Added KDE3 version of ktechlab

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/ktechlab@1095338 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 237 insertions, 0 deletions

diff --git a/src/mechanics/mechanicsitem.h b/src/mechanics/mechanicsitem.h
new file mode 100644
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+++ b/src/mechanics/mechanicsitem.h
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+/***************************************************************************
+ *   Copyright (C) 2004-2005 by David Saxton                               *
+ *   david@bluehaze.org                                                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef MECHANICSITEM_H
+#define MECHANICSITEM_H
+
+#include <item.h>
+#include <qvaluelist.h>
+
+class LibraryItem;
+class MechanicsItem;
+// class MechanicsItemOverlayItem;
+class MechanicsDocument;
+typedef QValueList<MechanicsItem*> MechanicsItemList;
+
+/**
+@short Stores mass, moment of inertia
+@author David Saxton
+*/
+class MechanicsInfo
+{
+public:
+	MechanicsInfo();
+	
+	double mass; // Mass
+	double momentOfInertia; // Moment of inertia
+};
+
+class CombinedMechanicsInfo : public MechanicsInfo
+{
+public:
+	CombinedMechanicsInfo();
+	CombinedMechanicsInfo( const MechanicsInfo &info );
+	
+	double x; // X coordinate of center of mass
+	double y; // Y coordinate of center of mass
+};
+
+/**
+@short Stores a position and orientation
+@author David Saxton
+*/
+class PositionInfo
+{
+public:
+	PositionInfo();
+	/**
+	 * Adds together two positions: for this=PARENT +(CHILD), the new position
+	 * is formed by translating this position by that of the CHILDs
+	 * translation, and then rotating everything about the center of this item
+	 */
+	const PositionInfo operator+( const PositionInfo &info );
+	/**
+	 * Not quite the inverse of operator+. Subtracts the given position info
+	 * as if it was applied before this current info.
+	 */
+	const PositionInfo operator-( const PositionInfo &info );
+	/**
+	 * x position (0 is left)
+	 */
+	double x() const { return m_x; }
+	/**
+	 * y position (0 is top)
+	 */
+	double y() const { return m_y; }
+	/**
+	 * Angle in radians, positive direction is anticlockwise
+	 */
+	double angle() const { return m_angle; }
+	/**
+	 * Sets the x-position
+	 */
+	void setX( double x ) { m_x = x; }
+	/**
+	 * Sets the y-position
+	 */
+	void setY( double y ) { m_y = y; }
+	/**
+	 * Sets the angle
+	 */
+	void setAngle( double angle ) { m_angle = angle; }
+	/**
+	 * Adds (x,y) to the current position
+	 */
+	void translate( double dx, const double dy ) { m_x += dx; m_y += dy; }
+	/**
+	 * Rotates anticlockwise by the given amount (in radians)
+	 */
+	void rotate( double angle ) { m_angle += angle; }
+	/**
+	 * Resets the position to (0,0), and the orientation to 0
+	 */
+	void reset();
+	/**
+	 * Rotates the current position about the given point through the given
+	 * angle in radians anticlockwise. This will change the position and
+	 * orientation.
+	 */
+	void rotateAboutPoint( double x, double y, double angle );
+	
+protected:
+	double m_x;
+	double m_y;
+	double m_angle;
+};
+
+
+/**
+@author David Saxton
+*/
+class MechanicsItem : public Item
+{
+Q_OBJECT
+public:
+	MechanicsItem( MechanicsDocument *mechanicsDocument, bool newItem, const QString &id );
+	virtual ~MechanicsItem();
+	
+	enum SelectionMode
+	{
+		sm_move,
+		sm_resize,
+		sm_rotate
+	};
+	/**
+	 * Returns the run-time identifier for the MechanicsItem
+	 */
+	int rtti() const;
+	/**
+	 * Sets the selection mode (sm_resize or sm_rotate). Note that setSelected
+	 * also needs to be called to select the item.
+	 */
+	void setSelectionMode( SelectionMode sm );
+	virtual void setSelected( bool yes );
+	/**
+	 * @returns the selection mode
+	 */
+	SelectionMode selectionMode() const { return m_selectionMode; }
+	/**
+	 * Move the MechanicsItem by the given amount
+	 */
+	virtual void moveBy( double dx, double dy );
+	/**
+	 * Returns the absolute position on the canvas
+	 */
+	PositionInfo absolutePosition() const;
+	/**
+	 * Returns the position relative to the parent item (or the absolute
+	 * position if there is no parent item)
+	 */
+	PositionInfo relativePosition() const { return m_relativePosition; }
+	/**
+	 * Returns the mechanics info for this item (so not taking into account that
+	 * of attached children)
+	 */
+	MechanicsInfo *mechanicsInfo() { return &m_mechanicsInfo; }
+	/**
+	 * Returns the combined mechanics info for this item (which takes into
+	 * account that of attached children).
+	 */
+	CombinedMechanicsInfo *mechanicsInfoCombined() { return &m_mechanicsInfoCombined; }
+	/**
+	 * Returns the rectangle that can legitimately fit inside the given bounding
+	 * rectangle, given this items current rotation. Legitimately means that
+	 * whether this item is allowed to be distorted, inverted, resized, etc.
+	 */
+	QRect maxInnerRectangle( const QRect &outerRect ) const;
+	
+	virtual ItemData itemData() const;
+	
+	virtual bool mousePressEvent( const EventInfo &eventInfo );
+	virtual bool mouseReleaseEvent( const EventInfo &eventInfo );
+	virtual bool mouseDoubleClickEvent ( const EventInfo &eventInfo );
+	virtual bool mouseMoveEvent( const EventInfo &eventInfo );
+	virtual bool wheelEvent( const EventInfo &eventInfo );
+	virtual void enterEvent();
+	virtual void leaveEvent();
+	
+public slots:
+	/**
+	 * Rotate the item by the given amount (in radians)
+	 */
+	void rotateBy( double dtheta );
+	void parentMoved();
+	 
+signals:
+	/**
+	 * Emitted when this item moves (translates or rotates)
+	 */
+	void moved();
+	
+protected slots:
+	/**
+	 * Recalculate the combined mechanics info (e.g. when mass is changed, or child added)
+	 */
+	void updateMechanicsInfoCombined();
+	
+protected:
+	virtual void reparented( Item *oldItem, Item *newItem );
+	virtual void childAdded( Item *child );
+	virtual void childRemoved( Item *child );
+	/**
+	 * Called when this item is resized, so that sub classes can do whatever
+	 */
+	virtual void itemResized() {};
+	/**
+	 * Sets the correct orientation on the painter
+	 */
+	void initPainter( QPainter &p );
+	/**
+	 * *Must* be called after calling initPainter, if initPainter was called
+	 */
+	void deinitPainter( QPainter &p );
+	virtual void dataChanged();
+	virtual void itemPointsChanged() { updateCanvasPoints(); }
+	/**
+	 * Calculates the setPoints required from the current m_itemPoints and the
+	 * current position / angle
+	 */
+	void updateCanvasPoints();
+	
+	MechanicsDocument *p_mechanicsDocument;
+	PositionInfo m_relativePosition; // Absolution position if not attached to a parent item, or otherwise relative to parent item
+	MechanicsInfo m_mechanicsInfo;
+	CombinedMechanicsInfo m_mechanicsInfoCombined;
+	
+private:
+	SelectionMode m_selectionMode;
+};
+
+#endif