Add text alignment

src/font.rs

@@ -64,7 +64,19 @@ impl<'a> FontRenderer<'a> {
         v_align: VerticalAlignment,
     ) {
         let data = self.prepare(text.into());
-        self.raw_render(display, data, position);
+
+        let x = match h_align {
+            HorizontalAlignment::RightToLeft => position.x - data.pixel_width as i16,
+            HorizontalAlignment::Center => position.x - (data.pixel_width as i16 / 2),
+            HorizontalAlignment::LeftToRight => position.x,
+        };
+        let y = match v_align {
+            VerticalAlignment::BottomToTop => position.y - self.height as i16,
+            VerticalAlignment::Center => position.y - (self.height as i16 / 2),
+            VerticalAlignment::TopToBottom => position.y,
+        };
+
+        self.raw_render(display, data, Position { x, y });
     }
 
     pub fn prepare(&self, text: String) -> RawRenderData<'a> {

src/main.rs

@@ -114,9 +114,9 @@ fn main() -> ! {
     font_renderer.render(
         &mut display,
         "Hello World!",
-        Position::new(0, 0),
-        HorizontalAlignment::LeftToRight,
-        VerticalAlignment::TopToBottom,
+        Position::new(120, 120),
+        HorizontalAlignment::Center,
+        VerticalAlignment::Center,
     );
 
     let sim_rst = Output::new(peripherals.GPIO15, Level::High, OutputConfig::default());