From 833767d6e2fb12436e1fb2ed00caa2f6c7262885 Mon Sep 17 00:00:00 2001
From: martinfouilleul <martinfouilleul@gmail.com>
Date: Thu, 9 Feb 2023 09:50:53 +0100
Subject: [PATCH] move text with the mouse in perf_text example

---
 examples/perf_text/main.c | 35 +++++++++++++++++++++++++++++++++--
 src/win32_app.c           | 11 +++++++----
 todo.txt                  |  1 +
 3 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/examples/perf_text/main.c b/examples/perf_text/main.c
index ab3722d..d2a7df2 100644
--- a/examples/perf_text/main.c
+++ b/examples/perf_text/main.c
@@ -112,6 +112,11 @@ int main()
 
 	f64 frameTime = 0;
 
+	bool tracked = false;
+	vec2 trackPoint = {0};
+	f32 startX = 10;
+	f32 startY = contentRect.h - lineHeight - 10;
+
 	while(!mp_should_quit())
 	{
 		f64 startFrameTime = mp_get_time(MP_CLOCK_MONOTONIC);
@@ -127,13 +132,39 @@ int main()
 					mp_request_quit();
 				} break;
 
+				case MP_EVENT_MOUSE_BUTTON:
+				{
+					if(event.key.code == MP_MOUSE_LEFT)
+					{
+						if(event.key.action == MP_KEY_PRESS)
+						{
+							tracked = true;
+							vec2 mousePos = mp_input_mouse_position();
+							trackPoint.x = mousePos.x - startX;
+							trackPoint.y = mousePos.y - startY;
+						}
+						else
+						{
+							tracked = false;
+						}
+
+					}
+				} break;
+
 				default:
 					break;
 			}
 		}
 
-		f32 textX = 10;
-		f32 textY = contentRect.h - lineHeight - 10;
+		if(tracked)
+		{
+			vec2 mousePos = mp_input_mouse_position();
+			startX = mousePos.x - trackPoint.x;
+			startY = mousePos.y - trackPoint.y;
+		}
+
+		f32 textX = startX;
+		f32 textY = startY;
 
 		mg_surface_prepare(surface);
 			mg_set_color_rgba(1, 1, 1, 1);
diff --git a/src/win32_app.c b/src/win32_app.c
index 1f1e960..27659e3 100644
--- a/src/win32_app.c
+++ b/src/win32_app.c
@@ -224,8 +224,8 @@ static void process_mouse_event(mp_window_data* window, mp_key_action action, mp
 	mp_event event = {0};
 	event.window = mp_window_handle_from_ptr(window);
 	event.type = MP_EVENT_MOUSE_BUTTON;
-	event.key.action = MP_KEY_PRESS;
-	event.key.code = MP_MOUSE_LEFT;
+	event.key.action = action;
+	event.key.code = button;
 	event.key.mods = mp_get_mod_keys();
 
 	mp_queue_event(&event);
@@ -378,11 +378,14 @@ LRESULT WinProc(HWND windowHandle, UINT message, WPARAM wParam, LPARAM lParam)
 			RECT rect;
 			GetClientRect(mpWindow->win32.hWnd, &rect);
 
+			u32 dpi = GetDpiForWindow(mpWindow->win32.hWnd);
+			f32 scaling = (f32)dpi/96.;
+
 			mp_event event = {0};
 			event.window = mp_window_handle_from_ptr(mpWindow);
 			event.type = MP_EVENT_MOUSE_MOVE;
-			event.move.x = LOWORD(lParam);
-			event.move.y = rect.bottom - HIWORD(lParam);
+			event.move.x = LOWORD(lParam) / scaling;
+			event.move.y = (rect.bottom - HIWORD(lParam)) / scaling;
 
 			if(__mpApp.inputState.mouse.posValid)
 			{
diff --git a/todo.txt b/todo.txt
index ffd9320..2268a22 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,6 +1,7 @@
 
 Overview
 --------
+[ ] Pan/Zoom on text example
 [ ] Clean+Fixes of canvas code and examples
 [ ] Make backend selection easier
 [ ] Investigate and fix artifact when seam is aligned to tile boundary?