Shamusworld >> Repos - architektonas/blob - src/drawingview.cpp

   1 // drawingview.cpp
   2 //
   3 // Part of the Architektonas Project
   4 // (C) 2011 Underground Software
   5 // See the README and GPLv3 files for licensing and warranty information
   6 //
   7 // JLH = James Hammons <jlhamm@acm.org>
   8 //
   9 // Who  When        What
  10 // ---  ----------  -------------------------------------------------------------
  11 // JLH  03/22/2011  Created this file
  12 // JLH  09/29/2011  Added middle mouse button panning
  13 //
  14
  15 // FIXED:
  16 //
  17 //
  18 // STILL TO BE DONE:
  19 //
  20 // - Redo rendering code to *not* use Qt's transform functions, as they are tied
  21 //   to a left-handed system and we need a right-handed one.
  22 //
  23
  24 // Uncomment this for debugging...
  25 //#define DEBUG
  26 //#define DEBUGFOO                              // Various tool debugging...
  27 //#define DEBUGTP                               // Toolpalette debugging...
  28
  29 #include "drawingview.h"
  30
  31 #include <stdint.h>
  32 #include "mathconstants.h"
  33
  34 #include "arc.h"
  35 #include "circle.h"
  36 #include "dimension.h"
  37 #include "drawcircleaction.h"
  38 #include "drawlineaction.h"
  39 #include "line.h"
  40 #include "painter.h"
  41
  42
  43 DrawingView::DrawingView(QWidget * parent/*= NULL*/): QWidget(parent),
  44         // The value in the settings file will override this.
  45         useAntialiasing(true),
  46         scale(1.0), offsetX(-10), offsetY(-10),
  47         document(Vector(0, 0)),
  48         gridSpacing(32.0), collided(false), rotateTool(false), rx(150.0), ry(150.0),
  49         scrollDrag(false), addLineTool(false), toolAction(NULL)
  50 {
  51         setBackgroundRole(QPalette::Base);
  52         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  53
  54 //      toolPalette = new ToolWindow();
  55 //      CreateCursors();
  56 //      setCursor(cur[TOOLSelect]);
  57 //      setMouseTracking(true);
  58
  59         Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
  60         document.Add(line);
  61         document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
  62         document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
  63         document.Add(new Circle(Vector(100, 100), 36, &document));
  64         document.Add(new Circle(Vector(50, 150), 49, &document));
  65         document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
  66         document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
  67 #if 1
  68         Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), &document);
  69         line->SetDimensionOnLine(dimension);
  70         document.Add(dimension);
  71 #else
  72         // Alternate way to do the above...
  73         line->SetDimensionOnLine();
  74 #endif
  75 //      connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  76 //              SLOT(AddNewObjectToDocument(Object *)));
  77 }
  78
  79 void DrawingView::SetRotateToolActive(bool state/*= true*/)
  80 {
  81         rotateTool = state;
  82         update();
  83 }
  84
  85 void DrawingView::SetAddLineToolActive(bool state/*= true*/)
  86 {
  87         if (state && toolAction == NULL)
  88         {
  89                 toolAction = new DrawLineAction();
  90                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  91                         SLOT(AddNewObjectToDocument(Object *)));
  92         }
  93         else if (!state && toolAction)
  94         {
  95                 delete toolAction;
  96                 toolAction = NULL;
  97         }
  98
  99         addLineTool = state;
 100         update();
 101 //printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
 102 }
 103
 104 void DrawingView::SetAddCircleToolActive(bool state/*= true*/)
 105 {
 106         if (state && toolAction == NULL)
 107         {
 108                 toolAction = new DrawCircleAction();
 109                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 110                         SLOT(AddNewObjectToDocument(Object *)));
 111         }
 112         else if (!state && toolAction)
 113         {
 114                 delete toolAction;
 115                 toolAction = NULL;
 116         }
 117
 118         addCircleTool = state;
 119         update();
 120 //printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
 121 }
 122
 123 void DrawingView::AddNewObjectToDocument(Object * object)
 124 {
 125         if (object)
 126         {
 127                 object->Reparent(&document);
 128                 document.Add(object);
 129                 update();
 130         }
 131 //printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
 132 }
 133
 134 QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
 135 {
 136         // This is undoing the transform, e.g. going from client coords to local coords.
 137         // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
 138         // conversion of the y-axis from increasing bottom to top.
 139         return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
 140 }
 141
 142 QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
 143 {
 144         // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
 145         // No voodoo here, it's just grouped wrong to see it. It should be:
 146         // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
 147         return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
 148 }
 149
 150 void DrawingView::paintEvent(QPaintEvent * /*event*/)
 151 {
 152         QPainter qtPainter(this);
 153         Painter painter(&qtPainter);
 154
 155         if (useAntialiasing)
 156                 qtPainter.setRenderHint(QPainter::Antialiasing);
 157
 158         Painter::screenSize = Vector(size().width(), size().height());
 159         Object::SetViewportHeight(size().height());
 160
 161         // Draw coordinate axes
 162
 163         painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
 164         painter.DrawLine(0, -16384, 0, 16384);
 165         painter.DrawLine(-16384, 0, 16384, 0);
 166
 167         // Draw supplemental (tool related) points
 168
 169         if (rotateTool)
 170         {
 171                 painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
 172                 painter.DrawLine(rx - 10, ry, rx + 10, ry);
 173                 painter.DrawLine(rx, ry - 10, rx, ry + 10);
 174         }
 175
 176 // Maybe we can make the grid into a background brush instead, and let Qt deal
 177 // with it???
 178         // Draw grid
 179
 180 #if 0
 181         painter.setPen(QPen(QColor(90, 90, 90), 1.0, Qt::DotLine));
 182
 183         //these two loops kill performance!
 184         // Also, these overwrite our coordinate axes
 185         for(double x=0; x<size().width(); x+=gridSpacing*10.0)
 186                 painter.drawLine((int)x, -16384, (int)x, 16384);
 187
 188         for(double y=0; y<size().height(); y+=gridSpacing*10.0)
 189                 painter.drawLine(-16384, (int)y, 16384, (int)y);
 190 #endif
 191
 192         painter.SetPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 193
 194         for(double x=0; x<size().width(); x+=gridSpacing)
 195                 for(double y=0; y<size().height(); y+=gridSpacing)
 196                         painter.DrawPoint((int)x, (int)y);
 197
 198         // The top level document takes care of rendering for us...
 199         document.Draw(&painter);
 200
 201         if (toolAction)
 202                 toolAction->Draw(&painter);
 203 }
 204
 205 void DrawingView::mousePressEvent(QMouseEvent * event)
 206 {
 207         if (event->button() == Qt::LeftButton)
 208         {
 209                 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 210                 collided = document.Collided(point);
 211
 212                 if (collided)
 213                         update();       // Do an update if collided with at least *one* object in the document
 214
 215                 if (toolAction)
 216                         toolAction->MouseDown(point);
 217         }
 218         else if (event->button() == Qt::MiddleButton)
 219         {
 220                 scrollDrag = true;
 221                 oldPoint = Vector(event->x(), event->y());
 222                 // Should also change the mouse pointer as well...
 223                 setCursor(Qt::SizeAllCursor);
 224         }
 225 }
 226
 227 void DrawingView::mouseMoveEvent(QMouseEvent * event)
 228 {
 229         Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 230
 231         if (event->buttons() & Qt::MiddleButton)
 232         {
 233                 point = Vector(event->x(), event->y());
 234                 // Since we're using Qt coords for scrolling, we have to adjust them here to
 235                 // conform to Cartesian coords, since the origin is using Cartesian. :-)
 236                 Vector delta(point, oldPoint);
 237                 delta /= Painter::zoom;
 238                 delta.y = -delta.y;
 239                 Painter::origin -= delta;
 240                 update();
 241                 oldPoint = point;
 242                 return;
 243         }
 244
 245         // Grid processing...
 246 #if 1
 247         // This looks strange, but it's really quite simple: We want a point that's
 248         // more than half-way to the next grid point to snap there while conversely
 249         // we want a point that's less than half-way to to the next grid point then
 250         // snap to the one before it. So we add half of the grid spacing to the
 251         // point, then divide by it so that we can remove the fractional part, then
 252         // multiply it back to get back to the correct answer.
 253         if (event->buttons() & Qt::LeftButton)
 254         {
 255                 point += gridSpacing / 2.0;                                     // *This* adds to Z!!!
 256                 point /= gridSpacing;
 257                 point.x = floor(point.x);//need to fix this for negative numbers...
 258                 point.y = floor(point.y);
 259                 point.z = 0;                                                            // Make *sure* Z doesn't go anywhere!!!
 260                 point *= gridSpacing;
 261         }
 262 #endif
 263 //we should keep track of the last point here and only pass this down *if* the point
 264 //changed...
 265         document.PointerMoved(point);
 266
 267         if (document.NeedsUpdate())
 268                 update();
 269
 270         if (toolAction)
 271         {
 272                 toolAction->MouseMoved(point);
 273                 update();
 274         }
 275 }
 276
 277 void DrawingView::mouseReleaseEvent(QMouseEvent * event)
 278 {
 279         if (event->button() == Qt::LeftButton)
 280         {
 281                 document.PointerReleased();
 282
 283 //We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
 284 //could set it up to use the document's update function (assumes that all object updates
 285 //are being reported correctly:
 286 //              if (document.NeedsUpdate())
 287 //              if (collided)
 288                         update();       // Do an update if collided with at least *one* object in the document
 289
 290                 if (toolAction)
 291                         toolAction->MouseReleased();
 292         }
 293         else if (event->button() == Qt::MiddleButton)
 294         {
 295                 scrollDrag = false;
 296                 setCursor(Qt::ArrowCursor);
 297         }
 298 }