[architektonas] / src / drawingview.cpp

// drawingview.cpp
//
// Part of the Architektonas Project
// (C) 2011 Underground Software
// See the README and GPLv3 files for licensing and warranty information
//
// JLH = James L. Hammons <jlhamm@acm.org>
//
// Who  When        What
// ---  ----------  -------------------------------------------------------------
// JLH  03/22/2011  Created this file
// JLH  09/29/2011  Added middle mouse button panning
//

// FIXED:
//
//
// STILL TO BE DONE:
//
// - Redo rendering code to *not* use Qt's transform functions, as they are tied
//   to a left-handed system and we need a right-handed one.
//

// Uncomment this for debugging...
//#define DEBUG
//#define DEBUGFOO                              // Various tool debugging...
//#define DEBUGTP                               // Toolpalette debugging...

#include "drawingview.h"

#include <stdint.h>
#include "mathconstants.h"

#include "arc.h"
#include "circle.h"
#include "dimension.h"
#include "drawlineaction.h"
#include "line.h"
#include "painter.h"


DrawingView::DrawingView(QWidget * parent/*= NULL*/): QWidget(parent),
        // The value in the settings file will override this.
        useAntialiasing(true),
        scale(1.0), offsetX(-10), offsetY(-10),
        document(Vector(0, 0)),
        gridSpacing(32.0), collided(false), rotateTool(false), rx(150.0), ry(150.0),
        scrollDrag(false), addLineTool(false), toolAction(NULL)
{
        setBackgroundRole(QPalette::Base);
        setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

//      toolPalette = new ToolWindow();
//      CreateCursors();
//      setCursor(cur[TOOLSelect]);
//      setMouseTracking(true);

        Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
        document.Add(line);
        document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
        document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
        document.Add(new Circle(Vector(100, 100), 36, &document));
        document.Add(new Circle(Vector(50, 150), 49, &document));
        document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
        document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
#if 1
        Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), &document);
        line->SetDimensionOnLine(dimension);
        document.Add(dimension);
#else
        // Alternate way to do the above...
        line->SetDimensionOnLine();
#endif
//      connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
//              SLOT(AddNewObjectToDocument(Object *)));
}

void DrawingView::SetRotateToolActive(bool state/*= true*/)
{
        rotateTool = state;
        update();
}

void DrawingView::SetAddLineToolActive(bool state/*= true*/)
{
        if (state && toolAction == NULL)
        {
                toolAction = new DrawLineAction();
                connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
                        SLOT(AddNewObjectToDocument(Object *)));
        }
        else if (!state && toolAction)
        {
                delete toolAction;
                toolAction = NULL;
        }

        addLineTool = state;
        update();
//printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
}

void DrawingView::AddNewObjectToDocument(Object * object)
{
        if (object)
        {
                object->Reparent(&document);
                document.Add(object);
                update();
        }
//printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
}

QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
{
        // This is undoing the transform, e.g. going from client coords to local coords.
        // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
        // conversion of the y-axis from increasing bottom to top.
        return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
}

QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
{
        // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
        // No voodoo here, it's just grouped wrong to see it. It should be:
        // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
        return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
}

void DrawingView::paintEvent(QPaintEvent * /*event*/)
{
        QPainter qtPainter(this);
        Painter painter(&qtPainter);

        if (useAntialiasing)
                qtPainter.setRenderHint(QPainter::Antialiasing);

        Painter::screenSize = Vector(size().width(), size().height());
        Object::SetViewportHeight(size().height());

        // Draw coordinate axes

        painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
        painter.DrawLine(0, -16384, 0, 16384);
        painter.DrawLine(-16384, 0, 16384, 0);

        // Draw supplemental (tool related) points

        if (rotateTool)
        {
                painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
                painter.DrawLine(rx - 10, ry, rx + 10, ry);
                painter.DrawLine(rx, ry - 10, rx, ry + 10);
        }

// Maybe we can make the grid into a background brush instead, and let Qt deal
// with it???
        // Draw grid

#if 0
        painter.setPen(QPen(QColor(90, 90, 90), 1.0, Qt::DotLine));

        //these two loops kill performance!
        // Also, these overwrite our coordinate axes
        for(double x=0; x<size().width(); x+=gridSpacing*10.0)
                painter.drawLine((int)x, -16384, (int)x, 16384);

        for(double y=0; y<size().height(); y+=gridSpacing*10.0)
                painter.drawLine(-16384, (int)y, 16384, (int)y);
#endif

        painter.SetPen(QPen(Qt::black, 1.0, Qt::SolidLine));

        for(double x=0; x<size().width(); x+=gridSpacing)
                for(double y=0; y<size().height(); y+=gridSpacing)
                        painter.DrawPoint((int)x, (int)y);

        // The top level document takes care of rendering for us...
        document.Draw(&painter);

        if (toolAction)
                toolAction->Draw(&painter);
}

void DrawingView::mousePressEvent(QMouseEvent * event)
{
        if (event->button() == Qt::LeftButton)
        {
                Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
                collided = document.Collided(point);

                if (collided)
                        update();       // Do an update if collided with at least *one* object in the document

                if (toolAction)
                        toolAction->MouseDown(point);
        }
        else if (event->button() == Qt::MiddleButton)
        {
                scrollDrag = true;
                oldPoint = Vector(event->x(), event->y());
                // Should also change the mouse pointer as well...
                setCursor(Qt::SizeAllCursor);
        }
}

void DrawingView::mouseMoveEvent(QMouseEvent * event)
{
        Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));

        if (event->buttons() & Qt::MiddleButton)
        {
                point = Vector(event->x(), event->y());
                // Since we're using Qt coords for scrolling, we have to adjust them here to
                // conform to Cartesian coords, since the origin is using Cartesian. :-)
                Vector delta(point, oldPoint);
                delta /= Painter::zoom;
                delta.y = -delta.y;
                Painter::origin -= delta;
                update();
                oldPoint = point;
                return;
        }

        // Grid processing...
#if 1
        // This looks strange, but it's really quite simple: We want a point that's
        // more than half-way to the next grid point to snap there while conversely
        // we want a point that's less than half-way to to the next grid point then
        // snap to the one before it. So we add half of the grid spacing to the
        // point, then divide by it so that we can remove the fractional part, then
        // multiply it back to get back to the correct answer.
        if (event->buttons() & Qt::LeftButton)
        {
                point += gridSpacing / 2.0;                                     // *This* adds to Z!!!
                point /= gridSpacing;
                point.x = floor(point.x);//need to fix this for negative numbers...
                point.y = floor(point.y);
                point.z = 0;                                                            // Make *sure* Z doesn't go anywhere!!!
                point *= gridSpacing;
        }
#endif
//we should keep track of the last point here and only pass this down *if* the point
//changed...
        document.PointerMoved(point);

        if (document.NeedsUpdate())
                update();

        if (toolAction)
        {
                toolAction->MouseMoved(point);
                update();
        }
}

void DrawingView::mouseReleaseEvent(QMouseEvent * event)
{
        if (event->button() == Qt::LeftButton)
        {
                document.PointerReleased();

//We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
//could set it up to use the document's update function (assumes that all object updates
//are being reported correctly:
//              if (document.NeedsUpdate())
//              if (collided)
                        update();       // Do an update if collided with at least *one* object in the document

                if (toolAction)
                        toolAction->MouseReleased();
        }
        else if (event->button() == Qt::MiddleButton)
        {
                scrollDrag = false;
                setCursor(Qt::ArrowCursor);
        }
}