X-lanni
99 lines
1.8 KiB
C++
99 lines
1.8 KiB
C++
/*
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* ImageView.h
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*
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* Created on: 2012-06-20
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* Author: mathieu
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*/
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#ifndef IMAGEVIEW_H_
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#define IMAGEVIEW_H_
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#include "rtabmap/gui/rtabmap_gui_export.h" // DLL export/import defines
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#include <QWidget>
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#include <QtGui/QPainter>
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class RTABMAP_GUI_EXPORT UImageView : public QWidget
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{
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Q_OBJECT;
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public:
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UImageView(QWidget * parent = 0) : QWidget(parent) {}
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~UImageView() {}
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void setBackgroundBrush(const QBrush & brush) {brush_ = brush;}
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public Q_SLOTS:
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void setImage(const QImage & image)
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{
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pixmap_ = QPixmap::fromImage(image);
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this->update();
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}
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private:
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void computeScaleOffsets(float & scale, float & offsetX, float & offsetY)
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{
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scale = 1.0f;
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offsetX = 0.0f;
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offsetY = 0.0f;
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if(!pixmap_.isNull())
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{
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float w = pixmap_.width();
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float h = pixmap_.height();
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float widthRatio = float(this->rect().width()) / w;
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float heightRatio = float(this->rect().height()) / h;
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if(widthRatio < heightRatio)
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{
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scale = widthRatio;
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}
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else
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{
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scale = heightRatio;
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}
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w *= scale;
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h *= scale;
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if(w < this->rect().width())
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{
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offsetX = (this->rect().width() - w)/2.0f;
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}
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if(h < this->rect().height())
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{
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offsetY = (this->rect().height() - h)/2.0f;
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}
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}
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}
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protected:
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virtual void paintEvent(QPaintEvent *event)
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{
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QPainter painter(this);
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//Draw background
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painter.save();
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painter.setBrush(brush_);
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painter.drawRect(this->rect());
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painter.restore();
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if(!pixmap_.isNull())
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{
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painter.save();
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//Scale
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float ratio, offsetX, offsetY;
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this->computeScaleOffsets(ratio, offsetX, offsetY);
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painter.translate(offsetX, offsetY);
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painter.scale(ratio, ratio);
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painter.drawPixmap(QPoint(0,0), pixmap_);
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painter.restore();
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}
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}
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private:
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QPixmap pixmap_;
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QBrush brush_;
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};
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#endif /* IMAGEVIEW_H_ */
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