Fix interesting, but incorrect visual effect

src/mode/graphics.rs

@@ -113,11 +113,11 @@ where
     pub fn clear(&mut self) {
         self.buffer = GenericArray::default();
 
-        let (width, height) = self.get_dimensions();
+        // Let flush() clip these
         self.min_x = 0;
-        self.max_x = width - 1;
+        self.max_x = 255;
         self.min_y = 0;
-        self.max_y = height - 1;
+        self.max_y = 255;
     }
 
     /// Write out data to a display.
@@ -162,7 +162,7 @@ where
         // umm... cast up and down, must cleanup
         let (x, y) = DROTATION::transform(x as u8, y as u8);
 
-        let idx = ((x as usize) / 8 * DSIZE::WIDTH as usize) + (y as usize);
+        let idx = ((y as usize) / 8 * DSIZE::WIDTH as usize) + (x as usize);
         let bit = y % 8;
 
         if let Some(byte) = self.buffer.get_mut(idx) {