Add methods for drawing rotated.

src/OGKBitmap.h

@@ -26,6 +26,11 @@ typedef struct ogk_color_t {
 	float red, green, blue, alpha;
 } ogk_color_t;
 
+typedef struct ogk_rotation_t {
+	of_point_t center;
+	float angle;
+} ogk_rotation_t;
+
 static OF_INLINE ogk_color_t
 ogk_color(float red, float green, float blue, float alpha)
 {
@@ -34,6 +39,14 @@ ogk_color(float red, float green, float blue, float alpha)
 	return color;
 }
 
+static OF_INLINE ogk_rotation_t
+ogk_rotation(float x, float y, float angle)
+{
+	ogk_rotation_t rotation = { of_point(x, y), angle };
+
+	return rotation;
+}
+
 extern ogk_color_t OGK_COLOR_BLACK;
 
 @interface OGKBitmap: OFObject
@@ -68,5 +81,17 @@ extern ogk_color_t OGK_COLOR_BLACK;
 		region: (of_rectangle_t)region
 		 scale: (of_dimension_t)scale
 		  tint: (ogk_color_t)tint;
+- (void)drawAtPosition: (of_point_t)position
+	      rotation: (ogk_rotation_t)rotation;
+- (void)drawAtPosition: (of_point_t)position
+		 scale: (of_dimension_t)scale
+	      rotation: (ogk_rotation_t)rotation;
+- (void)drawAtPosition: (of_point_t)position
+	      rotation: (ogk_rotation_t)rotation
+		  tint: (ogk_color_t)tint;
+- (void)drawAtPosition: (of_point_t)position
+		 scale: (of_dimension_t)scale
+	      rotation: (ogk_rotation_t)rotation
+		  tint: (ogk_color_t)tint;
 - (ALLEGRO_BITMAP*)OGK_allegroBitmap;
 @end

src/OGKBitmap.m

@@ -191,6 +191,41 @@ ogk_color_to_allegro(ogk_color_t color)
 	    scale.height * al_get_bitmap_height(bitmap), 0);
 }
 
+- (void)drawAtPosition: (of_point_t)position
+	      rotation: (ogk_rotation_t)rotation
+{
+	al_draw_rotated_bitmap(bitmap, rotation.center.x, rotation.center.y,
+	    position.x, position.y, rotation.angle, 0);
+}
+
+- (void)drawAtPosition: (of_point_t)position
+		 scale: (of_dimension_t)scale
+	      rotation: (ogk_rotation_t)rotation
+{
+	al_draw_scaled_rotated_bitmap(bitmap, rotation.center.x,
+	    rotation.center.y, position.x, position.y, scale.width,
+	    scale.height, rotation.angle, 0);
+}
+
+- (void)drawAtPosition: (of_point_t)position
+	      rotation: (ogk_rotation_t)rotation
+		  tint: (ogk_color_t)tint
+{
+	al_draw_tinted_rotated_bitmap(bitmap, ogk_color_to_allegro(tint),
+	    rotation.center.x, rotation.center.y, position.x, position.y,
+	    rotation.angle, 0);
+}
+
+- (void)drawAtPosition: (of_point_t)position
+		 scale: (of_dimension_t)scale
+	      rotation: (ogk_rotation_t)rotation
+		  tint: (ogk_color_t)tint
+{
+	al_draw_tinted_scaled_rotated_bitmap(bitmap, ogk_color_to_allegro(tint),
+	    rotation.center.x, rotation.center.y, position.x, position.y,
+	    scale.width, scale.height, rotation.angle, 0);
+}
+
 - (ALLEGRO_BITMAP*)OGK_allegroBitmap
 {
 	return bitmap;

tests/TestMain.h

@@ -32,6 +32,7 @@
 	of_point_t position;
 	of_dimension_t scale;
 	BOOL running;
+	ogk_rotation_t rotation;
 	ogk_color_t tint;
 }
 @end

tests/TestMain.m

@@ -51,6 +51,12 @@ OF_APPLICATION_DELEGATE(TestMain)
 	case OGK_KEY_N:
 		tint = ogk_color(1, 1, 1, 0);
 		break;
+	case OGK_KEY_LEFT:
+		rotation.angle -= M_PI / 128;
+		break;
+	case OGK_KEY_RIGHT:
+		rotation.angle += M_PI / 128;
+		break;
 	case OGK_KEY_Q:
 		running = NO;
 		break;
@@ -104,6 +110,7 @@ OF_APPLICATION_DELEGATE(TestMain)
 	[OGKBitmap clearToColor: OGK_COLOR_BLACK];
 	[bitmap drawAtPosition: position
 			 scale: scale
+		      rotation: rotation
 			  tint: tint];
 	[display update];
 }
@@ -135,6 +142,8 @@ OF_APPLICATION_DELEGATE(TestMain)
 	bitmap = [[OGKBitmap alloc] initWithFile: @"test.bmp"];
 	position = of_point(display.size.width / 2, display.size.height / 2);
 	scale = of_dimension(1, 1);
+	rotation = ogk_rotation(bitmap.size.width / 2, bitmap.size.height / 2,
+	    0);
 	tint = ogk_color(1, 1, 1, 0);
 
 	for (running = YES; running;) {