Shamusworld >> Repos - ttedit/blob - src/editwindow.cpp

   1 //
   2 // TTEDIT.CPP - The TrueType Editor
   3 // by James L. Hammons
   4 // (C) 2004 Underground Software
   5 //
   6 // JLH = James L. Hammons <jlhamm@acm.org>
   7 //
   8 // Who  When        What
   9 // ---  ----------  -------------------------------------------------------------
  10 // JLH  08/28/2008  Created this file
  11 // JLH  09/02/2008  Separated scrolling from dedicated tool to MMB drag
  12 // JLH  03/13/2009  Converted from wxWidgets to Qt
  13 //
  14
  15 // FIXED:
  16 //
  17 // - Fixed scrolling
  18 //
  19 // STILL TO BE DONE:
  20 //
  21 // - Fix bug in Glyphpoints when dragging on an empty canvas or loading a font
  22 // - Fix zooming, settings (ini)
  23 // - Fix point adding bug 1: should be able to add points to empty canvas
  24 // - Fix point adding bug 2: should be able to add point successfully to single
  25 //   point on screen
  26 // - Add poly multi-select
  27 // - Add point multi-select
  28 // - Undo system
  29 //
  30
  31 // Uncomment this for debugging...
  32 #define DEBUG
  33 #define DEBUGFOO            // Various tool debugging...
  34 #define DEBUGTP                         // Toolpalette debugging...
  35
  36 #include "editwindow.h"
  37 #include "charwindow.h"
  38 #include "debug.h"
  39 #include "graphicprimitives.h"
  40 #include "mainwindow.h"
  41 #include "ttedit.h"
  42 #include "vector.h"
  43
  44
  45 EditWindow::EditWindow(QWidget * parent/*= NULL*/): QWidget(parent),
  46         scale(1.0), offsetX(-10), offsetY(-10), tool(TOOLSelect),
  47         ptHighlight(-1), oldPtHighlight(-1), ptNextHighlight(-1), oldPtNextHighlight(-1),
  48         polyFirstPoint(true), showRotationCenter(false), haveZeroPoint(false)
  49 {
  50         setBackgroundRole(QPalette::Base);
  51         setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  52
  53         toolPalette = new ToolWindow();
  54         CreateCursors();
  55         setCursor(cur[TOOLSelect]);
  56         setMouseTracking(true);
  57 }
  58
  59
  60 QSize EditWindow::minimumSizeHint() const
  61 {
  62         return QSize(50, 50);
  63 }
  64
  65
  66 QSize EditWindow::sizeHint() const
  67 {
  68         return QSize(400, 400);
  69 }
  70
  71
  72 void EditWindow::CreateCursors(void)
  73 {
  74         int hotx[10] = {  1,  1, 11, 15,  1,  1,  1,  1,  1,  1 };
  75         int hoty[10] = {  1,  1, 11, 13,  1,  1,  1,  1,  1,  1 };
  76         char cursorName[10][48] = { "select", "select-poly", "scroll", "zoom", "add-point",
  77                 "add-poly", "del-point", "del-poly", "rotate", "rotate" };
  78
  79         for(int i=0; i<10; i++)
  80         {
  81                 QString s;
  82                 s.sprintf(":/res/cursor-%s.png", cursorName[i]);
  83                 QPixmap pmTmp(s);
  84                 cur[i] = QCursor(pmTmp, hotx[i], hoty[i]);
  85         }
  86 }
  87
  88
  89 QPoint EditWindow::GetAdjustedMousePosition(QMouseEvent * event)
  90 {
  91         QSize winSize = size();
  92         // This is undoing the transform, e.g. going from client coords to local coords.
  93         // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
  94         // conversion of the y-axis from increasing bottom to top.
  95         return QPoint(offsetX + event->x(), offsetY + (winSize.height() - event->y()));
  96 }
  97
  98
  99 QPoint EditWindow::GetAdjustedClientPosition(int x, int y)
 100 {
 101         QSize winSize = size();
 102
 103         // VOODOO ALERT (ON Y COMPONENT!!!!)
 104         return QPoint(-offsetX + x, (winSize.height() - (-offsetY + y)) * +1.0);
 105 }
 106
 107
 108 /*
 109 TODO:
 110  o  Different colors for polys on selected points
 111  o  Different colors for handles on non-selected polys
 112  o  Line of sight (dashed, dotted) for off-curve points
 113  o  Repaints for press/release of CTRL/SHIFT during point creation
 114 */
 115 void EditWindow::paintEvent(QPaintEvent * /*event*/)
 116 {
 117         QPainter p(this);
 118 //hm, causes lockup (or does it???)
 119         p.setRenderHint(QPainter::Antialiasing);
 120 //Doesn't do crap!
 121 //dc.SetBackground(*wxWHITE_BRUSH);
 122
 123 // Due to the screwiness of wxWidgets coord system, the origin is ALWAYS
 124 // the upper left corner--regardless of axis orientation, etc...
 125 //      int width, height;
 126 //      dc.GetSize(&width, &height);
 127         QSize winSize = size();
 128
 129 //      dc.SetDeviceOrigin(-offsetX, height - (-offsetY));
 130 //      dc.SetAxisOrientation(true, true);
 131         p.translate(QPoint(-offsetX, winSize.height() - (-offsetY)));
 132         p.scale(1.0, -1.0);
 133
 134 // Scrolling can be done by using OffsetViewportOrgEx
 135 // Scaling can be done by adjusting SetWindowExtEx (it's denominator of txform)
 136 // you'd use: % = ViewportExt / WindowExt
 137 // But it makes the window look like crap: fuggetuboutit.
 138 // Instead, we have to scale EVERYTHING by hand. Crap!
 139 // It's not *that* bad, but not as convenient either...
 140
 141 //      dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0x00, 0x00, 0xFF), 1, wxDOT)));
 142 ////    dc.DrawLine(0, 0, 10, 10);
 143         p.setPen(QPen(Qt::blue, 1.0, Qt::DotLine));
 144
 145         // Draw coordinate axes
 146
 147 //      dc.CrossHair(0, 0);
 148         p.drawLine(0, -16384, 0, 16384);
 149         p.drawLine(-16384, 0, 16384, 0);
 150
 151         // Draw rotation center (if active)
 152
 153         if (showRotationCenter)
 154         {
 155                 p.setPen(QPen(Qt::red, 2.0, Qt::SolidLine));
 156                 p.drawLine(rotationCenter.x() + 7, rotationCenter.y(), rotationCenter.x() - 7, rotationCenter.y());
 157                 p.drawLine(rotationCenter.x(), rotationCenter.y() + 7, rotationCenter.x(), rotationCenter.y() - 7);
 158         }
 159
 160         // Draw points
 161
 162         for(int i=0; i<pts.GetNumPoints(); i++)
 163         {
 164                 if (i == ptHighlight)
 165                 {
 166 //                      dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0xFF, 0x00, 0x00), 1, wxSOLID)));
 167 ////                    SelectObject(hdc, hRedPen1);
 168                         p.setPen(QPen(Qt::red, 1.0, Qt::SolidLine));
 169
 170                         if (pts.GetOnCurve(i))
 171                         {
 172                                 DrawSquareDotN(p, pts.GetX(i), pts.GetY(i), 7);
 173                                 DrawSquareDotN(p, pts.GetX(i), pts.GetY(i), 9);
 174                         }
 175                         else
 176                         {
 177                                 DrawRoundDotN(p, pts.GetX(i), pts.GetY(i), 7);
 178                                 DrawRoundDotN(p, pts.GetX(i), pts.GetY(i), 9);
 179                         }
 180                 }
 181                 else if ((i == ptHighlight || i == ptNextHighlight) && tool == TOOLAddPt)
 182                 {
 183 //                      dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0x00, 0xAF, 0x00), 1, wxSOLID)));
 184 ////                    SelectObject(hdc, hGreenPen1);
 185                         p.setPen(QPen(Qt::green, 1.0, Qt::SolidLine));
 186
 187                         if (pts.GetOnCurve(i))
 188                         {
 189                                 DrawSquareDotN(p, pts.GetX(i), pts.GetY(i), 7);
 190                                 DrawSquareDotN(p, pts.GetX(i), pts.GetY(i), 9);
 191                         }
 192                         else
 193                         {
 194                                 DrawRoundDotN(p, pts.GetX(i), pts.GetY(i), 7);
 195                                 DrawRoundDotN(p, pts.GetX(i), pts.GetY(i), 9);
 196                         }
 197                 }
 198                 else
 199                 {
 200 //                      dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0x00, 0x00, 0x00), 1, wxSOLID)));
 201 ////                    SelectObject(hdc, hBlackPen1);
 202                         p.setPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 203
 204                         if (pts.GetOnCurve(i))
 205                                 DrawSquareDot(p, pts.GetX(i), pts.GetY(i));
 206                         else
 207                                 DrawRoundDot(p, pts.GetX(i), pts.GetY(i));
 208                 }
 209
 210                 if (tool == TOOLDelPt && i == ptHighlight)
 211                 {
 212 #if 0
 213                         dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0xFF, 0x00, 0x00), 1, wxSOLID)));
 214 //                      SelectObject(hdc, hRedPen1);
 215 //                      MoveToEx(hdc, pts.GetX(i) - 5, pts.GetY(i) - 5, NULL);
 216 //                      LineTo(hdc, pts.GetX(i) + 5, pts.GetY(i) + 5);
 217 //                      LineTo(hdc, pts.GetX(i) - 5, pts.GetY(i) - 5);//Lameness!
 218 //                      MoveToEx(hdc, pts.GetX(i) - 5, pts.GetY(i) + 5, NULL);
 219 //                      LineTo(hdc, pts.GetX(i) + 5, pts.GetY(i) - 5);
 220 //                      LineTo(hdc, pts.GetX(i) - 5, pts.GetY(i) + 5);//More lameness!!
 221 #endif
 222                         p.setPen(QPen(Qt::red, 1.0, Qt::SolidLine));
 223                         p.drawLine(pts.GetX(i) - 5, pts.GetY(i) - 5, pts.GetX(i) + 5, pts.GetY(i) + 5);
 224                         p.drawLine(pts.GetX(i) + 5, pts.GetY(i) - 5, pts.GetX(i) - 5, pts.GetY(i) + 5);
 225                 }
 226         }
 227
 228 ////            SelectObject(hdc, hBlackPen1);
 229 //      dc.SetPen(*(wxThePenList->FindOrCreatePen(wxColour(0x00, 0x00, 0x00), 1, wxSOLID)));
 230         p.setPen(QPen(Qt::black, 1.0, Qt::SolidLine));
 231
 232         // Draw curve formed by points
 233
 234         for(int poly=0; poly<pts.GetNumPolys(); poly++)
 235         {
 236                 if (pts.GetNumPoints(poly) > 2)
 237                 {
 238                         // Initial move...
 239                         // If it's not on curve, then move to it, otherwise move to last point...
 240
 241                         int x, y;
 242
 243                         if (pts.GetOnCurve(poly, pts.GetNumPoints(poly) - 1))
 244                                 x = (int)pts.GetX(poly, pts.GetNumPoints(poly) - 1), y = (int)pts.GetY(poly, pts.GetNumPoints(poly) - 1);
 245                         else
 246                                 x = (int)pts.GetX(poly, 0), y = (int)pts.GetY(poly, 0);
 247
 248                         for(int i=0; i<pts.GetNumPoints(poly); i++)
 249                         {
 250                                 if (pts.GetOnCurve(poly, i))
 251 //                                      LineTo(hdc, pts.GetX(poly, i), pts.GetY(poly, i));
 252                                 {
 253                                         p.drawLine(x, y, pts.GetX(poly, i), pts.GetY(poly, i));
 254                                         x = (int)pts.GetX(poly, i), y = (int)pts.GetY(poly, i);
 255                                 }
 256                                 else
 257                                 {
 258                                         uint32 prev = pts.GetPrev(poly, i), next = pts.GetNext(poly, i);
 259                                         float px = pts.GetX(poly, prev), py = pts.GetY(poly, prev),
 260                                                 nx = pts.GetX(poly, next), ny = pts.GetY(poly, next);
 261
 262                                         if (!pts.GetOnCurve(poly, prev))
 263                                                 px = (px + pts.GetX(poly, i)) / 2.0f,
 264                                                 py = (py + pts.GetY(poly, i)) / 2.0f;
 265
 266                                         if (!pts.GetOnCurve(poly, next))
 267                                                 nx = (nx + pts.GetX(poly, i)) / 2.0f,
 268                                                 ny = (ny + pts.GetY(poly, i)) / 2.0f;
 269
 270                                         Bezier(p, point(px, py), point(pts.GetX(poly, i), pts.GetY(poly, i)), point(nx, ny));
 271                                         x = (int)nx, y = (int)ny;
 272
 273                                         if (pts.GetOnCurve(poly, next))
 274                                                 i++;                                    // Following point is on curve, so move past it
 275                                 }
 276                         }
 277                 }
 278         }
 279
 280         if (haveZeroPoint)
 281         {
 282                 // Rotation code
 283                 GlyphPoints rotated = pts;
 284                 rotated.RotatePoints(rotationAngle, IPoint(rotationCenter.x(), rotationCenter.y()));
 285                 p.setPen(QPen(QColor(255, 0, 255), 1.0, Qt::SolidLine));
 286 #if 0
 287                 for(int poly=0; poly<rotated.GetNumPolys(); poly++)
 288                 {
 289                         if (rotated.GetNumPoints(poly) > 2)
 290                         {
 291                                 // Initial move...
 292                                 // If it's not on curve, then move to it, otherwise move to last point...
 293
 294                                 int x, y;
 295
 296                                 if (rotated.GetOnCurve(poly, rotated.GetNumPoints(poly) - 1))
 297                                         x = (int)rotated.GetX(poly, rotated.GetNumPoints(poly) - 1), y = (int)rotated.GetY(poly, rotated.GetNumPoints(poly) - 1);
 298                                 else
 299                                         x = (int)rotated.GetX(poly, 0), y = (int)rotated.GetY(poly, 0);
 300
 301                                 for(int i=0; i<rotated.GetNumPoints(poly); i++)
 302                                 {
 303                                         if (rotated.GetOnCurve(poly, i))
 304         //                                      LineTo(hdc, rotated.GetX(poly, i), rotated.GetY(poly, i));
 305                                         {
 306                                                 p.drawLine(x, y, rotated.GetX(poly, i), rotated.GetY(poly, i));
 307                                                 x = (int)rotated.GetX(poly, i), y = (int)rotated.GetY(poly, i);
 308                                         }
 309                                         else
 310                                         {
 311                                                 uint32 prev = rotated.GetPrev(poly, i), next = rotated.GetNext(poly, i);
 312                                                 float px = rotated.GetX(poly, prev), py = rotated.GetY(poly, prev),
 313                                                         nx = rotated.GetX(poly, next), ny = rotated.GetY(poly, next);
 314
 315                                                 if (!rotated.GetOnCurve(poly, prev))
 316                                                         px = (px + rotated.GetX(poly, i)) / 2.0f,
 317                                                         py = (py + rotated.GetY(poly, i)) / 2.0f;
 318
 319                                                 if (!rotated.GetOnCurve(poly, next))
 320                                                         nx = (nx + rotated.GetX(poly, i)) / 2.0f,
 321                                                         ny = (ny + rotated.GetY(poly, i)) / 2.0f;
 322
 323                                                 Bezier(p, point(px, py), point(rotated.GetX(poly, i), rotated.GetY(poly, i)), point(nx, ny));
 324                                                 x = (int)nx, y = (int)ny;
 325
 326                                                 if (rotated.GetOnCurve(poly, next))
 327                                                         i++;                                    // Following point is on curve, so move past it
 328                                         }
 329                                 }
 330                         }
 331                 }
 332 #else
 333                 DrawGlyph(p, rotated);
 334 #endif
 335         }
 336 }
 337
 338
 339 void EditWindow::DrawGlyph(QPainter & p, GlyphPoints & glyph)
 340 {
 341         for(int poly=0; poly<glyph.GetNumPolys(); poly++)
 342         {
 343                 if (glyph.GetNumPoints(poly) > 2)
 344                 {
 345                         // Initial move...
 346                         // If it's not on curve, then move to it, otherwise move to last point...
 347
 348                         int x, y;
 349
 350                         if (glyph.GetOnCurve(poly, glyph.GetNumPoints(poly) - 1))
 351                                 x = (int)glyph.GetX(poly, glyph.GetNumPoints(poly) - 1), y = (int)glyph.GetY(poly, glyph.GetNumPoints(poly) - 1);
 352                         else
 353                                 x = (int)glyph.GetX(poly, 0), y = (int)glyph.GetY(poly, 0);
 354
 355                         for(int i=0; i<glyph.GetNumPoints(poly); i++)
 356                         {
 357                                 if (glyph.GetOnCurve(poly, i))
 358                                 {
 359                                         p.drawLine(x, y, glyph.GetX(poly, i), glyph.GetY(poly, i));
 360                                         x = (int)glyph.GetX(poly, i), y = (int)glyph.GetY(poly, i);
 361                                 }
 362                                 else
 363                                 {
 364                                         uint32 prev = glyph.GetPrev(poly, i), next = glyph.GetNext(poly, i);
 365                                         float px = glyph.GetX(poly, prev), py = glyph.GetY(poly, prev),
 366                                                 nx = glyph.GetX(poly, next), ny = glyph.GetY(poly, next);
 367
 368                                         if (!glyph.GetOnCurve(poly, prev))
 369                                                 px = (px + glyph.GetX(poly, i)) / 2.0f,
 370                                                 py = (py + glyph.GetY(poly, i)) / 2.0f;
 371
 372                                         if (!glyph.GetOnCurve(poly, next))
 373                                                 nx = (nx + glyph.GetX(poly, i)) / 2.0f,
 374                                                 ny = (ny + glyph.GetY(poly, i)) / 2.0f;
 375
 376                                         Bezier(p, point(px, py), point(glyph.GetX(poly, i), glyph.GetY(poly, i)), point(nx, ny));
 377                                         x = (int)nx, y = (int)ny;
 378
 379                                         if (glyph.GetOnCurve(poly, next))
 380                                                 i++;                                    // Following point is on curve, so move past it
 381                                 }
 382                         }
 383                 }
 384         }
 385 }
 386
 387
 388 void EditWindow::mousePressEvent(QMouseEvent * event)
 389 {
 390         if (event->button() == Qt::RightButton)
 391         {
 392                 toolPalette->move(event->globalPos());
 393                 toolPalette->setVisible(true);
 394                 setCursor(cur[TOOLSelect]);
 395                 toolPalette->prevTool = TOOLSelect;
 396         }
 397         else if (event->button() == Qt::MidButton)
 398         {
 399                 setCursor(cur[2]);                                                      // Scrolling cursor
 400         }
 401         else if (event->button() == Qt::LeftButton)
 402         {
 403                 if (tool == TOOLScroll || tool == TOOLZoom)
 404 ;//meh                  CaptureMouse();                                         // Make sure we capture the mouse when in scroll/zoom mode
 405                 else if (tool == TOOLAddPt)             // "Add Point" tool
 406                 {
 407                         if (pts.GetNumPoints() > 0)
 408                         {
 409                                 QPoint pt = GetAdjustedMousePosition(event);
 410                                 pts.InsertPoint(pts.GetNext(ptHighlight), pt.x(), pt.y(), ((event->modifiers() == Qt::ShiftModifier || event->modifiers() == Qt::ControlModifier) ? false : true));
 411                                 ptHighlight = ptNextHighlight;
 412                                 update();
 413                         }
 414                 }
 415                 else if (tool == TOOLAddPoly)   // "Add Poly" tool
 416                 {
 417 #ifdef DEBUGFOO
 418 WriteLogMsg("Adding point... # polys: %u, # points: %u", pts.GetNumPolys(), pts.GetNumPoints());
 419 #endif
 420                         if (polyFirstPoint)
 421                         {
 422                                 polyFirstPoint = false;
 423                                 pts.AddNewPolyAtEnd();
 424                         }
 425
 426                         QPoint pt = GetAdjustedMousePosition(event);
 427 //printf("GetAdjustedMousePosition = %i, %i\n", pt.x(), pt.y());
 428                         // Append a point to the end of the structure
 429                         pts += IPoint(pt.x(), pt.y(), ((event->modifiers() == Qt::ShiftModifier || event->modifiers() == Qt::ControlModifier) ? false : true));
 430                         ptHighlight = pts.GetNumPoints() - 1;
 431                         update();
 432 #ifdef DEBUGFOO
 433 WriteLogMsg(" --> [# polys: %u, # points: %u]\n", pts.GetNumPolys(), pts.GetNumPoints());
 434 #endif
 435                 }
 436                 else if (tool == TOOLSelect || tool == TOOLPolySelect)
 437                 {
 438                         if (pts.GetNumPoints() > 0)
 439                         {
 440                                 pt = GetAdjustedClientPosition(pts.GetX(ptHighlight), pts.GetY(ptHighlight));
 441 //printf("GetAdjustedClientPosition = %i, %i\n", pt.x(), pt.y());
 442 //                              WarpPointer(pt.x, pt.y);
 443                                 QCursor::setPos(mapToGlobal(pt));
 444
 445                                 if (event->modifiers() == Qt::ShiftModifier || event->modifiers() == Qt::ControlModifier)
 446                                 {
 447                                         pts.SetOnCurve(ptHighlight, !pts.GetOnCurve(ptHighlight));
 448                                         update();
 449                                 }
 450                         }
 451                 }
 452                 else if (tool == TOOLDelPt)
 453                 {
 454                         if (pts.GetNumPoints() > 0)
 455 //Or could use:
 456 //                      if (ptHighlight != -1)
 457                         {
 458 //This assumes that WM_MOUSEMOVE happens before this!
 459 //The above commented out line should take care of this contingency... !!! FIX !!!
 460                                 pts.DeletePoint(ptHighlight);
 461                                 update();
 462                         }
 463                 }
 464                 else if (tool == TOOLRotate)
 465                 {
 466                         // I think what's needed here is to keep the initial mouse click,
 467                         // paint the rotation center, then use the 1st mouse move event to establish
 468                         // the rotation "zero line", which becomes the line of reference to all
 469                         // subsequent mouse moves.
 470                         rotationCenter = GetAdjustedMousePosition(event);
 471                         showRotationCenter = true;
 472                         haveZeroPoint = false;
 473                         rotationAngle = 0;
 474                         update();
 475                 }
 476         }
 477
 478         event->accept();
 479 }
 480
 481
 482 void EditWindow::mouseMoveEvent(QMouseEvent * event)
 483 {
 484         if (event->buttons() == Qt::RightButton)
 485         {
 486                 ToolType newTool = toolPalette->FindSelectedTool();
 487
 488                 if (newTool != toolPalette->prevTool)
 489                 {
 490                         toolPalette->prevTool = newTool;
 491                         toolPalette->repaint();
 492                 }
 493         }
 494         else if (event->buttons() == Qt::MidButton)
 495         {
 496                 // Calc offset from previous point
 497                 pt = event->pos();
 498                 ptOffset = QPoint(pt.x() - ptPrevious.x(), pt.y() - ptPrevious.y());
 499
 500 // Then multiply it by the scaling factor. Whee!
 501                 // This looks wacky because we're using screen coords for the offset...
 502                 // Otherwise, we would subtract both offsets!
 503                 offsetX -= ptOffset.x(), offsetY += ptOffset.y();
 504                 update();
 505                 ptPrevious = pt;
 506         }
 507         else if (event->buttons() == Qt::LeftButton)
 508         {
 509                 if (tool == TOOLAddPt || tool == TOOLAddPoly || tool == TOOLSelect)
 510                 {
 511                         if (tool != TOOLAddPt || pts.GetNumPoints() > 0)//yecch.
 512                         {
 513 //temporary, for testing. BTW, Select drag bug is here...!
 514 #if 1
 515                                 QPoint pt2 = GetAdjustedMousePosition(event);
 516                                 pts.SetXY(ptHighlight, pt2.x(), pt2.y());
 517                                 update();
 518 #endif
 519                         }
 520                 }
 521                 else if (tool == TOOLPolySelect)
 522                 {
 523                         if (pts.GetNumPoints() > 0)
 524                         {
 525                                 QPoint pt2 = GetAdjustedMousePosition(event);
 526                                 // Should also set onCurve here as well, depending on keystate
 527 //Or should we?
 528                                 pts.OffsetPoly(pts.GetPoly(ptHighlight), pt2.x() - pts.GetX(ptHighlight), pt2.y() - pts.GetY(ptHighlight));
 529                                 update();
 530                         }
 531                 }
 532                 else if (tool == TOOLRotate)
 533                 {
 534                         if (pts.GetNumPoints() > 0)
 535                         {
 536                                 if (!haveZeroPoint)
 537                                 {
 538                                         rotationZeroPoint = GetAdjustedMousePosition(event);
 539                                         haveZeroPoint = true;
 540                                 }
 541                                 else
 542                                 {
 543                                         // Figure out the angle between the "zero" vector and the current one,
 544                                         // then rotate all points relative to the "zero" vector (done by paint())
 545                                         QPoint currentPoint = GetAdjustedMousePosition(event);
 546                                         Vector v1(rotationZeroPoint.x(), rotationZeroPoint.y(), 0,
 547                                                 rotationCenter.x(), rotationCenter.y(), 0);
 548                                         Vector v2(currentPoint.x(), currentPoint.y(), 0,
 549                                                 rotationCenter.x(), rotationCenter.y(), 0);
 550 //                                      rotationAngle = v1.Angle(v2);
 551                                         rotationAngle = v2.Angle(v1);
 552
 553                                         QString s;
 554                                         s.sprintf("%.3f degrees", rotationAngle * 180.0 / 3.14159265358979323);
 555                                         ((TTEdit *)qApp)->mainWindow->statusBar()->showMessage(s);
 556                                 }
 557
 558                                 update();
 559                         }
 560                 }
 561         }
 562         else if (event->buttons() == Qt::NoButton)
 563         {
 564                 // Moving, not dragging...
 565                 if (tool == TOOLSelect || tool == TOOLDelPt || tool == TOOLAddPt
 566                         || tool == TOOLPolySelect)// || tool == TOOLAddPoly)
 567                 {
 568                         QPoint pt2 = GetAdjustedMousePosition(event);
 569                         double closest = 1.0e+99;
 570
 571                         for(int i=0; i<pts.GetNumPoints(); i++)
 572                         {
 573                                 double dist = ((pt2.x() - pts.GetX(i)) * (pt2.x() - pts.GetX(i)))
 574                                         + ((pt2.y() - pts.GetY(i)) * (pt2.y() - pts.GetY(i)));
 575
 576                                 if (dist < closest)
 577                                         closest = dist, ptHighlight = i;
 578                         }
 579
 580                         if (ptHighlight != oldPtHighlight)
 581                         {
 582                                 oldPtHighlight = ptHighlight;
 583                                 update();
 584                         }
 585
 586                         // What follows here looks like voodoo, but is really simple. What we do is
 587                         // check to see if the mouse point has a perpendicular intersection with any of
 588                         // the line segments. If it does, calculate the length of the perpendicular
 589                         // and choose the smallest length. If there is no perpendicular, then choose the
 590                         // length of line connecting the closer of either the first endpoint or the
 591                         // second and choose the smallest of those.
 592
 593                         // There is one bit of math that looks like voodoo to me ATM--will explain once
 594                         // I understand it better (the calculation of the length of the perpendicular).
 595
 596                         if (pts.GetNumPoints() > 1 && tool == TOOLAddPt)
 597                         {
 598                                 double smallest = 1.0e+99;
 599
 600                                 for(int i=0; i<pts.GetNumPoints(); i++)
 601                                 {
 602                                         int32 p1x = pts.GetX(i), p1y = pts.GetY(i),
 603                                                 p2x = pts.GetX(pts.GetNext(i)), p2y = pts.GetY(pts.GetNext(i));
 604
 605                                         Vector ls(p2x, p2y, 0, p1x, p1y, 0), v1(pt2.x(), pt2.y(), 0, p1x, p1y, 0),
 606                                                 v2(pt2.x(), pt2.y(), 0, p2x, p2y, 0);
 607                                         double pp = ls.Dot(v1) / ls.Magnitude(), dist;
 608 // Geometric interpretation:
 609 // pp is the paremeterized point on the vector ls where the perpendicular intersects ls.
 610 // If pp < 0, then the perpendicular lies beyond the 1st endpoint. If pp > length of ls,
 611 // then the perpendicular lies beyond the 2nd endpoint.
 612
 613                                         if (pp < 0.0)
 614                                                 dist = v1.Magnitude();
 615                                         else if (pp > ls.Magnitude())
 616                                                 dist = v2.Magnitude();
 617                                         else                                    // distance = ?Det?(ls, v1) / |ls|
 618                                                 dist = fabs((ls.x * v1.y - v1.x * ls.y) / ls.Magnitude());
 619
 620 //The answer to the above looks like it might be found here:
 621 //
 622 //If the segment endpoints are s and e, and the point is p, then the test for the perpendicular
 623 //intercepting the segment is equivalent to insisting that the two dot products {s-e}.{s-p} and
 624 //{e-s}.{e-p} are both non-negative.  Perpendicular distance from the point to the segment is
 625 //computed by first computing the area of the triangle the three points form, then dividing by the
 626 //length of the segment.  Distances are done just by the Pythagorean theorem.  Twice the area of the
 627 //triangle formed by three points is the determinant of the following matrix:
 628 //
 629 //sx sy 1
 630 //ex ey 1
 631 //px py 1
 632 //
 633 //By translating the start point to the origin, this can be rewritten as:
 634 //By subtracting row 1 from all rows, you get the following:
 635 //[because sx = sy = 0. you could leave out the -sx/y terms below. because we subtracted
 636 // row 1 from all rows (including row 1) row 1 turns out to be zero. duh!]
 637 //
 638 //0         0         0
 639 //(ex - sx) (ey - sy) 0
 640 //(px - sx) (py - sy) 0
 641 //
 642 //which greatly simplifies the calculation of the determinant.
 643
 644                                         if (dist < smallest)
 645                                                 smallest = dist, ptNextHighlight = pts.GetNext(i), ptHighlight = i;
 646                                 }
 647
 648                                 if (ptNextHighlight != oldPtNextHighlight)
 649                                 {
 650                                         oldPtNextHighlight = ptNextHighlight;
 651                                         update();
 652                                 }
 653                         }
 654                 }
 655
 656                 ptPrevious = event->pos();
 657         }
 658
 659         event->accept();
 660 }
 661
 662
 663 void EditWindow::mouseReleaseEvent(QMouseEvent * event)
 664 {
 665         if (event->button() == Qt::RightButton)
 666         {
 667                 ToolType newTool = toolPalette->FindSelectedTool();
 668
 669                 // We only change the tool if a new one was actually selected. Otherwise, we do nothing.
 670                 if (newTool != TOOLNone)
 671                 {
 672                         tool = newTool;
 673
 674                         if (tool == TOOLScroll || tool == TOOLZoom || tool == TOOLAddPoly
 675                                 || tool == TOOLDelPoly)
 676                                 ptHighlight = -1;
 677
 678                         if (tool == TOOLAddPoly)
 679                                 polyFirstPoint = true;
 680                 }
 681
 682                 toolPalette->setVisible(false);
 683                 setCursor(cur[tool]);
 684                 // Just in case we changed highlighting style with the new tool...
 685                 update();
 686         }
 687         else if (event->button() == Qt::MidButton)
 688         {
 689                 setCursor(cur[tool]);                                           // Restore previous cursor
 690         }
 691         else if (event->button() == Qt::LeftButton)
 692         {
 693                 if (showRotationCenter)
 694                 {
 695                         showRotationCenter = false;
 696                         haveZeroPoint = false;
 697                         pts.RotatePoints(rotationAngle, IPoint(rotationCenter.x(), rotationCenter.y()));
 698                         update();
 699                         ((TTEdit *)qApp)->mainWindow->statusBar()->showMessage("");
 700                 }
 701
 702 //              if (tool == TOOLScroll || tool == TOOLZoom)
 703 //                      ReleaseMouse();
 704 //this is prolly too much
 705                 ((TTEdit *)qApp)->charWnd->MakePathFromPoints(&pts);
 706                 ((TTEdit *)qApp)->charWnd->update();
 707
 708         }
 709
 710         event->accept();
 711 }