-
Notifications
You must be signed in to change notification settings - Fork 0
/
mygraphicsview.cpp
364 lines (282 loc) · 10 KB
/
mygraphicsview.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
//Our includes
#include "mygraphicsview.h"
//Qt includes
#include <QGraphicsScene>
#include <QGraphicsTextItem>
#include <QTextStream>
#include <QScrollBar>
#include <QMouseEvent>
#include <QWheelEvent>
#include <QDebug>
#include <QTime>
#include <QImage>
class MyPixmapItem : public QGraphicsPixmapItem
{
protected:
QImage *mImgPtr;
bool mImgUpdated;
QRect mImgPtrRegion;
public:
inline void setImgPtr( QImage *ptr, const QRect ®ion )
{
mImgPtr = ptr;
mImgPtrRegion = region;
mImgUpdated = true;
}
public:
virtual void paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 )
{
//qDebug("Paint %d %d", (int)pos().x(), (int) pos().y());
// only update if flag is set
if (mImgUpdated)
{
setPixmap( QPixmap::fromImage( mImgPtr->copy( mImgPtrRegion ) ) );
mImgUpdated = false;
//qDebug("Updated");
}
QGraphicsPixmapItem::paint( painter, option, widget );
}
};
void MyGraphicsView::setImage( const QImage &img, const QRect &updateRect )
{
const bool firstTime = (mScene->items().size() == 0) || ( img.width() != sceneRect().toRect().width() ) || ( img.height() != sceneRect().toRect().height() );
const unsigned blockSize = 100;
// check how many blocks fit in x and y (round up)
const unsigned nBlocksX = (img.width() + blockSize - 1) / blockSize;
const unsigned nBlocksY = (img.height() + blockSize - 1) / blockSize;
const unsigned nTotal = nBlocksX * nBlocksY;
//qDebug("nTotal: %d", (int) nTotal);
const unsigned imWidth = img.width();
const unsigned imHeight = img.height();
// copy image
mOrigImage = img;
//Set-up the view if it is the 1st time
if (firstTime)
{
qDebug("First time graphics view");
setSceneRect(0, 0, img.width(), img.height());
SetCenter(QPointF(img.width()/2.0, img.height()/2.0)); //A modified version of centerOn(), handles special cases
for (unsigned xb=0; xb < imWidth; xb += blockSize)
for (unsigned yb=0; yb < imHeight; yb += blockSize)
{
MyPixmapItem *pi = new MyPixmapItem();
mScene->addItem( pi );
// set coords
pi->setPos( xb, yb );
pi->setScale(1.0);
pi->setShapeMode( QGraphicsPixmapItem::QGraphicsPixmapItem::BoundingRectShape );
pi->setTransformationMode( Qt::FastTransformation );
}
}
unsigned int i=0;
for (unsigned xb=0; xb < imWidth; xb += blockSize)
for (unsigned yb=0; yb < imHeight; yb += blockSize)
{
MyPixmapItem *pi = ((MyPixmapItem *) mScene->items()[i]);
// this + 1 is a trick to avoid some artifacts when scaling
// it means that some blocks will overlap, but who cares
unsigned w = blockSize + 1;
unsigned h = blockSize + 1;
QPointF pos = pi->pos();
if ( pos.x() + w > imWidth )
w = imWidth - pos.x();
if ( pos.y() + h > imHeight )
h = imHeight - pos.y();
pi->setImgPtr( &mOrigImage, QRect( pos.x(), pos.y(), w, h ) );
i++;
}
viewport()->update();
//qDebug("Valid: %d", (int)updateRect.isValid());
/*
QRect toUpdate;
if (updateRect.isValid())
toUpdate = updateRect;
else
toUpdate = img.rect();
//toUpdate.setHeight(100);
//toUpdate.setWidth(100);
QRect thisToScreen = mapFromScene( toUpdate ).boundingRect();
QRect newUpdate = thisToScreen.intersect( viewport()->rect() );
viewport()->update( newUpdate );*/
//mScene->update( QRectF(0,0,10,10) );
//qDebug("Image: %d %d", img.size().width(), img.size().height() );
//mScene->addPixmap( mPixmap );
/*mScene->update();
update();*/
}
/**
* Sets up the subclassed QGraphicsView
*/
MyGraphicsView::MyGraphicsView(QWidget* parent) : QGraphicsView(parent)
{
mScaleFactor = 1.0;
setZoomLimits( 0.1, 7 );
setRenderHints(0);
//setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
//Set-up the scene
mScene = new QGraphicsScene(this);
setScene(mScene);
this->setCacheMode( QGraphicsView::CacheNone );
this->setViewportUpdateMode( QGraphicsView::NoViewportUpdate );
}
/**
* Sets the current centerpoint. Also updates the scene's center point.
* Unlike centerOn, which has no way of getting the floating point center
* back, SetCenter() stores the center point. It also handles the special
* sidebar case. This function will claim the centerPoint to sceneRec ie.
* the centerPoint must be within the sceneRec.
*/
//Set the current centerpoint in the
void MyGraphicsView::SetCenter(const QPointF& centerPoint)
{
//Get the rectangle of the visible area in scene coords
QRectF visibleArea = mapToScene(rect()).boundingRect();
//Get the scene area
QRectF sceneBounds = sceneRect();
double boundX = visibleArea.width() / 2.0;
double boundY = visibleArea.height() / 2.0;
double boundWidth = sceneBounds.width() - 2.0 * boundX;
double boundHeight = sceneBounds.height() - 2.0 * boundY;
//The max boundary that the centerPoint can be to
QRectF bounds(boundX, boundY, boundWidth, boundHeight);
if(bounds.contains(centerPoint)) {
//We are within the bounds
CurrentCenterPoint = centerPoint;
} else {
//We need to clamp or use the center of the screen
if(visibleArea.contains(sceneBounds)) {
//Use the center of scene ie. we can see the whole scene
CurrentCenterPoint = sceneBounds.center();
} else {
CurrentCenterPoint = centerPoint;
//We need to clamp the center. The centerPoint is too large
if(centerPoint.x() > bounds.x() + bounds.width()) {
CurrentCenterPoint.setX(bounds.x() + bounds.width());
} else if(centerPoint.x() < bounds.x()) {
CurrentCenterPoint.setX(bounds.x());
}
if(centerPoint.y() > bounds.y() + bounds.height()) {
CurrentCenterPoint.setY(bounds.y() + bounds.height());
} else if(centerPoint.y() < bounds.y()) {
CurrentCenterPoint.setY(bounds.y());
}
}
}
//Update the scrollbars
centerOn(CurrentCenterPoint);
}
#if 0
/**
* Handles when the mouse button is pressed
*/
void MyGraphicsView::mousePressEvent(QMouseEvent* event) {
//For panning the view
LastPanPoint = event->pos();
setCursor(Qt::ClosedHandCursor);
}
/**
* Handles when the mouse button is released
*/
void MyGraphicsView::mouseReleaseEvent(QMouseEvent* event) {
setCursor(Qt::OpenHandCursor);
LastPanPoint = QPoint();
}
/**
*Handles the mouse move event
*/
void MyGraphicsView::mouseMoveEvent(QMouseEvent* event) {
if(!LastPanPoint.isNull()) {
//Get how much we panned
QPointF delta = mapToScene(LastPanPoint) - mapToScene(event->pos());
LastPanPoint = event->pos();
//Update the center ie. do the pan
SetCenter(GetCenter() + delta);
}
}
/**
* Zoom the view in and out.
*/
void MyGraphicsView::wheelEvent(QWheelEvent* event) {
//Get the position of the mouse before scaling, in scene coords
QPointF pointBeforeScale(mapToScene(event->pos()));
//Get the original screen centerpoint
QPointF screenCenter = GetCenter(); //CurrentCenterPoint; //(visRect.center());
//Scale the view ie. do the zoom
double scaleFactor = 1.15; //How fast we zoom
if(event->delta() > 0) {
//Zoom in
scale(scaleFactor, scaleFactor);
} else {
//Zooming out
scale(1.0 / scaleFactor, 1.0 / scaleFactor);
}
//Get the position after scaling, in scene coords
QPointF pointAfterScale(mapToScene(event->pos()));
//Get the offset of how the screen moved
QPointF offset = pointBeforeScale - pointAfterScale;
//Adjust to the new center for correct zooming
QPointF newCenter = screenCenter + offset;
SetCenter(newCenter);
}
#endif
void MyGraphicsView::scale(double factor)
{
//Get the position of the mouse before scaling, in scene coords
QPointF pointBeforeScale(mapToScene( mLastMouseMovePt ));
//Get the original screen centerpoint
QPointF screenCenter = GetCenter(); //CurrentCenterPoint; //(visRect.center());
double tempScale = factor;
tempScale *= mScaleFactor;
if ( tempScale > mZoomMax )
tempScale = mZoomMax;
if (tempScale < mZoomMin)
tempScale = mZoomMin;
factor = tempScale / mScaleFactor;
mScaleFactor = tempScale;
//Scale the view ie. do the zoom
QGraphicsView::scale(factor, factor);
//Get the position after scaling, in scene coords
QPointF pointAfterScale(mapToScene( mLastMouseMovePt ));
//Get the offset of how the screen moved
QPointF offset = pointBeforeScale - pointAfterScale;
//Adjust to the new center for correct zooming
QPointF newCenter = screenCenter + offset;
SetCenter(newCenter);
}
void MyGraphicsView::pan( double x, double y )
{
QPointF delta( x, y );
SetCenter(GetCenter() + delta);
viewport()->update();
}
/**
* Need to update the center so there is no jolt in the
* interaction after resizing the widget.
*/
void MyGraphicsView::resizeEvent(QResizeEvent* event) {
//Get the rectangle of the visible area in scene coords
QRectF visibleArea = mapToScene(rect()).boundingRect();
SetCenter(visibleArea.center());
//Call the subclass resize so the scrollbars are updated correctly
QGraphicsView::resizeEvent(event);
}
QRect MyGraphicsView::getViewableRect() const
{
if (mScene->items().size() == 0)
return QRect();
QRect r =
mapToScene( viewport()->geometry() ).boundingRect().toRect();
//qDebug() << "Rect " << r;
if ( r.top() < 0 )
r.setTop(0);
if ( r.left() < 0 )
r.setLeft(0);
// get only intersection between pixmap and region
#ifdef QT4
r = r.intersect( mScene->sceneRect().toRect() );
#else
r = r.intersected( mScene->sceneRect().toRect() );
#endif
//qDebug() << "Rect2 " << r;
return r;
}