[architektonas] / src / dimension.cpp

// dimension.cpp: Dimension object
//
// Part of the Architektonas Project
// (C) 2011 Underground Software
// See the README and GPLv3 files for licensing and warranty information
//
// JLH = James Hammons <jlhamm@acm.org>
//
// WHO  WHEN        WHAT
// ---  ----------  ------------------------------------------------------------
// JLH  04/04/2011  Created this file, basic rendering
// JLH  03/14/2013  Updated to new connection system
//

#include "dimension.h"

#include <QtGui>
#include "geometry.h"
#include "mathconstants.h"
#include "painter.h"


Dimension::Dimension(Vector p1, Vector p2, DimensionType dt/*= DTLinear*/, Object * p/*= NULL*/):
        Object(p1, p), endpoint(p2),
        dragging(false), draggingHandle1(false), draggingHandle2(false),
        length(p2.Magnitude()), dimensionType(dt), size(0.25), point1(NULL), point2(NULL)
{
        // We set the size to 1/4 base unit. Could be anything.
        type = OTDimension;
}


// This is bad, p1 & p2 could be NULL, causing much consternation...
Dimension::Dimension(Connection p1, Connection p2, DimensionType dt/*= DTLinear*/, Object * p/*= NULL*/):
        dragging(false), draggingHandle1(false), draggingHandle2(false),
        length(0), dimensionType(dt), size(0.25), point1(p1), point2(p2)
{
        type = OTDimension;
}


Dimension::~Dimension()
{
}


/*
The approach used below creates a hierarchy: Dimension is subservient to Line.

Does this solve our problem of connected objects? Maybe, partially. Let's think this
through. It only works for endpoints, not points in the middle...

Also: this is bad, depending on the Draw() function to update the internal
      position(s) of the data of the object! (is it though?)

How to move: click once moves only the object/point clicked on, all connected
objects deform themselves accordingly. click twice selects ALL connected objects;
all objects move as a unified whole.

*/

/*virtual*/ void Dimension::Draw(Painter * painter)
{
#if 0
        // If there are valid Vector pointers in here, use them to update the internal
        // positions. Otherwise, we just use the internal positions by default.
        if (point1.object)
                position = point1.object->GetPointAtParameter(point1.t);

        if (point2.object)
                endpoint = point2.object->GetPointAtParameter(point2.t);
#endif

        painter->SetPen(QPen(Qt::magenta, 2.0, Qt::DotLine));

        if ((state == OSSelected) || ((state == OSInactive) && hitPoint1))
                painter->DrawHandle(position);

        if ((state == OSSelected) || ((state == OSInactive) && hitPoint2))
                painter->DrawHandle(endpoint);
#if 1
        if (state == OSSelected)
                painter->SetPen(QPen(Qt::cyan, 1.0 * Painter::zoom * size, Qt::SolidLine));
        else
//              painter->SetPen(QPen(Qt::blue, 1.0, Qt::SolidLine));
#endif
                painter->SetPen(QPen(Qt::blue, 1.0 * Painter::zoom * size, Qt::SolidLine));

        painter->SetBrush(QBrush(QColor(Qt::blue)));

        // Draw an aligned dimension line
        double angle = Vector(endpoint - position).Angle();
        double orthoAngle = angle + (PI / 2.0);
        Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
        Vector unit = Vector(endpoint - position).Unit();

// Arrowhead:
//      Point p1 = head - (unit * 9.0 * size);
//      Point p2 = p1 + (orthogonal * 3.0 * size);
//      Point p3 = p1 - (orthogonal * 3.0 * size);

/*
The numbers hardcoded into here, what are they?
I believe they are pixels.
*/

        // Get our line parallel to our points
        Point p1 = position + (orthogonal * 10.0 * size);
        Point p2 = endpoint + (orthogonal * 10.0 * size);

        Point p3 = position + (orthogonal * 16.0 * size);
        Point p4 = endpoint + (orthogonal * 16.0 * size);
        Point p5 = position + (orthogonal * 4.0 * size);
        Point p6 = endpoint + (orthogonal * 4.0 * size);

        // Draw extension lines
        painter->DrawLine(p3, p5);
        painter->DrawLine(p4, p6);

        // Calculate whether or not the arrowheads are too crowded to put inside
        // the extension lines. 9.0 is the length of the arrowhead.
//      double t = Vector::Parameter(position, endpoint, endpoint - (unit * 9.0 * size));
        double t = Geometry::ParameterOfLineAndPoint(position, endpoint, endpoint - (unit * 9.0 * size));
//printf("Dimension::Draw(): t = %lf\n", t);

// On the screen, it's acting like this is actually 58%...
// This is correct, we want it to happen at > 50%
        if (t > 0.58)
        {
                // Draw main dimension line + arrowheads
                painter->DrawLine(p1, p2);
                painter->DrawArrowhead(p1, p2, size);
                painter->DrawArrowhead(p2, p1, size);
        }
        else
        {
                // Draw outside arrowheads
                Point p7 = p1 - (unit * 9.0 * size);
                Point p8 = p2 + (unit * 9.0 * size);
                painter->DrawArrowhead(p1, p7, size);
                painter->DrawArrowhead(p2, p8, size);
                painter->DrawLine(p1, p1 - (unit * 14.0 * size));
                painter->DrawLine(p2, p2 + (unit * 14.0 * size));
        }

        // Draw length of dimension line...
        painter->SetFont(QFont("Arial", 8.0 * Painter::zoom * size));
        Vector v1((p1.x - p2.x) / 2.0, (p1.y - p2.y) / 2.0);
        Point ctr = p2 + v1;

#if 0
        QString dimText = QString("%1\"").arg(Vector(endpoint - position).Magnitude());
#else
        QString dimText;
        double length = Vector(endpoint - position).Magnitude();

        if (length < 12.0)
                dimText = QString("%1\"").arg(length);
        else
        {
                double feet = (double)((int)length / 12);
                double inches = length - (feet * 12.0);

                if (inches == 0)
                        dimText = QString("%1'").arg(feet);
                else
                        dimText = QString("%1' %2\"").arg(feet).arg(inches);
        }
#endif

        painter->DrawAngledText(ctr, angle, dimText, size);
}


/*virtual*/ Vector Dimension::Center(void)
{
        // Technically, this is the midpoint but who are we to quibble? :-)
        Vector v((position.x - endpoint.x) / 2.0, (position.y - endpoint.y) / 2.0);
        return endpoint + v;
}


/*virtual*/ bool Dimension::Collided(Vector point)
{
        // Someone told us to fuck off, so we'll fuck off. :-)
        if (ignoreClicks)
                return false;

        // We can assume this, since this is a mouse down event here.
        objectWasDragged = false;
        HitTest(point);

        // Now that we've done our hit testing on the non-snapped point, snap it if
        // necessary...
        if (snapToGrid)
                point = SnapPointToGrid(point);

        if (hitPoint1)
        {
                oldState = state;
                state = OSSelected;
                oldPoint = position;
                draggingHandle1 = true;
                return true;
        }
        else if (hitPoint2)
        {
                oldState = state;
                state = OSSelected;
                oldPoint = endpoint;
                draggingHandle2 = true;
                return true;
        }

        state = OSInactive;
        return false;
}


/*virtual*/ void Dimension::PointerMoved(Vector point)
{
        if (selectionInProgress)
        {
                // Check for whether or not the rect contains this line
                if (selection.contains(position.x, position.y)
                        && selection.contains(endpoint.x, endpoint.y))
                        state = OSSelected;
                else
                        state = OSInactive;

                return;
        }

        // Hit test tells us what we hit (if anything) through boolean variables. (It
        // also tells us whether or not the state changed. --not any more)
        SaveHitState();
        HitTest(point);
        needUpdate = HitStateChanged();

        objectWasDragged = (/*draggingLine |*/ draggingHandle1 | draggingHandle2);

        if (objectWasDragged)
        {
                Vector delta = point - oldPoint;

                if (draggingHandle1)// || draggingLine)
                        position += delta;

                if (draggingHandle2)// || draggingLine)
                        endpoint += delta;

                oldPoint = point;
                needUpdate = true;
        }
}


/*virtual*/ void Dimension::PointerReleased(void)
{
/*      if (draggingHandle1 || draggingHandle2)
        {
                // Set the length (in case the global state was set to fixed (or not))
                if (Object::fixedLength)
                {

                        if (draggingHandle1)    // startpoint
                        {
                                Vector v = Vector(endpoint, position).Unit() * length;
                                position = endpoint + v;
                        }
                        else                                    // endpoint
                        {
                                Vector v = Vector(position, endpoint).Unit() * length;
                                endpoint = position + v;
                        }
                }
                else*/
                {
                        // Otherwise, we calculate the new length, just in case on the next move
                        // it turns out to have a fixed length. :-)
                        length = Vector(endpoint - position).Magnitude();
                }
/*      }*/

        dragging = false;
        draggingHandle1 = false;
        draggingHandle2 = false;

        // Here we check for just a click: If object was clicked and dragged, then
        // revert to the old state (OSInactive). Otherwise, keep the new state that
        // we set.
/*Maybe it would be better to just check for "object was dragged" state and not have to worry
about keeping track of old states...
*/
        if (objectWasDragged)
                state = oldState;
}


/*virtual*/ bool Dimension::HitTest(Point point)
{
        hitPoint1 = hitPoint2 = false;
//      Vector lineSegment(position, endpoint);
        Vector v1(position, point);
        Vector v2(endpoint, point);
//      double t = Geometry::ParameterOfLineAndPoint(position, endpoint, point);
//      double distance;

//      if (t < 0.0)
//              distance = v1.Magnitude();
//      else if (t > 1.0)
//              distance = v2.Magnitude();
//      else
                // distance = ?Det?(ls, v1) / |ls|
//              distance = fabs((lineSegment.x * v1.y - v1.x * lineSegment.y)
//                      / lineSegment.Magnitude());

        if ((v1.Magnitude() * Painter::zoom) < 8.0)
                hitPoint1 = true;
        else if ((v2.Magnitude() * Painter::zoom) < 8.0)
                hitPoint2 = true;

        return (hitPoint1 || hitPoint2 ? true : false);
}


void Dimension::SaveHitState(void)
{
        oldHitPoint1 = hitPoint1;
        oldHitPoint2 = hitPoint2;
//      oldHitLine = hitLine;
}


bool Dimension::HitStateChanged(void)
{
        if ((hitPoint1 != oldHitPoint1) || (hitPoint2 != oldHitPoint2))
                return true;

        return false;
}


/*virtual*/ void Dimension::Enumerate(FILE * file)
{
        fprintf(file, "DIMENSION %i (%lf,%lf) (%lf,%lf) %i\n", layer, position.x, position.y, endpoint.x, endpoint.y, type);
}


/*virtual*/ Object * Dimension::Copy(void)
{
#warning "!!! This doesn't take care of attached Dimensions !!!"
/*
This is a real problem. While having a pointer in the Dimension to this line's points
is fast & easy, it creates a huge problem when trying to replicate an object like this.

Maybe a way to fix that then, is to have reference numbers instead of pointers. That
way, if you copy them, ... you might still have problems. Because you can't be sure if
a copy will be persistant or not, you then *definitely* do not want them to have the
same reference number.
*/

        Dimension * d = new Dimension(position, endpoint, dimensionType, parent);
        d->size = size;
        return d;
}


// Dimensions are special: they contain exactly *two* points. Here, we check
// only for zero/non-zero in returning the correct points.
/*virtual*/ Vector Dimension::GetPointAtParameter(double parameter)
{
        if (parameter == 0)
                return position;

        return endpoint;
}


/*virtual*/ void Dimension::MovePointAtParameter(double parameter, Vector v)
{
        if (parameter == 0)
                position += v;
        else if (parameter == 1.0)
                endpoint += v;
        else
                {} // Not sure how to handle this case :-P
}


/*virtual*/ void Dimension::Connect(Object * obj, double param)
{
        // There are four possibilities here...
        // The param is only looking for 0 or 1 here.
        if (point1.object == NULL && point2.object == NULL)
        {
                point1.object = obj;
                point1.t = param;
        }
        else if (point1.object == NULL && point2.object != NULL)
        {
                if (point2.t == param)
                        point2.object = obj;
                else
                {
                        point1.object = obj;
                        point1.t = param;
                }
        }
        else if (point1.object != NULL && point2.object == NULL)
        {
                if (point1.t == param)
                        point1.object = obj;
                else
                {
                        point2.object = obj;
                        point2.t = param;
                }
        }
        else if (point1.object != NULL && point2.object != NULL)
        {
                if (point1.t == param)
                        point1.object = obj;
                else
                        point2.object = obj;
        }
}


/*virtual*/ void Dimension::Disconnect(Object * obj, double param)
{
        if (point1.object == obj && point1.t == param)
                point1.object = NULL;
        else if (point2.object == obj && point2.t == param)
                point2.object = NULL;
}


/*virtual*/ void Dimension::DisconnectAll(Object * obj)
{
        if (point1.object == obj)
                point1.object = NULL;

        if (point2.object == obj)
                point2.object = NULL;
}


/*virtual*/ QRectF Dimension::Extents(void)
{
        Point p1 = position;
        Point p2 = endpoint;

        if (point1.object)
                p1 = point1.object->GetPointAtParameter(point1.t);

        if (point2.object)
                p2 = point2.object->GetPointAtParameter(point2.t);

        return QRectF(QPointF(p1.x, p1.y), QPointF(p2.x, p2.y));
}


#if 0
/*virtual*/ ObjectType Dimension::Type(void)
{
        return OTDimension;
}
#endif


void Dimension::FlipSides(void)
{
#if 0
        Vector tmp = position;
        position = endpoint;
        endpoint = tmp;
#else
        Connection tmp = point1;
        point1 = point2;
        point2 = tmp;
//      double tmp = point1.t;
//      point1.t = point2.t;
//      point2.t = tmp;
//      Object * tmp = point1.object;
//      point1.object = point2.object;
//      point2.object = tmp;
#endif
        needUpdate = true;
}