From 005206229d45701a44b12d20f6d7a0662a2b002a Mon Sep 17 00:00:00 2001
From: Nao Pross <naopross@thearcway.org>
Date: Thu, 10 Jan 2019 11:25:12 +0100
Subject: Update pan to use less Graphics members

---
 src/graphics.rs | 33 ++++++++++++---------------------
 1 file changed, 12 insertions(+), 21 deletions(-)

diff --git a/src/graphics.rs b/src/graphics.rs
index d50562d..7e8a0e1 100644
--- a/src/graphics.rs
+++ b/src/graphics.rs
@@ -4,6 +4,7 @@ use sfml::window::mouse::Button;
 
 use sfml::system::{
 	Vector2f,
+	Vector2i
 };
 
 use sfml::window::{
@@ -45,9 +46,6 @@ pub struct Graphics {
 	panning: bool,
 	// pan
 	pan_start: Vector2f,
-	pan_start_center: Vector2f,
-	// absolute zoom
-	zoom: f32,
 	// loaded resources
 	tilesets: HashMap<u32, Image>,
 	textures: HashMap<u32, Texture>,
@@ -93,11 +91,6 @@ impl Graphics {
 			panning: false,
 			// zoom and pan
 			pan_start: Vector2f::new(0.0, 0.0),
-			pan_start_center: Vector2f::new(
-				default_window_size.0 as f32 / 2.0,
-				default_window_size.1 as f32 / 2.0
-			),
-			zoom: 1.0,
 			// resources
 			tilesets: HashMap::new(),
 			textures: HashMap::new(),
@@ -140,6 +133,7 @@ impl Graphics {
 					let tmx_tileset = match state.map.get_tileset_by_gid(tmx_tile) {
 						Some(tileset) => tileset,
 						None => {
+							// TODO: missing_tile texture
 							panic!("Failed to get tileset with get_tileset_by_gid");
 						}
 					};
@@ -194,7 +188,7 @@ impl Graphics {
 						self.tilesets.insert(tmx_tileset.first_gid, image);
 					}
 
-					// draw!
+					// draw tiles
 					// TODO: check map render order
 					let texture = &self.textures.get(&tmx_tile).unwrap();
 					let mut tile_rect = RectangleShape::with_texture(texture);
@@ -209,11 +203,15 @@ impl Graphics {
 						y: (y * tmx_tileset.tile_height) as f32
 					});
 
+
 					self.window.draw(&tile_rect);
 				}
 			}
 		}
 
+		// draw panels
+
+
 		self.window.display();
 	}
 
@@ -225,14 +223,9 @@ impl Graphics {
 					self.running = false;
 				},
 				Event::MouseWheelScrolled { wheel: _, delta, x: _, y: _ } => {
-					// TODO: zoom towards (x, y)
-
 					// delta is probalby a value between -1 and 1
-					let local_zoom = 1.0 + delta * 0.1;
-					// update absolute zoom
-					self.zoom *= local_zoom;
-
-					self.view.zoom(local_zoom);
+					let zoom = 1.0 + delta * 0.1;
+					self.view.zoom(zoom);
 					self.window.set_view(&self.view);
 				},
 				Event::MouseButtonPressed { button, x, y} => {
@@ -241,7 +234,7 @@ impl Graphics {
 						Button::Left => {
 							// set pan start position
 							self.panning = true;
-							self.pan_start = Vector2f::new(x as f32, y as f32);
+							self.pan_start = self.window.map_pixel_to_coords_current_view(&Vector2i::new(x, y));
 						}
 						_ => {},
 					}
@@ -251,7 +244,6 @@ impl Graphics {
 						Button::Right => {}
 						Button::Left => {
 							self.panning = false;
-							self.pan_start_center = self.view.center();
 						},
 						_ => {},
 					}
@@ -259,11 +251,10 @@ impl Graphics {
 				Event::MouseMoved { x, y } => {
 					if self.panning {
 						// get delta of vectors
-						// (pan_start_pos - current_mouse_pos) * zoom
-						let delta = (self.pan_start - Vector2f::new(x as f32, y as f32)) * self.zoom;
+						let delta = self.pan_start - self.window.map_pixel_to_coords_current_view(&Vector2i::new(x, y));
 
 						// move view by moving the center by delta
-						self.view.set_center(self.pan_start_center + delta);
+						self.view.move_(delta);
 						self.window.set_view(&self.view);
 					}
 				}
-- 
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