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rs_entity.h

/****************************************************************************
** $Id: rs_entity.h,v 1.28 2004/09/04 19:56:41 andrew Exp $
**
** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
**
** This file is part of the qcadlib Library project.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid qcadlib Professional Edition licenses may use 
** this file in accordance with the qcadlib Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.ribbonsoft.com for further details.
**
** Contact info@ribbonsoft.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/


#ifndef RS_ENTITY_H
#define RS_ENTITY_H

//#include <values.h>

#include "rs_dict.h"

#include "rs.h"
#include "rs_layer.h"
#include "rs_math.h"
#include "rs_pen.h"
#include "rs_string.h"
#include "rs_stringlist.h"
#include "rs_undoable.h"
#include "rs_vector.h"

class RS_Arc;
class RS_Block;
class RS_Circle;
class RS_Document;
class RS_EntityContainer;
class RS_Graphic;
class RS_GraphicView;
class RS_Insert;
class RS_Line;
class RS_Painter;
class RS_Point;
class RS_Polyline;
class RS_Text;



/**
 * Base class for an entity (line, arc, circle, ...)
 *
 * @author Andrew Mustun
 */
00065 class RS_Entity : public RS_Undoable {
public:


    RS_Entity(RS_EntityContainer* parent=NULL);
    virtual ~RS_Entity();

    void init();
    virtual void initId();

    virtual RS_Entity* clone() = 0;

    virtual void reparent(RS_EntityContainer* parent) {
        this->parent = parent;
    }

    void resetBorders();

    /**
     * Must be overwritten to return the rtti of this entity
     * (e.g. RS2::EntityArc).
     */
00087     virtual RS2::EntityType rtti() const {
        return RS2::EntityUnknown;
    }

    /**
     * Identify all entities as undoable entities.
     * @return RS2::UndoableEntity
     */
00095     virtual RS2::UndoableType undoRtti() {
        return RS2::UndoableEntity;
    }

    /**
     * @return Unique Id of this entity.
     */
00102     unsigned long int getId() const {
        return id;
    }

    /**
     * This method must be overwritten in subclasses and return the 
     * number of <b>atomic</b> entities in this entity.
     */
    virtual unsigned long int count() = 0;
      
    /**
     * This method must be overwritten in subclasses and return the 
     * number of <b>atomic</b> entities in this entity including sub containers.
     */
    virtual unsigned long int countDeep() = 0;


      /**
       * Implementations must return the total length of the entity
       * or a negative number if the entity has no length (e.g. a text or hatch).
       */
00123       virtual double getLength() {
            return -1.0;
      }

    /**
     * @return Parent of this entity or NULL if this is a root entity.
     */
00130     RS_EntityContainer* getParent() const {
        return parent;
    }

    /**
     * Reparents this entity.
     */
00137     void setParent(RS_EntityContainer* p) {
        parent = p;
    }

    RS_Graphic* getGraphic();
    RS_Block* getBlock();
    RS_Insert* getInsert();
    RS_Entity* getBlockOrInsert();
    RS_Document* getDocument();

    void setLayer(const RS_String& name);
    void setLayer(RS_Layer* l);
    void setLayerToActive();
    RS_Layer* getLayer(bool resolve = true) const;

    /**
     * Sets the explicit pen for this entity or a pen with special
     * attributes such as BY_LAYER, ..
     */
00156     void setPen(const RS_Pen& pen) {
        this->pen = pen;
    }
    void setPenToActive();
    RS_Pen getPen(bool resolve = true) const;

    /**
     * Must be overwritten to return true if an entity type 
     * is a container for other entities (e.g. polyline, group, ...).
     */
    virtual bool isContainer() const = 0;

    /**
     * Must be overwritten to return true if an entity type 
     * is an atomic entity.
     */
    virtual bool isAtomic() const = 0;

    /**
     * Must be overwritten to return true if an entity type 
     * is a potential edge entity of a contour. By default
    * this returns false.
     */
00179     virtual bool isEdge() const {
        return false;
    }

    /**
     * @return true for all document entities (e.g. Graphics or Blocks).
     * false otherwise.
     */
00187     virtual bool isDocument() const {
        return false;
    }

    virtual bool setSelected(bool select);
    virtual bool toggleSelected();
    virtual bool isSelected() const;
      virtual bool isParentSelected();
    virtual bool isProcessed() const;
    virtual void setProcessed(bool on);
    virtual bool isInWindow(RS_Vector v1, RS_Vector v2);
    virtual bool hasEndpointsWithinWindow(RS_Vector /*v1*/, RS_Vector /*v2*/) {
        return false;
    }
    virtual bool isVisible();
    virtual void setVisible(bool v) {
        if (v) {
            setFlag(RS2::FlagVisible);
        } else {
            delFlag(RS2::FlagVisible);
        }
    }
      virtual void setHighlighted(bool on);
      virtual bool isHighlighted();
      
    virtual bool isLocked();

    virtual void undoStateChanged(bool undone);

    /**
     * Can be implemented by child classes to update the entities
     * temporary subentities. update() is called if the entity's
     * paramters or undo state changed.
     */
00221     virtual void update() {}
      
    virtual void setUpdateEnabled(bool on) {
            updateEnabled = on;
      }

    /**
     * This method doesn't do any calculations. 
     * @return minimum coordinate of the entity.
     * @see calculateBorders()
     */
00232     RS_Vector getMin() const {
        return minV;
    }

    /**
     * This method doesn't do any calculations. 
     * @return minimum coordinate of the entity.
     * @see calculateBorders()
     */
00241     RS_Vector getMax() const {
        return maxV;
    }

    /**
     * This method returns the difference of max and min returned 
     * by the above functions. 
     * @return size of the entity.
     * @see calculateBorders()
     * @see getMin()
     * @see getMax()
     */
00253     RS_Vector getSize() const {
        return maxV-minV;
    }

    void addGraphicVariable(const RS_String& key, double val, int code);
    void addGraphicVariable(const RS_String& key, int val, int code);
    void addGraphicVariable(const RS_String& key, const RS_String& val, int code);
      
    double getGraphicVariableDouble(const RS_String& key, double def);
    int getGraphicVariableInt(const RS_String& key, int def);
    RS_String getGraphicVariableString(const RS_String& key,
                                       const RS_String& def);

      RS2::Unit getGraphicUnit();

    /**
     * Must be overwritten to get all reference points of the entity. 
     */
00271     virtual RS_VectorSolutions getRefPoints() {
            RS_VectorSolutions ret;
            return ret;
      }


    /**
     * Must be overwritten to get the closest endpoint to the 
     * given coordinate for this entity. 
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest endpoint. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest endpoint.
     */
    virtual RS_Vector getNearestEndpoint(const RS_Vector& coord,
                                         double* dist = NULL) = 0;

    /**
     * Must be overwritten to get the closest coordinate to the 
    * given coordinate which is on this entity.
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between \p coord and the point. The passed pointer can 
     * also be \p NULL in which case the distance will be lost.
     *
     * @return The closest coordinate.
     */
    virtual RS_Vector getNearestPointOnEntity(const RS_Vector& /*coord*/,
            bool onEntity = true, double* dist = NULL,
            RS_Entity** entity = NULL) = 0;

    /**
     * Must be overwritten to get the (nearest) center point to the 
     * given coordinate for this entity. 
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest center point. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest center point.
     */
    virtual RS_Vector getNearestCenter(const RS_Vector& coord,
                                       double* dist = NULL) = 0;

    /**
     * Must be overwritten to get the (nearest) middle point to the 
     * given coordinate for this entity. 
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest middle point. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest middle point.
     */
    virtual RS_Vector getNearestMiddle(const RS_Vector& coord,
                                       double* dist = NULL) = 0;

    /**
     * Must be overwritten to get the nearest point with a given
     * distance to the endpoint to the given coordinate for this entity. 
     *
     * @param distance Distance to endpoint.
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest point. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest point with the given distance to the endpoint.
     */
    virtual RS_Vector getNearestDist(double distance,
                                     const RS_Vector& coord,
                                     double* dist = NULL) = 0;
                                                       
    /**
     * Must be overwritten to get the point with a given
     * distance to the start- or endpoint to the given coordinate for this entity. 
     *
     * @param distance Distance to endpoint.
     * @param startp true = measured from Startpoint, false = measured from Endpoint
     *
     * @return The point with the given distance to the start- or endpoint.
     */
00363     virtual RS_Vector getNearestDist(double /*distance*/,
                                     bool /*startp*/) {
            return RS_Vector(false);
      }
                                                       
    /**
     * Must be overwritten to get the nearest reference point for this entity. 
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest point. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest point with the given distance to the endpoint.
     */
00379     virtual RS_Vector getNearestRef(const RS_Vector& coord,
                                     double* dist = NULL) { 
            RS_VectorSolutions s = getRefPoints();
            
            return s.getClosest(coord, dist); 
      }
      
    /**
     * Gets the nearest reference point of this entity if it is selected. 
       * Containers re-implement this method to return the nearest reference
       * point of a selected sub entity.
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param dist Pointer to a value which will contain the measured
     * distance between 'coord' and the closest point. The passed
     * pointer can also be NULL in which case the distance will be
     * lost.
     *
     * @return The closest point with the given distance to the endpoint.
     */
00399     virtual RS_Vector getNearestSelectedRef(const RS_Vector& coord,
                                     double* dist = NULL) { 
            if (isSelected()) {
                  return getNearestRef(coord, dist);
            }
            else {
                  return RS_Vector(false); 
            }
      }

    /**
     * Must be overwritten to get the shortest distance between this 
     * entity and a coordinate.
     *
     * @param coord Coordinate (typically a mouse coordinate)
     * @param entity Pointer which will contain the (sub-)entity which is 
     *               closest to the given point or NULL if the caller is not 
     *               interested in this information.
     * @param level The resolve level. 
     *
     * @sa RS2::ResolveLevel
     *
     * @return The measured distance between \p coord and the entity.
     */
    virtual double getDistanceToPoint(const RS_Vector& coord,
                                      RS_Entity** entity = NULL,
                                      RS2::ResolveLevel level = RS2::ResolveNone,
                                                        double solidDist = RS_MAXDOUBLE) = 0;

    virtual bool isPointOnEntity(const RS_Vector& coord,
                                 double tolerance=RS_TOLERANCE);

    /**
     * Implementations must move the entity by the given vector.
     */
    virtual void move(RS_Vector offset) = 0;

    /**
     * Implementations must rotate the entity by the given angle around
     * the given center.
     */
    virtual void rotate(RS_Vector center, double angle) = 0;

    /**
     * Implementations must scale the entity by the given factors.
     */
    virtual void scale(RS_Vector center, RS_Vector factor) = 0;

    /**
     * Acts like scale(RS_Vector) but with equal factors.
     * Equal to scale(center, RS_Vector(factor, factor)).
     */
00451     virtual void scale(RS_Vector center, double factor) {
        scale(center, RS_Vector(factor, factor));
    }

    /**
     * Implementations must mirror the entity by the given axis.
     */
    virtual void mirror(RS_Vector axisPoint1, RS_Vector axisPoint2) = 0;

    virtual void stretch(RS_Vector firstCorner,
                         RS_Vector secondCorner,
                         RS_Vector offset);

      /**
       * Implementations must drag the reference point(s) of all
       * (sub-)entities that are very close to ref by offset.
       */
00468       virtual void moveRef(const RS_Vector& /*ref*/, 
            const RS_Vector& /*offset*/) {
            return;
      }
      
      /**
       * Implementations must drag the reference point(s) of selected 
       * (sub-)entities that are very close to ref by offset.
       */
00477       virtual void moveSelectedRef(const RS_Vector& /*ref*/, 
            const RS_Vector& /*offset*/) {
            return;
      }

    /**
     * Implementations must draw the entity on the given device.
     */
    virtual void draw(RS_Painter* painter, RS_GraphicView* view, 
            double patternOffset) = 0;

      double getStyleFactor(RS_GraphicView* view);
      
      RS_String* getUserDefVar(RS_String key);
      RS_StringList getAllKeys();
      void setUserDefVar(RS_String key, RS_String val);
      void delUserDefVar(RS_String key);

    friend std::ostream& operator << (std::ostream& os, RS_Entity& e);

    /** Recalculates the borders of this entity. */
    virtual void calculateBorders() = 0;

protected:
    //! Entity's parent entity or NULL is this entity has no parent.
00502     RS_EntityContainer* parent;
    //! minimum coordinates
00504     RS_Vector minV;
    //! maximum coordinates
00506     RS_Vector maxV;

    //! Pointer to layer
00509     RS_Layer* layer;

    //! Entity id
00512     unsigned long int id;

    //! pen (attributes) for this entity
00515     RS_Pen pen;

      //! auto updating enabled?
00518       bool updateEnabled;

private:
      RS_Dict<RS_String> varList;
};

#endif

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