From 69b46aeb27ecfbf87fec5945993a9a441cb89fc7 Mon Sep 17 00:00:00 2001
From: Mattes D <github@xoft.cz>
Date: Sun, 14 Sep 2014 22:05:10 +0200
Subject: QtBiomeVisualiser: Added mouse and keyboard view control.

Mouse dragging or WASD pans view, mouse wheel or QE zooms.
---
 Tools/QtBiomeVisualiser/BiomeView.cpp | 113 +++++++++++++++++++++++++++++++++-
 Tools/QtBiomeVisualiser/BiomeView.h   |  28 ++++++++-
 2 files changed, 137 insertions(+), 4 deletions(-)

diff --git a/Tools/QtBiomeVisualiser/BiomeView.cpp b/Tools/QtBiomeVisualiser/BiomeView.cpp
index be01fd104..3d24ed126 100644
--- a/Tools/QtBiomeVisualiser/BiomeView.cpp
+++ b/Tools/QtBiomeVisualiser/BiomeView.cpp
@@ -33,6 +33,9 @@ BiomeView::BiomeView(QWidget * parent) :
 
 	// Add a chunk-update callback mechanism:
 	connect(&m_Cache, SIGNAL(chunkAvailable(int, int)), this, SLOT(chunkAvailable(int, int)));
+
+	// Allow keyboard interaction:
+	setFocusPolicy(Qt::StrongFocus);
 }
 
 
@@ -236,9 +239,117 @@ void BiomeView::paintEvent(QPaintEvent * a_Event)
 
 
 
-void BiomeView::queueChunkRender(ChunkPtr a_Chunk)
+void BiomeView::mousePressEvent(QMouseEvent * a_Event)
+{
+	m_LastX = a_Event->x();
+	m_LastY = a_Event->y();
+	m_IsMouseDragging = true;
+}
+
+
+
+
+
+void BiomeView::mouseMoveEvent(QMouseEvent * a_Event)
+{
+	if (m_IsMouseDragging)
+	{
+		// The user is dragging the mouse, move the view around:
+		m_X += (m_LastX - a_Event->x()) / m_Zoom;
+		m_Z += (m_LastY - a_Event->y()) / m_Zoom;
+		m_LastX = a_Event->x();
+		m_LastY = a_Event->y();
+		redraw();
+		return;
+	}
+
+	// TODO: Update the status bar info for the biome currently pointed at
+}
+
+
+
+
+
+void BiomeView::mouseReleaseEvent(QMouseEvent *)
+{
+	m_IsMouseDragging = false;
+}
+
+
+
+
+
+void BiomeView::wheelEvent(QWheelEvent * a_Event)
+{
+	m_Zoom += floor(a_Event->delta() / 90.0);
+	m_Zoom = Clamp(m_Zoom, 1.0, 20.0);
+	redraw();
+}
+
+
+
+
+
+void BiomeView::keyPressEvent(QKeyEvent * a_Event)
 {
+	switch (a_Event->key())
+	{
+		case Qt::Key_Up:
+		case Qt::Key_W:
+		{
+			m_Z -= 10.0 / m_Zoom;
+			redraw();
+			break;
+		}
+
+		case Qt::Key_Down:
+		case Qt::Key_S:
+		{
+			m_Z += 10.0 / m_Zoom;
+			redraw();
+			break;
+		}
+
+		case Qt::Key_Left:
+		case Qt::Key_A:
+		{
+			m_X -= 10.0 / m_Zoom;
+			redraw();
+			break;
+		}
+
+		case Qt::Key_Right:
+		case Qt::Key_D:
+		{
+			m_X += 10.0 / m_Zoom;
+			redraw();
+			break;
+		}
+
+		case Qt::Key_PageUp:
+		case Qt::Key_Q:
+		{
+			m_Zoom++;
+			if (m_Zoom > 20.0)
+			{
+				m_Zoom = 20.0;
+			}
+			redraw();
+			break;
+		}
 
+		case Qt::Key_PageDown:
+		case Qt::Key_E:
+		{
+			m_Zoom--;
+			if (m_Zoom < 1.0)
+			{
+				m_Zoom = 1.0;
+			}
+			redraw();
+			break;
+		}
+	}
 }
 
 
diff --git a/Tools/QtBiomeVisualiser/BiomeView.h b/Tools/QtBiomeVisualiser/BiomeView.h
index c54c66491..8aae43df0 100644
--- a/Tools/QtBiomeVisualiser/BiomeView.h
+++ b/Tools/QtBiomeVisualiser/BiomeView.h
@@ -35,10 +35,20 @@ public slots:
 
 protected:
 	double m_X, m_Z;
-	int m_Zoom;
+	double m_Zoom;
+
+	/** Cache for the loaded chunk data. */
 	ChunkCache m_Cache;
+
+	/** The entire view's contents in an offscreen image. */
 	QImage m_Image;
 
+	/** Coords of the mouse for the previous position, used while dragging. */
+	int m_LastX, m_LastY;
+
+	/** Set to true when the user has a mouse button depressed, and is dragging the view. */
+	bool m_IsMouseDragging;
+
 	/** Data used for rendering a chunk that hasn't been loaded yet */
 	uchar m_EmptyChunkImage[16 * 16 * 4];
 
@@ -55,8 +65,20 @@ protected:
 	/** Paints the entire widget */
 	virtual void paintEvent(QPaintEvent *) override;
 
-	/** Queues the chunk for rendering. */
-	void queueChunkRender(ChunkPtr a_Chunk);
+	/** Called when the user presses any mouse button. */
+	virtual void mousePressEvent(QMouseEvent * a_Event);
+
+	/** Called when the user moves the mouse. */
+	virtual void mouseMoveEvent(QMouseEvent * a_Event);
+
+	/** Called when the user releases a previously held mouse button. */
+	virtual void mouseReleaseEvent(QMouseEvent * a_Event) override;
+
+	/** Called when the user rotates the mouse wheel. */
+	virtual void wheelEvent(QWheelEvent * a_Event) override;
+
+	/** Called when the user presses a key. */
+	virtual void keyPressEvent(QKeyEvent * a_Event) override;
 };
 
 
-- 
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