Developer Documentation

ImageDialog.cc
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40 \*===========================================================================*/
41
42 #include "ImageDialog.hh"
43
44 #include <iostream>
45
46 #include <QPainter>
47
48 ImageDialog::ImageDialog(QImage _image, QWidget *parent) :
49 QDialog(parent),
50 imageWidth_(_image.width() ),
51 imageHeight_(_image.height() ),
52 dragging_(false)
53 {
54 setupUi(this);
55
56 pixmap_ = QPixmap::fromImage(_image).scaled(QSize(400,400),Qt::KeepAspectRatio,Qt::SmoothTransformation);
57
58 image->setPixmap(pixmap_);
59
60 // Set the correct boundaries for the spinboxes
61 minX->setMaximum(imageWidth_);
62 maxX->setMaximum(imageWidth_);
63 maxX->setValue(imageWidth_);
64 minY->setMaximum(imageHeight_);
65 maxY->setMaximum(imageHeight_);
66 maxY->setValue(imageHeight_);
67
68 // Connect the spin boxes
69 connect(minX,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
70 connect(maxX,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
71 connect(minY,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
72 connect(maxY,SIGNAL(valueChanged(int )),this,SLOT(slidersChanged()));
73
74 connect(image,SIGNAL(mouseButtonMoveEvent ( QPoint )) ,this,SLOT(mouseButtonMoveEvent ( QPoint )));
75 connect(image,SIGNAL(mouseButtonPressEvent ( QPoint )) ,this,SLOT(mouseButtonPressEvent ( QPoint )));
76 connect(image,SIGNAL(mouseButtonReleaseEvent ( QPoint )),this,SLOT(mouseButtonReleaseEvent ( QPoint )));
77
78 setMouseTracking ( true);
79
80 }
81
82
83 void ImageDialog::slidersChanged() {
84
85 // Copy to internal buffer
86 buffer_ = pixmap_;
87
88 QPainter painter( &buffer_);
89
90 QPen pen(Qt::red);
91
92 pen.setWidth(2);
93 painter.setPen( pen );
94
95 painter.setBrush(QBrush(Qt::red,Qt::NoBrush));
96
97 const int minXVal = minX->value();
98 const int maxXVal = maxX->value();
99 const int minYVal = minY->value();
100 const int maxYVal = maxY->value();
101
102 // Calculate the scaling factor that is used to fit the image to the widget
103 const double scale = (double)pixmap_.width() / (double)imageWidth_;
104
105 // Working on the actual pixmap -> no offsets!
106 painter.drawRect( minXVal * scale , minYVal * scale , (maxXVal-minXVal) * scale, (maxYVal-minYVal) * scale);
107
108 painter.end();
109
110 image->setPixmap(buffer_);
111 }
112
113 void ImageDialog::mouseButtonMoveEvent ( QPoint _p) {
114 if ( dragging_ ) {
115
116 // Calculate the right values for the position.
117 // The image is scaled to 400x400
118 // But the aspect ratio is kept. So we need to calculate the new sizes.
119
120
121
122 // Calculate the free space above and before the real image
123 // As we are working on the pixmap widget, we need to consider these offsets to calculate
124 // coordinates inside the real pixmap.
125 int xoffset = (400 - image->pixmap()->width() ) / 2;
126 int yoffset = (400 - image->pixmap()->height()) / 2;
127
128 // Calculate the scaling factor that is used to fit the image to the widget
129 const double scale = (double)imageWidth_ / (double)image->pixmap()->width();
130
131 int newXMin = (std::min(dragStartPoint_.x(),_p.x()) - xoffset ) * scale;
132 int newXMax = (std::max(dragStartPoint_.x(),_p.x()) - xoffset ) * scale;
133
134 int newYMin = (std::min(dragStartPoint_.y(),_p.y()) - yoffset ) * scale;
135 int newYMax = (std::max(dragStartPoint_.y(),_p.y()) - yoffset ) * scale;
136
137 minX->blockSignals(true);
138 maxX->blockSignals(true);
139 minY->blockSignals(true);
140 maxY->blockSignals(true);
141
142 minX->setValue(newXMin);
143 maxX->setValue(newXMax);
144 minY->setValue(newYMin);
145 maxY->setValue(newYMax);
146
147 minX->blockSignals(false);
148 maxX->blockSignals(false);
149 minY->blockSignals(false);
150 maxY->blockSignals(false);
151
152 slidersChanged();
153 }
154 }
155
156 void ImageDialog::mouseButtonPressEvent ( QPoint _p ) {
157 dragStartPoint_ = _p;
158 dragging_ = true;
159 }
160
161 void ImageDialog::mouseButtonReleaseEvent ( QPoint _p ) {
162 dragging_ = false;
163 }
164
165
166
167
168