] = self.tiles[x-1][y];
+	    }
+
+	    self.tiles[0][y] = tmp;
+	}
+    }
+    
+    /// Shifts all tiles up, wrapping
+    pub fn shift_up(&mut self) {
+	for x in 0..self.size.x as usize {
+	    let tmp = self.tiles[x][0];
+
+	    for y in 0..self.size.y as usize - 1 {
+		self.tiles[x][y] = self.tiles[x][y+1];
+	    }
+
+	    self.tiles[x][self.size.y as usize - 1] = tmp;
+	}
+    }
+
+    /// Shifts all tiles down, wrapping
+    pub fn shift_down(&mut self) {
+	for x in 0..self.size.x as usize {
+	    let tmp = self.tiles[x][self.size.y as usize - 1];
+
+	    for y in (1..self.size.y as usize).rev() {
+		self.tiles[x][y] = self.tiles[x][y-1];
+	    }
+
+	    self.tiles[x][0] = tmp;
+	}
+    }
 }

src/mapedit/constants.rs

@@ -22,4 +22,8 @@ pub const BUT_LAYER1: usize = 3;
 pub const BUT_LAYER2: usize = 4;
 pub const BUT_LAYER3: usize = 5;
 pub const BUT_LAYERS: usize = 6;
-pub const BUT_EXIT: usize = 8;
+pub const BUT_SHIFT_LEFT: usize = 8;
+pub const BUT_SHIFT_RIGHT: usize = 9;
+pub const BUT_SHIFT_UP: usize = 10;
+pub const BUT_SHIFT_DOWN: usize = 11;
+pub const BUT_EXIT: usize = 13;

src/mapedit/mod.rs

@@ -232,6 +232,26 @@ pub(crate) fn run_mapedit() {
                                     stuff.all_layers = !stuff.all_layers;
                                     stuff.set_state(stuff.state);
                                 }
+				BUT_SHIFT_LEFT => {
+				    stuff.gsa1.bg[0].shift_left();
+				    stuff.gsa1.bg[1].shift_left();
+				    stuff.gsa1.bg[2].shift_left();
+				}
+				BUT_SHIFT_RIGHT => {
+				    stuff.gsa1.bg[0].shift_right();
+				    stuff.gsa1.bg[1].shift_right();
+				    stuff.gsa1.bg[2].shift_right();
+				}
+				BUT_SHIFT_UP => {
+				    stuff.gsa1.bg[0].shift_up();
+				    stuff.gsa1.bg[1].shift_up();
+				    stuff.gsa1.bg[2].shift_up();				    
+				}
+				BUT_SHIFT_DOWN => {
+				    stuff.gsa1.bg[0].shift_down();
+				    stuff.gsa1.bg[1].shift_down();
+				    stuff.gsa1.bg[2].shift_down();				    
+				}
                                 BUT_EXIT => {
                                     println!("exit");
                                     *control_flow = ControlFlow::Exit;

src/mapedit/stuff.rs

@@ -75,6 +75,11 @@ impl Stuff {
         };
         self.gsa2.bg[2].tiles[0][BUT_LAYERS] = if self.all_layers { 0x7114 } else { 0x7014 };
 
+	self.gsa2.bg[2].tiles[0][BUT_SHIFT_LEFT] = 0x7314;
+	self.gsa2.bg[2].tiles[0][BUT_SHIFT_RIGHT] = 0x7315;
+	self.gsa2.bg[2].tiles[0][BUT_SHIFT_UP] = 0x7316;
+	self.gsa2.bg[2].tiles[0][BUT_SHIFT_DOWN] = 0x7317;
+
         self.gsa2.bg[2].size = IVec2 { x: 120, y: 68 }; //enough to cover 4k monitors? <_<
         self.gsa2.bg[3].size = IVec2 { x: 240, y: 136 };