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 // - Redo rendering code to *not* use Qt's transform functions, as they are tied
  18 //   to a left-handed system and we need a right-handed one. [DONE]
  19 //
  20 // STILL TO BE DONE:
  21 //
  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         gridBackground(256, 256),
  47         scale(1.0), offsetX(-10), offsetY(-10),
  48         document(Vector(0, 0)),
  49         gridSpacing(32.0), collided(false), rotateTool(false), rx(150.0), ry(150.0),
  50         scrollDrag(false), addLineTool(false), toolAction(NULL)
  51 {
  52         setBackgroundRole(QPalette::Base);
  53         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  54
  55 //      toolPalette = new ToolWindow();
  56 //      CreateCursors();
  57 //      setCursor(cur[TOOLSelect]);
  58 //      setMouseTracking(true);
  59
  60         Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
  61         document.Add(line);
  62         document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
  63         document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
  64         document.Add(new Circle(Vector(100, 100), 36, &document));
  65         document.Add(new Circle(Vector(50, 150), 49, &document));
  66         document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
  67         document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
  68 #if 1
  69         Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), &document);
  70         line->SetDimensionOnLine(dimension);
  71         document.Add(dimension);
  72 #else
  73         // Alternate way to do the above...
  74         line->SetDimensionOnLine();
  75 #endif
  76 //      connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  77 //              SLOT(AddNewObjectToDocument(Object *)));
  78 //This works, now how to scroll it???
  79 //      QPixmap pm(256, 256);
  80         QPainter pmp(&gridBackground);
  81 #if 0
  82         pmp.fillRect(0, 0, 256, 256, Qt::lightGray);
  83
  84         pmp.fillRect(0,   64,  64, 64, Qt::darkGray);
  85         pmp.fillRect(0,   192, 64, 64, Qt::darkGray);
  86         pmp.fillRect(64,  0,   64, 64, Qt::darkGray);
  87         pmp.fillRect(64,  128, 64, 64, Qt::darkGray);
  88         pmp.fillRect(128, 64,  64, 64, Qt::darkGray);
  89         pmp.fillRect(128, 192, 64, 64, Qt::darkGray);
  90         pmp.fillRect(192, 0,   64, 64, Qt::darkGray);
  91         pmp.fillRect(192, 128, 64, 64, Qt::darkGray);
  92 #else
  93         pmp.fillRect(0, 0, 256, 256, QColor(240, 240, 240));
  94         pmp.setPen(QPen(QColor(190, 190, 255), 2.0, Qt::SolidLine));
  95         for(int i=0; i<255; i+=12)
  96                 pmp.drawLine(i, 0, i, 255);
  97         for(int i=0; i<255; i+=12)
  98                 pmp.drawLine(0, i, 255, i);
  99 #endif
 100         pmp.end();
 101         UpdateGridBackground();
 102 }
 103
 104 void DrawingView::SetRotateToolActive(bool state/*= true*/)
 105 {
 106         rotateTool = state;
 107         update();
 108 }
 109
 110 void DrawingView::SetAddLineToolActive(bool state/*= true*/)
 111 {
 112         if (state)// && toolAction == NULL)
 113         {
 114                 if (toolAction)
 115                         delete toolAction;
 116
 117                 addCircleTool = false;
 118                 toolAction = new DrawLineAction();
 119                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 120                         SLOT(AddNewObjectToDocument(Object *)));
 121         }
 122         else if (!state && addLineTool && toolAction)
 123         {
 124                 delete toolAction;
 125                 toolAction = NULL;
 126         }
 127
 128         addLineTool = state;
 129         update();
 130 //printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
 131 }
 132
 133 void DrawingView::SetAddCircleToolActive(bool state/*= true*/)
 134 {
 135         if (state)// && toolAction == NULL)
 136         {
 137                 if (toolAction)
 138                         delete toolAction;
 139
 140                 addLineTool = false;
 141                 toolAction = new DrawCircleAction();
 142                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 143                         SLOT(AddNewObjectToDocument(Object *)));
 144         }
 145         else if (!state && addCircleTool && toolAction)
 146         {
 147                 delete toolAction;
 148                 toolAction = NULL;
 149         }
 150
 151         addCircleTool = state;
 152         update();
 153 //printf("DrawingView::SetAddCircleToolActive(). toolAction=%08X\n", toolAction);
 154 }
 155
 156 void DrawingView::UpdateGridBackground(void)
 157 {
 158 #if 0
 159 // Shift the background to match our scrolling...
 160 QBrush newBrush = *backgroundBrush;
 161 //QMatrix brushMatrix = backgroundBrush->matrix();
 162 QTransform brushMatrix = backgroundBrush->transform();
 163 brushMatrix.translate(Painter::origin.x, Painter::origin.y);
 164 //brushMatrix.translate(15.0, 15.0);
 165 //backgroundBrush->setMatrix(brushMatrix);
 166 //backgroundBrush->setTransform(brushMatrix);
 167 newBrush.setTransform(brushMatrix);
 168 QPalette pal = palette();
 169 //pal.setBrush(backgroundRole(), *backgroundBrush);
 170 pal.setBrush(backgroundRole(), newBrush);
 171 setPalette(pal);
 172 //Background painting does not honor the transformation matrix (either one)...
 173 // So...
 174 #else
 175 //was: 128
 176 #define BG_BRUSH_SPAN 72
 177         // Transform the origin to Qt coordinates
 178         Vector pixmapOrigin = Painter::CartesianToQtCoords(Vector());
 179         int x = (int)pixmapOrigin.x;
 180         int y = (int)pixmapOrigin.y;
 181         // Problem with mod 128: Negative numbers screw it up... [FIXED]
 182         x = (x < 0 ? 0 : BG_BRUSH_SPAN - 1) - (x % BG_BRUSH_SPAN);
 183         y = (y < 0 ? 0 : BG_BRUSH_SPAN - 1) - (y % BG_BRUSH_SPAN);
 184
 185         // Here we grab a section of the bigger pixmap, so that the background
 186         // *looks* like it's scrolling...
 187         QPixmap pm = gridBackground.copy(x, y, BG_BRUSH_SPAN, BG_BRUSH_SPAN);
 188         QPalette pal = palette();
 189         pal.setBrush(backgroundRole(), QBrush(pm));
 190         setAutoFillBackground(true);
 191         setPalette(pal);
 192 #endif
 193 }
 194
 195 void DrawingView::AddNewObjectToDocument(Object * object)
 196 {
 197         if (object)
 198         {
 199                 object->Reparent(&document);
 200                 document.Add(object);
 201                 update();
 202         }
 203 //printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
 204 }
 205
 206 QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
 207 {
 208         // This is undoing the transform, e.g. going from client coords to local coords.
 209         // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
 210         // conversion of the y-axis from increasing bottom to top.
 211         return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
 212 }
 213
 214 QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
 215 {
 216         // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
 217         // No voodoo here, it's just grouped wrong to see it. It should be:
 218         // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
 219         return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
 220 }
 221
 222 void DrawingView::paintEvent(QPaintEvent * /*event*/)
 223 {
 224         QPainter qtPainter(this);
 225         Painter painter(&qtPainter);
 226
 227 //      qtPainter.setBackground(QBrush(Qt::DiagCrossPattern));
 228 //      qtPainter.setBackgroundMode(Qt::OpaqueMode);
 229
 230         if (useAntialiasing)
 231                 qtPainter.setRenderHint(QPainter::Antialiasing);
 232
 233         Painter::screenSize = Vector(size().width(), size().height());
 234         Object::SetViewportHeight(size().height());
 235
 236         // Draw coordinate axes
 237
 238         painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
 239         painter.DrawLine(0, -16384, 0, 16384);
 240         painter.DrawLine(-16384, 0, 16384, 0);
 241
 242         // Draw supplemental (tool related) points
 243
 244         if (rotateTool)
 245         {
 246                 painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
 247                 painter.DrawLine(rx - 10, ry, rx + 10, ry);
 248                 painter.DrawLine(rx, ry - 10, rx, ry + 10);
 249         }
 250
 251 // Maybe we can make the grid into a background brush instead, and let Qt deal
 252 // with it???
 253         // Draw grid
 254
 255 #if 0
 256         painter.setPen(QPen(QColor(90, 90, 90), 1.0, Qt::DotLine));
 257
 258         //these two loops kill performance!
 259         // Also, these overwrite our coordinate axes
 260         for(double x=0; x<size().width(); x+=gridSpacing*10.0)
 261                 painter.drawLine((int)x, -16384, (int)x, 16384);
 262
 263         for(double y=0; y<size().height(); y+=gridSpacing*10.0)
 264                 painter.drawLine(-16384, (int)y, 16384, (int)y);
 265 #endif
 266
 267         painter.SetPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 268
 269         for(double x=0; x<size().width(); x+=gridSpacing)
 270                 for(double y=0; y<size().height(); y+=gridSpacing)
 271                         painter.DrawPoint((int)x, (int)y);
 272
 273         // The top level document takes care of rendering for us...
 274         document.Draw(&painter);
 275
 276         if (toolAction)
 277                 toolAction->Draw(&painter);
 278 }
 279
 280 void DrawingView::mousePressEvent(QMouseEvent * event)
 281 {
 282         if (event->button() == Qt::LeftButton)
 283         {
 284                 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 285                 collided = document.Collided(point);
 286
 287                 if (collided)
 288                         update();       // Do an update if collided with at least *one* object in the document
 289
 290                 if (toolAction)
 291                         toolAction->MouseDown(point);
 292         }
 293         else if (event->button() == Qt::MiddleButton)
 294         {
 295                 scrollDrag = true;
 296                 oldPoint = Vector(event->x(), event->y());
 297                 // Should also change the mouse pointer as well...
 298                 setCursor(Qt::SizeAllCursor);
 299         }
 300 }
 301
 302 void DrawingView::mouseMoveEvent(QMouseEvent * event)
 303 {
 304         Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 305
 306         if (event->buttons() & Qt::MiddleButton)
 307         {
 308                 point = Vector(event->x(), event->y());
 309                 // Since we're using Qt coords for scrolling, we have to adjust them here to
 310                 // conform to Cartesian coords, since the origin is using Cartesian. :-)
 311                 Vector delta(point, oldPoint);
 312                 delta /= Painter::zoom;
 313                 delta.y = -delta.y;
 314                 Painter::origin -= delta;
 315
 316                 UpdateGridBackground();
 317                 update();
 318                 oldPoint = point;
 319                 return;
 320         }
 321
 322         // Grid processing...
 323 #if 1
 324         // This looks strange, but it's really quite simple: We want a point that's
 325         // more than half-way to the next grid point to snap there while conversely
 326         // we want a point that's less than half-way to to the next grid point then
 327         // snap to the one before it. So we add half of the grid spacing to the
 328         // point, then divide by it so that we can remove the fractional part, then
 329         // multiply it back to get back to the correct answer.
 330         if (event->buttons() & Qt::LeftButton)
 331         {
 332                 point += gridSpacing / 2.0;                                     // *This* adds to Z!!!
 333                 point /= gridSpacing;
 334                 point.x = floor(point.x);//need to fix this for negative numbers...
 335                 point.y = floor(point.y);
 336                 point.z = 0;                                                            // Make *sure* Z doesn't go anywhere!!!
 337                 point *= gridSpacing;
 338         }
 339 #endif
 340 //we should keep track of the last point here and only pass this down *if* the point
 341 //changed...
 342         document.PointerMoved(point);
 343
 344         if (document.NeedsUpdate())
 345                 update();
 346
 347         if (toolAction)
 348         {
 349                 toolAction->MouseMoved(point);
 350                 update();
 351         }
 352 }
 353
 354 void DrawingView::mouseReleaseEvent(QMouseEvent * event)
 355 {
 356         if (event->button() == Qt::LeftButton)
 357         {
 358                 document.PointerReleased();
 359
 360 //We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
 361 //could set it up to use the document's update function (assumes that all object updates
 362 //are being reported correctly:
 363 //              if (document.NeedsUpdate())
 364 //              if (collided)
 365                         update();       // Do an update if collided with at least *one* object in the document
 366
 367                 if (toolAction)
 368                         toolAction->MouseReleased();
 369         }
 370         else if (event->button() == Qt::MiddleButton)
 371         {
 372                 scrollDrag = false;
 373                 setCursor(Qt::ArrowCursor);
 374         }
 375 }