From 8aa0a55840f02482884e29b33b770daa6028b81e Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Sun, 19 Feb 2012 12:35:12 +0000
Subject: Commented out debug messages, implemented map dragging.

---
 src/mapentity.cc |  2 +-
 src/mapwidget.cc | 65 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 src/mapwidget.h  | 22 ++++++++++++++++++-
 3 files changed, 78 insertions(+), 11 deletions(-)

diff --git a/src/mapentity.cc b/src/mapentity.cc
index dd16379..55bb501 100644
--- a/src/mapentity.cc
+++ b/src/mapentity.cc
@@ -66,7 +66,7 @@ void MapEntity::paintEvent(QPaintEvent *event)
 void MapEntity::mousePressEvent(QMouseEvent *event)
 {
 	if (event->button() == Qt::LeftButton) {
-		qDebug() << "clicked entity " << name();
+		//qDebug() << "clicked entity " << name();
 		event->accept();
 		
 		emit clicked(this);
diff --git a/src/mapwidget.cc b/src/mapwidget.cc
index a33cf65..779bf91 100644
--- a/src/mapwidget.cc
+++ b/src/mapwidget.cc
@@ -25,21 +25,68 @@ MapWidget::MapWidget(QWidget *parent) : QWidget(parent)
 	mapwidget_zoom = 16;
 	
 	// center of the map (used for dragging)
+	center_x = 0;
+	center_y = 0;
 }
 
 void MapWidget::wheelEvent(QWheelEvent *event)
 {
 	if (event->orientation() == Qt::Vertical) {
+		int oldzoom = mapwidget_zoom;
+		
 		mapwidget_zoom -= event->delta() / 120;
-		if (mapwidget_zoom < 4)
-			mapwidget_zoom = 4;
+		if (mapwidget_zoom < 1)
+			mapwidget_zoom = 1;
 		else if (mapwidget_zoom > 64) {
 			mapwidget_zoom = 64;
 		}
 		
+		center_x = center_x * oldzoom / mapwidget_zoom;
+		center_y = center_y * oldzoom / mapwidget_zoom;
+		
+		resizeChildren();
+		update();
+		event->accept();
+	}
+}
+
+void MapWidget::mousePressEvent(QMouseEvent *event)
+{
+	if (event->button() == Qt::RightButton) {
+		dragstart_x = event->pos().x();
+		dragstart_y = event->pos().y();
+		event->accept();
+		is_dragging = true;
+	} else {
+		is_dragging = false;
+	}
+}
+
+void MapWidget::mouseReleaseEvent(QMouseEvent *event)
+{
+	if (event->button() == Qt::RightButton) {
+		is_dragging = false;
+	}
+}
+
+void MapWidget::mouseMoveEvent(QMouseEvent *event)
+{
+	if (is_dragging) {
+		int delta_x = event->pos().x() - dragstart_x;
+		int delta_y = event->pos().y() - dragstart_y;
+		
+		center_x += delta_x;
+		center_y += delta_y;
+		
+		//qDebug() << "dragging " << delta_x << " " << delta_y;
+		
+		dragstart_x = event->pos().x();
+		dragstart_y = event->pos().y();
+		
+		event->accept();
+		
 		resizeChildren();
 		update();
-		event->accept();		
 	}
 }
 
@@ -56,7 +103,7 @@ void MapWidget::resizeChildren()
 		int x = width() / 2 - (int) (entity->location(1) * scale) - radius;
 		int y = height() / 2 - (int)(entity->location(0) * scale) - radius;
 		
-		entity->setGeometry(x, y, radius * 2 , radius * 2);
+		entity->setGeometry(center_x + x, center_y + y, radius * 2 , radius * 2);
 		//qDebug() << "Moving entity to " << x << " " << y;
 	}
 
@@ -71,7 +118,7 @@ void MapWidget::select(MapEntity *entity)
 		if (entity == mapentity) {
 			
 			entity->set_selected(true);
-			qDebug() << "selected entity " << entity->name();
+			//qDebug() << "selected entity " << entity->name();
 			emit selected(entity);
 			
 		} else {
@@ -99,23 +146,23 @@ void MapWidget::paintEvent(QPaintEvent *event)
 	// gridsize is the size of one grid square in screen coordinates
 	int gridsize = width() / mapwidget_zoom;
 	
-	int x = width() / 2;
+	int x = center_x + width() / 2;
 	while (x > 0) {
 		painter.drawLine(x, 0, x, height());
 		x -= gridsize;
 	}
-	x = width() / 2 + gridsize;
+	x = center_x + width() / 2 + gridsize;
 	while (x <= width()) {
 		painter.drawLine(x, 0, x, height());
 		x += gridsize;
 	}
 	
-	int y = height() / 2;
+	int y = center_y + height() / 2;
 	while (y > 0) {
 		painter.drawLine(0, y, width(), y);
 		y -= gridsize;
 	}
-	y = height() / 2 + gridsize;
+	y = center_y + height() / 2 + gridsize;
 	while (y <= height()) {
 		painter.drawLine(0, y, width(), y);
 		y += gridsize;
diff --git a/src/mapwidget.h b/src/mapwidget.h
index 7371ffd..4f0a1fa 100644
--- a/src/mapwidget.h
+++ b/src/mapwidget.h
@@ -42,7 +42,22 @@ protected:
 	 * @brief handle resize events
 	 * */
 	virtual void resizeEvent(QResizeEvent *event);
-	
+
+	/**
+	 * @brief handle mouse button press events
+	 * */
+	virtual void mousePressEvent(QMouseEvent *event);
+
+	/**
+	 * @brief handle mouse button press events
+	 * */
+	virtual void mouseReleaseEvent(QMouseEvent *event);
+
+	/**
+	 * @brief handle mouse move press events
+	 * */
+	virtual void mouseMoveEvent(QMouseEvent *event);
+
 	/**
 	 * @brief handle mousewheel events
 	 * */	
@@ -64,9 +79,14 @@ private:
 	void resizeChildren();
 	
 	int mapwidget_zoom;
+	int dragstart_x;
+	int dragstart_y;
+	
 	int center_x;
 	int center_y;
 	
+	bool is_dragging;
+
 	QList<MapEntity *>	mapwidget_enties;
 };
 
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