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         gridSpacing(12.0), collided(false), rotateTool(false), rx(150.0), ry(150.0),
  51         scrollDrag(false), addLineTool(false), toolAction(NULL)
  52 {
  53         setBackgroundRole(QPalette::Base);
  54         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  55
  56 //      toolPalette = new ToolWindow();
  57 //      CreateCursors();
  58 //      setCursor(cur[TOOLSelect]);
  59 //      setMouseTracking(true);
  60
  61         Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
  62         document.Add(line);
  63         document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
  64         document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
  65         document.Add(new Circle(Vector(100, 100), 36, &document));
  66         document.Add(new Circle(Vector(50, 150), 49, &document));
  67         document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
  68         document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
  69 #if 1
  70         Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), &document);
  71         line->SetDimensionOnLine(dimension);
  72         document.Add(dimension);
  73 #else
  74         // Alternate way to do the above...
  75         line->SetDimensionOnLine();
  76 #endif
  77 //      connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
  78 //              SLOT(AddNewObjectToDocument(Object *)));
  79 //This works, now how to scroll it???
  80 //      QPixmap pm(256, 256);
  81         QPainter pmp(&gridBackground);
  82 #if 0
  83         pmp.fillRect(0, 0, 256, 256, Qt::lightGray);
  84
  85         pmp.fillRect(0,   64,  64, 64, Qt::darkGray);
  86         pmp.fillRect(0,   192, 64, 64, Qt::darkGray);
  87         pmp.fillRect(64,  0,   64, 64, Qt::darkGray);
  88         pmp.fillRect(64,  128, 64, 64, Qt::darkGray);
  89         pmp.fillRect(128, 64,  64, 64, Qt::darkGray);
  90         pmp.fillRect(128, 192, 64, 64, Qt::darkGray);
  91         pmp.fillRect(192, 0,   64, 64, Qt::darkGray);
  92         pmp.fillRect(192, 128, 64, 64, Qt::darkGray);
  93 #else
  94         pmp.fillRect(0, 0, 256, 256, QColor(240, 240, 240));
  95         pmp.setPen(QPen(QColor(210, 210, 255), 2.0, Qt::SolidLine));
  96         for(int i=0; i<255; i+=12)
  97                 pmp.drawLine(i, 0, i, 255);
  98         for(int i=0; i<255; i+=12)
  99                 pmp.drawLine(0, i, 255, i);
 100 #endif
 101         pmp.end();
 102         UpdateGridBackground();
 103 }
 104
 105 void DrawingView::SetRotateToolActive(bool state/*= true*/)
 106 {
 107         rotateTool = state;
 108         update();
 109 }
 110
 111 void DrawingView::SetAddLineToolActive(bool state/*= true*/)
 112 {
 113         if (state)// && toolAction == NULL)
 114         {
 115                 if (toolAction)
 116                         delete toolAction;
 117
 118                 addCircleTool = false;
 119                 toolAction = new DrawLineAction();
 120                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 121                         SLOT(AddNewObjectToDocument(Object *)));
 122         }
 123         else if (!state && addLineTool && toolAction)
 124         {
 125                 delete toolAction;
 126                 toolAction = NULL;
 127         }
 128
 129         addLineTool = state;
 130         update();
 131 //printf("DrawingView::SetAddLineToolActive(). toolAction=%08X\n", toolAction);
 132 }
 133
 134 void DrawingView::SetAddCircleToolActive(bool state/*= true*/)
 135 {
 136         if (state)// && toolAction == NULL)
 137         {
 138                 if (toolAction)
 139                         delete toolAction;
 140
 141                 addLineTool = false;
 142                 toolAction = new DrawCircleAction();
 143                 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
 144                         SLOT(AddNewObjectToDocument(Object *)));
 145         }
 146         else if (!state && addCircleTool && toolAction)
 147         {
 148                 delete toolAction;
 149                 toolAction = NULL;
 150         }
 151
 152         addCircleTool = state;
 153         update();
 154 //printf("DrawingView::SetAddCircleToolActive(). toolAction=%08X\n", toolAction);
 155 }
 156
 157 void DrawingView::UpdateGridBackground(void)
 158 {
 159 #if 0
 160 // Shift the background to match our scrolling...
 161 QBrush newBrush = *backgroundBrush;
 162 //QMatrix brushMatrix = backgroundBrush->matrix();
 163 QTransform brushMatrix = backgroundBrush->transform();
 164 brushMatrix.translate(Painter::origin.x, Painter::origin.y);
 165 //brushMatrix.translate(15.0, 15.0);
 166 //backgroundBrush->setMatrix(brushMatrix);
 167 //backgroundBrush->setTransform(brushMatrix);
 168 newBrush.setTransform(brushMatrix);
 169 QPalette pal = palette();
 170 //pal.setBrush(backgroundRole(), *backgroundBrush);
 171 pal.setBrush(backgroundRole(), newBrush);
 172 setPalette(pal);
 173 //Background painting does not honor the transformation matrix (either one)...
 174 // So...
 175 #else
 176 //was: 128
 177 #define BG_BRUSH_SPAN 72
 178         // Transform the origin to Qt coordinates
 179         Vector pixmapOrigin = Painter::CartesianToQtCoords(Vector());
 180         int x = (int)pixmapOrigin.x;
 181         int y = (int)pixmapOrigin.y;
 182         // Use mod arithmetic to grab the correct swatch of background
 183         // Problem with mod 128: Negative numbers screw it up... [FIXED]
 184         x = (x < 0 ? 0 : BG_BRUSH_SPAN - 1) - (x % BG_BRUSH_SPAN);
 185         y = (y < 0 ? 0 : BG_BRUSH_SPAN - 1) - (y % BG_BRUSH_SPAN);
 186
 187         // Here we grab a section of the bigger pixmap, so that the background
 188         // *looks* like it's scrolling...
 189         QPixmap pm = gridBackground.copy(x, y, BG_BRUSH_SPAN, BG_BRUSH_SPAN);
 190         QPalette pal = palette();
 191         pal.setBrush(backgroundRole(), QBrush(pm));
 192         setAutoFillBackground(true);
 193         setPalette(pal);
 194 #endif
 195 }
 196
 197 void DrawingView::AddNewObjectToDocument(Object * object)
 198 {
 199         if (object)
 200         {
 201                 object->Reparent(&document);
 202                 document.Add(object);
 203                 update();
 204         }
 205 //printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
 206 }
 207
 208 QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
 209 {
 210         // This is undoing the transform, e.g. going from client coords to local coords.
 211         // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
 212         // conversion of the y-axis from increasing bottom to top.
 213         return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
 214 }
 215
 216 QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
 217 {
 218         // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
 219         // No voodoo here, it's just grouped wrong to see it. It should be:
 220         // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
 221         return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
 222 }
 223
 224 void DrawingView::paintEvent(QPaintEvent * /*event*/)
 225 {
 226         QPainter qtPainter(this);
 227         Painter painter(&qtPainter);
 228
 229 //      qtPainter.setBackground(QBrush(Qt::DiagCrossPattern));
 230 //      qtPainter.setBackgroundMode(Qt::OpaqueMode);
 231
 232         if (useAntialiasing)
 233                 qtPainter.setRenderHint(QPainter::Antialiasing);
 234
 235         Painter::screenSize = Vector(size().width(), size().height());
 236         Object::SetViewportHeight(size().height());
 237
 238         // Draw coordinate axes
 239
 240         painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
 241         painter.DrawLine(0, -16384, 0, 16384);
 242         painter.DrawLine(-16384, 0, 16384, 0);
 243
 244         // Draw supplemental (tool related) points
 245
 246         if (rotateTool)
 247         {
 248                 painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
 249                 painter.DrawLine(rx - 10, ry, rx + 10, ry);
 250                 painter.DrawLine(rx, ry - 10, rx, ry + 10);
 251         }
 252
 253 // Maybe we can make the grid into a background brush instead, and let Qt deal
 254 // with it???
 255         // Draw grid
 256
 257 #if 0
 258         painter.setPen(QPen(QColor(90, 90, 90), 1.0, Qt::DotLine));
 259
 260         //these two loops kill performance!
 261         // Also, these overwrite our coordinate axes
 262         for(double x=0; x<size().width(); x+=gridSpacing*10.0)
 263                 painter.drawLine((int)x, -16384, (int)x, 16384);
 264
 265         for(double y=0; y<size().height(); y+=gridSpacing*10.0)
 266                 painter.drawLine(-16384, (int)y, 16384, (int)y);
 267 #endif
 268
 269 //      painter.SetPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 270 //
 271 //      for(double x=0; x<size().width(); x+=gridSpacing)
 272 //              for(double y=0; y<size().height(); y+=gridSpacing)
 273 //                      painter.DrawPoint((int)x, (int)y);
 274
 275         // The top level document takes care of rendering for us...
 276         document.Draw(&painter);
 277
 278         if (toolAction)
 279                 toolAction->Draw(&painter);
 280 }
 281
 282 void DrawingView::mousePressEvent(QMouseEvent * event)
 283 {
 284         if (event->button() == Qt::LeftButton)
 285         {
 286                 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 287                 collided = document.Collided(point);
 288
 289                 if (collided)
 290                         update();       // Do an update if collided with at least *one* object in the document
 291
 292                 if (toolAction)
 293                         toolAction->MouseDown(point);
 294         }
 295         else if (event->button() == Qt::MiddleButton)
 296         {
 297                 scrollDrag = true;
 298                 oldPoint = Vector(event->x(), event->y());
 299                 // Should also change the mouse pointer as well...
 300                 setCursor(Qt::SizeAllCursor);
 301         }
 302 }
 303
 304 void DrawingView::mouseMoveEvent(QMouseEvent * event)
 305 {
 306         Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
 307
 308         if (event->buttons() & Qt::MiddleButton)
 309         {
 310                 point = Vector(event->x(), event->y());
 311                 // Since we're using Qt coords for scrolling, we have to adjust them here to
 312                 // conform to Cartesian coords, since the origin is using Cartesian. :-)
 313                 Vector delta(point, oldPoint);
 314                 delta /= Painter::zoom;
 315                 delta.y = -delta.y;
 316                 Painter::origin -= delta;
 317
 318                 UpdateGridBackground();
 319                 update();
 320                 oldPoint = point;
 321                 return;
 322         }
 323
 324         // Grid processing...
 325 #if 1
 326         // This looks strange, but it's really quite simple: We want a point that's
 327         // more than half-way to the next grid point to snap there while conversely
 328         // we want a point that's less than half-way to to the next grid point then
 329         // snap to the one before it. So we add half of the grid spacing to the
 330         // point, then divide by it so that we can remove the fractional part, then
 331         // multiply it back to get back to the correct answer.
 332         if (event->buttons() & Qt::LeftButton)
 333         {
 334                 point += gridSpacing / 2.0;                                     // *This* adds to Z!!!
 335                 point /= gridSpacing;
 336 //200% is ok, gridSpacing = 6 in this case...
 337 //won't run into problems until gridSpacing = 1.5 (zoom = 800%)
 338 //run into problems with this approach: when zoom level is 200% this truncates to
 339 //integers, which is *not* what's wanted here...
 340                 point.x = floor(point.x);//need to fix this for negative numbers...
 341                 point.y = floor(point.y);
 342                 point.z = 0;                                                            // Make *sure* Z doesn't go anywhere!!!
 343                 point *= gridSpacing;
 344         }
 345 #endif
 346 //we should keep track of the last point here and only pass this down *if* the point
 347 //changed...
 348         document.PointerMoved(point);
 349
 350         if (document.NeedsUpdate())
 351                 update();
 352
 353         if (toolAction)
 354         {
 355                 toolAction->MouseMoved(point);
 356                 update();
 357         }
 358 }
 359
 360 void DrawingView::mouseReleaseEvent(QMouseEvent * event)
 361 {
 362         if (event->button() == Qt::LeftButton)
 363         {
 364                 document.PointerReleased();
 365
 366 //We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
 367 //could set it up to use the document's update function (assumes that all object updates
 368 //are being reported correctly:
 369 //              if (document.NeedsUpdate())
 370 //              if (collided)
 371                         update();       // Do an update if collided with at least *one* object in the document
 372
 373                 if (toolAction)
 374                         toolAction->MouseReleased();
 375         }
 376         else if (event->button() == Qt::MiddleButton)
 377         {
 378                 scrollDrag = false;
 379                 setCursor(Qt::ArrowCursor);
 380         }
 381 }