From 1f4430f3d094cc3e028c5daceecb4c36aac8e468 Mon Sep 17 00:00:00 2001
From: BeaR <cinaera@web.de>
Date: Tue, 7 Oct 2014 20:07:46 +0200
Subject: [PATCH] Editor: Add feature to zoom to mouse position

---
 src/game/editor/editor.cpp | 36 +++++++++++++++++++++++++++++++++---
 src/game/editor/editor.h   |  1 +
 src/game/variables.h       |  1 +
 3 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/src/game/editor/editor.cpp b/src/game/editor/editor.cpp
index 771f5bf85..63bb6e029 100644
--- a/src/game/editor/editor.cpp
+++ b/src/game/editor/editor.cpp
@@ -4028,12 +4028,22 @@ void CEditor::Render()
 	}
 	if(m_Dialog == DIALOG_NONE && UI()->MouseInside(&View))
 	{
+		// Determines in which direction to zoom.
+		int Zoom = 0;
 		if(Input()->KeyPresses(KEY_MOUSE_WHEEL_UP))
-			m_ZoomLevel -= 20;
-
+			Zoom--;
 		if(Input()->KeyPresses(KEY_MOUSE_WHEEL_DOWN))
-			m_ZoomLevel += 20;
+			Zoom++;
+
+		if(Zoom != 0)
+		{
+			float OldLevel = m_ZoomLevel;
+			m_ZoomLevel = clamp(m_ZoomLevel + Zoom * 20, 50, 2000);
+			if(g_Config.m_EdZoomTarget)
+				ZoomMouseTarget((float)m_ZoomLevel / OldLevel);
+		}
 	}
+
 	m_ZoomLevel = clamp(m_ZoomLevel, 50, 2000);
 	m_WorldZoom = m_ZoomLevel/100.0f;
 	float Brightness = 0.25f;
@@ -4229,6 +4239,26 @@ int CEditor::GetLineDistance()
 	return LineDistance;
 }
 
+void CEditor::ZoomMouseTarget(float ZoomFactor)
+{
+	// zoom to the current mouse position
+	// get absolute mouse position
+	float aPoints[4];
+	RenderTools()->MapscreenToWorld(
+		m_WorldOffsetX, m_WorldOffsetY,
+		1.0f, 1.0f, 0.0f, 0.0f, Graphics()->ScreenAspect(), m_WorldZoom, aPoints);
+
+	float WorldWidth = aPoints[2]-aPoints[0];
+	float WorldHeight = aPoints[3]-aPoints[1];
+
+	float Mwx = aPoints[0] + WorldWidth * (UI()->MouseX()/UI()->Screen()->w);
+	float Mwy = aPoints[1] + WorldHeight * (UI()->MouseY()/UI()->Screen()->h);
+
+	// adjust camera
+	m_WorldOffsetX += (Mwx-m_WorldOffsetX) * (1-ZoomFactor);
+	m_WorldOffsetY += (Mwy-m_WorldOffsetY) * (1-ZoomFactor);
+}
+
 void CEditorMap::DeleteEnvelope(int Index)
 {
 	if(Index < 0 || Index >= m_lEnvelopes.size())
diff --git a/src/game/editor/editor.h b/src/game/editor/editor.h
index d216211b9..3e9e167dd 100644
--- a/src/game/editor/editor.h
+++ b/src/game/editor/editor.h
@@ -913,6 +913,7 @@ public:
 	}
 
 	int GetLineDistance();
+	void ZoomMouseTarget(float ZoomFactor);
 
 	// DDRace
 
diff --git a/src/game/variables.h b/src/game/variables.h
index 84fe4612d..4637c2930 100644
--- a/src/game/variables.h
+++ b/src/game/variables.h
@@ -48,6 +48,7 @@ MACRO_CONFIG_INT(ClMouseMaxDistance, cl_mouse_max_distance, 400, 0, 0, CFGFLAG_C
 MACRO_CONFIG_INT(ClMouseMaxDistance, cl_mouse_max_distance, 800, 0, 0, CFGFLAG_CLIENT|CFGFLAG_SAVE, "")
 #endif
 
+MACRO_CONFIG_INT(EdZoomTarget, ed_zoom_target, 0, 0, 1, CFGFLAG_CLIENT|CFGFLAG_SAVE, "Zoom to the current mouse target")
 MACRO_CONFIG_INT(EdShowkeys, ed_showkeys, 0, 0, 1, CFGFLAG_CLIENT|CFGFLAG_SAVE, "")
 
 //MACRO_CONFIG_INT(ClFlow, cl_flow, 0, 0, 1, CFGFLAG_CLIENT|CFGFLAG_SAVE, "")