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Diffstat (limited to 'src/mechanics/mechanicsitem.h')
| -rw-r--r-- | src/mechanics/mechanicsitem.h | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/mechanics/mechanicsitem.h b/src/mechanics/mechanicsitem.h new file mode 100644 index 0000000..db500fc --- /dev/null +++ b/src/mechanics/mechanicsitem.h @@ -0,0 +1,237 @@ +/*************************************************************************** + * 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 |