demos/boxes/qtbox.cpp

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  41
  42 #include "qtbox.h"
  43
  44 const qreal ROTATE_SPEED_X = 30.0 / 1000.0;
  45 const qreal ROTATE_SPEED_Y = 20.0 / 1000.0;
  46 const qreal ROTATE_SPEED_Z = 40.0 / 1000.0;
  47 const int MAX_ITEM_SIZE = 512;
  48 const int MIN_ITEM_SIZE = 16;
  49
  50 //============================================================================//
  51 //                                  ItemBase                                  //
  52 //============================================================================//
  53
  54 ItemBase::ItemBase(int size, int x, int y) : m_size(size), m_isResizing(false)
  55 {
  56     setFlag(QGraphicsItem::ItemIsMovable, true);
  57     setFlag(QGraphicsItem::ItemIsSelectable, true);
  58     setFlag(QGraphicsItem::ItemIsFocusable, true);
  59     setAcceptHoverEvents(true);
  60     setPos(x, y);
  61     m_startTime = QTime::currentTime();
  62 }
  63
  64 ItemBase::~ItemBase()
  65 {
  66 }
  67
  68 QRectF ItemBase::boundingRect() const
  69 {
  70     return QRectF(-m_size / 2, -m_size / 2, m_size, m_size);
  71 }
  72
  73 void ItemBase::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
  74 {
  75     if (option->state & QStyle::State_Selected) {
  76         painter->setRenderHint(QPainter::Antialiasing, true);
  77         if (option->state & QStyle::State_HasFocus)
  78             painter->setPen(Qt::yellow);
  79         else
  80             painter->setPen(Qt::white);
  81         painter->drawRect(boundingRect());
  82
  83         painter->drawLine(m_size / 2 - 9, m_size / 2, m_size / 2, m_size / 2 - 9);
  84         painter->drawLine(m_size / 2 - 6, m_size / 2, m_size / 2, m_size / 2 - 6);
  85         painter->drawLine(m_size / 2 - 3, m_size / 2, m_size / 2, m_size / 2 - 3);
  86
  87         painter->setRenderHint(QPainter::Antialiasing, false);
  88     }
  89 }
  90
  91 void ItemBase::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
  92 {
  93     if (!isSelected() && scene()) {
  94         scene()->clearSelection();
  95         setSelected(true);
  96     }
  97
  98     QMenu menu;
  99     QAction *delAction = menu.addAction("Delete");
 100     QAction *newAction = menu.addAction("New");
 101     QAction *growAction = menu.addAction("Grow");
 102     QAction *shrinkAction = menu.addAction("Shrink");
 103
 104     QAction *selectedAction = menu.exec(event->screenPos());
 105
 106     if (selectedAction == delAction)
 107         deleteSelectedItems(scene());
 108     else if (selectedAction == newAction)
 109         duplicateSelectedItems(scene());
 110     else if (selectedAction == growAction)
 111         growSelectedItems(scene());
 112     else if (selectedAction == shrinkAction)
 113         shrinkSelectedItems(scene());
 114 }
 115
 116 void ItemBase::duplicateSelectedItems(QGraphicsScene *scene)
 117 {
 118     if (!scene)
 119         return;
 120
 121     QList<QGraphicsItem *> selected;
 122     selected = scene->selectedItems();
 123
 124     foreach (QGraphicsItem *item, selected) {
 125         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
 126         if (itemBase)
 127             scene->addItem(itemBase->createNew(itemBase->m_size, itemBase->pos().x() + itemBase->m_size, itemBase->pos().y()));
 128     }
 129 }
 130
 131 void ItemBase::deleteSelectedItems(QGraphicsScene *scene)
 132 {
 133     if (!scene)
 134         return;
 135
 136     QList<QGraphicsItem *> selected;
 137     selected = scene->selectedItems();
 138
 139     foreach (QGraphicsItem *item, selected) {
 140         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
 141         if (itemBase)
 142             delete itemBase;
 143     }
 144 }
 145
 146 void ItemBase::growSelectedItems(QGraphicsScene *scene)
 147 {
 148     if (!scene)
 149         return;
 150
 151     QList<QGraphicsItem *> selected;
 152     selected = scene->selectedItems();
 153
 154     foreach (QGraphicsItem *item, selected) {
 155         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
 156         if (itemBase) {
 157             itemBase->prepareGeometryChange();
 158             itemBase->m_size *= 2;
 159             if (itemBase->m_size > MAX_ITEM_SIZE)
 160                 itemBase->m_size = MAX_ITEM_SIZE;
 161         }
 162     }
 163 }
 164
 165 void ItemBase::shrinkSelectedItems(QGraphicsScene *scene)
 166 {
 167     if (!scene)
 168         return;
 169
 170     QList<QGraphicsItem *> selected;
 171     selected = scene->selectedItems();
 172
 173     foreach (QGraphicsItem *item, selected) {
 174         ItemBase *itemBase = qgraphicsitem_cast<ItemBase *>(item);
 175         if (itemBase) {
 176             itemBase->prepareGeometryChange();
 177             itemBase->m_size /= 2;
 178             if (itemBase->m_size < MIN_ITEM_SIZE)
 179                 itemBase->m_size = MIN_ITEM_SIZE;
 180         }
 181     }
 182 }
 183
 184 void ItemBase::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
 185 {
 186     if (m_isResizing) {
 187         int dx = int(2.0 * event->pos().x());
 188         int dy = int(2.0 * event->pos().y());
 189         prepareGeometryChange();
 190         m_size = (dx > dy ? dx : dy);
 191         if (m_size < MIN_ITEM_SIZE)
 192             m_size = MIN_ITEM_SIZE;
 193         else if (m_size > MAX_ITEM_SIZE)
 194             m_size = MAX_ITEM_SIZE;
 195     } else {
 196         QGraphicsItem::mouseMoveEvent(event);
 197     }
 198 }
 199
 200 void ItemBase::hoverMoveEvent(QGraphicsSceneHoverEvent *event)
 201 {
 202     if (m_isResizing || (isInResizeArea(event->pos()) && isSelected()))
 203         setCursor(Qt::SizeFDiagCursor);
 204     else
 205         setCursor(Qt::ArrowCursor);
 206     QGraphicsItem::hoverMoveEvent(event);
 207 }
 208
 209 void ItemBase::mousePressEvent(QGraphicsSceneMouseEvent *event)
 210 {
 211     static qreal z = 0.0;
 212     setZValue(z += 1.0);
 213     if (event->button() == Qt::LeftButton && isInResizeArea(event->pos())) {
 214         m_isResizing = true;
 215     } else {
 216         QGraphicsItem::mousePressEvent(event);
 217     }
 218 }
 219
 220 void ItemBase::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 221 {
 222     if (event->button() == Qt::LeftButton && m_isResizing) {
 223         m_isResizing = false;
 224     } else {
 225         QGraphicsItem::mouseReleaseEvent(event);
 226     }
 227 }
 228
 229 void ItemBase::keyPressEvent(QKeyEvent *event)
 230 {
 231     switch (event->key()) {
 232     case Qt::Key_Delete:
 233         deleteSelectedItems(scene());
 234         break;
 235     case Qt::Key_Insert:
 236         duplicateSelectedItems(scene());
 237         break;
 238     case Qt::Key_Plus:
 239         growSelectedItems(scene());
 240         break;
 241     case Qt::Key_Minus:
 242         shrinkSelectedItems(scene());
 243         break;
 244     default:
 245         QGraphicsItem::keyPressEvent(event);
 246         break;
 247     }
 248 }
 249
 250 void ItemBase::wheelEvent(QGraphicsSceneWheelEvent *event)
 251 {
 252     prepareGeometryChange();
 253     m_size = int(m_size * exp(-event->delta() / 600.0));
 254     if (m_size > MAX_ITEM_SIZE)
 255         m_size = MAX_ITEM_SIZE;
 256     else if (m_size < MIN_ITEM_SIZE)
 257         m_size = MIN_ITEM_SIZE;
 258 }
 259
 260 int ItemBase::type() const
 261 {
 262     return Type;
 263 }
 264
 265
 266 bool ItemBase::isInResizeArea(const QPointF &pos)
 267 {
 268     return (-pos.y() < pos.x() - m_size + 9);
 269 }
 270
 271 //============================================================================//
 272 //                                    QtBox                                   //
 273 //============================================================================//
 274
 275 QtBox::QtBox(int size, int x, int y) : ItemBase(size, x, y), m_texture(0)
 276 {
 277     for (int i = 0; i < 8; ++i) {
 278         m_vertices[i].setX(i & 1 ? 0.5f : -0.5f);
 279         m_vertices[i].setY(i & 2 ? 0.5f : -0.5f);
 280         m_vertices[i].setZ(i & 4 ? 0.5f : -0.5f);
 281     }
 282     for (int i = 0; i < 4; ++i) {
 283         m_texCoords[i].setX(i & 1 ? 1.0f : 0.0f);
 284         m_texCoords[i].setY(i & 2 ? 1.0f : 0.0f);
 285     }
 286     m_normals[0] = QVector3D(-1.0f, 0.0f, 0.0f);
 287     m_normals[1] = QVector3D(1.0f, 0.0f, 0.0f);
 288     m_normals[2] = QVector3D(0.0f, -1.0f, 0.0f);
 289     m_normals[3] = QVector3D(0.0f, 1.0f, 0.0f);
 290     m_normals[4] = QVector3D(0.0f, 0.0f, -1.0f);
 291     m_normals[5] = QVector3D(0.0f, 0.0f, 1.0f);
 292 }
 293
 294 QtBox::~QtBox()
 295 {
 296     if (m_texture)
 297         delete m_texture;
 298 }
 299
 300 ItemBase *QtBox::createNew(int size, int x, int y)
 301 {
 302     return new QtBox(size, x, y);
 303 }
 304
 305 void QtBox::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 306 {
 307     QRectF rect = boundingRect().translated(pos());
 308     float width = float(painter->device()->width());
 309     float height = float(painter->device()->height());
 310
 311     float left = 2.0f * float(rect.left()) / width - 1.0f;
 312     float right = 2.0f * float(rect.right()) / width - 1.0f;
 313     float top = 1.0f - 2.0f * float(rect.top()) / height;
 314     float bottom = 1.0f - 2.0f * float(rect.bottom()) / height;
 315     float moveToRectMatrix[] = {
 316         0.5f * (right - left), 0.0f, 0.0f, 0.0f,
 317         0.0f, 0.5f * (bottom - top), 0.0f, 0.0f,
 318         0.0f, 0.0f, 1.0f, 0.0f,
 319         0.5f * (right + left), 0.5f * (bottom + top), 0.0f, 1.0f
 320     };
 321
 322     painter->beginNativePainting();
 323
 324     glMatrixMode(GL_PROJECTION);
 325     glPushMatrix();
 326     glLoadMatrixf(moveToRectMatrix);
 327     gluPerspective(60.0, 1.0, 0.01, 10.0);
 328
 329     glMatrixMode(GL_MODELVIEW);
 330     glPushMatrix();
 331     glLoadIdentity();
 332
 333     //glEnable(GL_DEPTH_TEST);
 334     glEnable(GL_CULL_FACE);
 335     glEnable(GL_LIGHTING);
 336     glEnable(GL_COLOR_MATERIAL);
 337     glEnable(GL_NORMALIZE);
 338
 339     if(m_texture == 0)
 340         m_texture = new GLTexture2D(":/res/boxes/qt-logo.jpg", 64, 64);
 341     m_texture->bind();
 342     glEnable(GL_TEXTURE_2D);
 343
 344     glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
 345     float lightColour[] = {1.0f, 1.0f, 1.0f, 1.0f};
 346     float lightDir[] = {0.0f, 0.0f, 1.0f, 0.0f};
 347     glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColour);
 348     glLightfv(GL_LIGHT0, GL_POSITION, lightDir);
 349     glEnable(GL_LIGHT0);
 350
 351     glTranslatef(0.0f, 0.0f, -1.5f);
 352     glRotatef(ROTATE_SPEED_X * m_startTime.msecsTo(QTime::currentTime()), 1.0f, 0.0f, 0.0f);
 353     glRotatef(ROTATE_SPEED_Y * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 1.0f, 0.0f);
 354     glRotatef(ROTATE_SPEED_Z * m_startTime.msecsTo(QTime::currentTime()), 0.0f, 0.0f, 1.0f);
 355     int dt = m_startTime.msecsTo(QTime::currentTime());
 356     if (dt < 500)
 357         glScalef(dt / 500.0f, dt / 500.0f, dt / 500.0f);
 358
 359     for (int dir = 0; dir < 3; ++dir) {
 360         glColor4f(1.0f, 1.0f, 1.0f, 1.0);
 361
 362         glBegin(GL_TRIANGLE_STRIP);
 363         glNormal3fv(reinterpret_cast<float *>(&m_normals[2 * dir + 0]));
 364         for (int i = 0; i < 2; ++i) {
 365             for (int j = 0; j < 2; ++j) {
 366                 glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) | i]));
 367                 glVertex3fv(reinterpret_cast<float *>(&m_vertices[(i << ((dir + 2) % 3)) | (j << ((dir + 1) % 3))]));
 368             }
 369         }
 370         glEnd();
 371
 372         glBegin(GL_TRIANGLE_STRIP);
 373         glNormal3fv(reinterpret_cast<float *>(&m_normals[2 * dir + 1]));
 374         for (int i = 0; i < 2; ++i) {
 375             for (int j = 0; j < 2; ++j) {
 376                 glTexCoord2fv(reinterpret_cast<float *>(&m_texCoords[(j << 1) | i]));
 377                 glVertex3fv(reinterpret_cast<float *>(&m_vertices[(1 << dir) | (i << ((dir + 1) % 3)) | (j << ((dir + 2) % 3))]));
 378             }
 379         }
 380         glEnd();
 381     }
 382     m_texture->unbind();
 383
 384     //glDisable(GL_DEPTH_TEST);
 385     glDisable(GL_CULL_FACE);
 386     glDisable(GL_LIGHTING);
 387     glDisable(GL_COLOR_MATERIAL);
 388     glDisable(GL_TEXTURE_2D);
 389     glDisable(GL_LIGHT0);
 390     glDisable(GL_NORMALIZE);
 391
 392     glPopMatrix();
 393
 394     glMatrixMode(GL_PROJECTION);
 395     glPopMatrix();
 396
 397     painter->endNativePainting();
 398
 399     ItemBase::paint(painter, option, widget);
 400 }
 401
 402 //============================================================================//
 403 //                                 CircleItem                                 //
 404 //============================================================================//
 405
 406 CircleItem::CircleItem(int size, int x, int y) : ItemBase(size, x, y)
 407 {
 408      m_color = QColor::fromHsv(rand() % 360, 255, 255);
 409 }
 410
 411 void CircleItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 412 {
 413     int dt = m_startTime.msecsTo(QTime::currentTime());
 414
 415     qreal r0 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 3800) % 4000)));
 416     qreal r1 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 0) % 4000)));
 417     qreal r2 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 1800) % 4000)));
 418     qreal r3 = 0.5 * m_size * (1.0 - exp(-0.001 * ((dt + 2000) % 4000)));
 419
 420     if (r0 > r1)
 421         r0 = 0.0;
 422     if (r2 > r3)
 423         r2 = 0.0;
 424
 425     QPainterPath path;
 426     path.moveTo(r1, 0.0);
 427     path.arcTo(-r1, -r1, 2 * r1, 2 * r1, 0.0, 360.0);
 428     path.lineTo(r0, 0.0);
 429     path.arcTo(-r0, -r0, 2 * r0, 2 * r0, 0.0, -360.0);
 430     path.closeSubpath();
 431     path.moveTo(r3, 0.0);
 432     path.arcTo(-r3, -r3, 2 * r3, 2 * r3, 0.0, 360.0);
 433     path.lineTo(r0, 0.0);
 434     path.arcTo(-r2, -r2, 2 * r2, 2 * r2, 0.0, -360.0);
 435     path.closeSubpath();
 436     painter->setRenderHint(QPainter::Antialiasing, true);
 437     painter->setBrush(QBrush(m_color));
 438     painter->setPen(Qt::NoPen);
 439     painter->drawPath(path);
 440     painter->setBrush(Qt::NoBrush);
 441     painter->setPen(Qt::SolidLine);
 442     painter->setRenderHint(QPainter::Antialiasing, false);
 443
 444     ItemBase::paint(painter, option, widget);
 445 }
 446
 447 ItemBase *CircleItem::createNew(int size, int x, int y)
 448 {
 449     return new CircleItem(size, x, y);
 450 }
 451
 452 //============================================================================//
 453 //                                 SquareItem                                 //
 454 //============================================================================//
 455
 456 SquareItem::SquareItem(int size, int x, int y) : ItemBase(size, x, y)
 457 {
 458     m_image = QPixmap(":/res/boxes/square.jpg");
 459 }
 460
 461 void SquareItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 462 {
 463     int dt = m_startTime.msecsTo(QTime::currentTime());
 464     QTransform oldTransform = painter->worldTransform();
 465     int dtMod = dt % 2000;
 466     qreal amp = 0.002 * (dtMod < 1000 ? dtMod : 2000 - dtMod) - 1.0;
 467
 468     qreal scale = 0.6 + 0.2 * amp * amp;
 469     painter->setWorldTransform(QTransform().rotate(15.0 * amp).scale(scale, scale), true);
 470
 471     painter->drawPixmap(-m_size / 2, -m_size / 2, m_size, m_size, m_image);
 472
 473     painter->setWorldTransform(oldTransform, false);
 474     ItemBase::paint(painter, option, widget);
 475 }
 476
 477 ItemBase *SquareItem::createNew(int size, int x, int y)
 478 {
 479     return new SquareItem(size, x, y);
 480 }