OZ++ Sample: VideoCaptureView |
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* VideoCaptureView.cpp
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//2019/01/03
#include <opencv2/stitching.hpp>
#include <oz++/motif/RowColumn.h>
#include <oz++/opencv/OpenCVVideoCaptureView.h>
#include <oz++/opencv/OpenCVImageView.h>
#include <oz++/opencv/OpenCVScaleComboBox.h>
#include <oz++/opencv/OpenCVScrolledImageView.h>
namespace OZ {
class MainView :public OpenCVVideoCaptureView {
private:
//Inner class starts.
class VideoImageView: public OpenCVImageView {
private:
cv::Mat scaledImage;
public:
void display()
{
show(scaledImage);
}
public:
VideoImageView(View* parent, const char* name, Args& args)
:OpenCVImageView(parent, name, args)
{
}
void render(cv::Mat& frame, int scalingRatio)
{
rescale(frame, scaledImage, scalingRatio);
invalidate();
//Call display method directly.
display();
//refresh(); This will cause a flickering.
}
};
//Inner class ends
private:
SmartPtr<VideoImageView> videoImage;
SmartPtr<RowColumn> controlPane;
int imageScalingRatio;
SmartPtr<OpenCVScaleComboBox> scaleComboBox;
void resize(Dimension w, Dimension h)
{
int CP_WIDTH = 160;
w = w- CP_WIDTH;
if (videoImage && controlPane) {
videoImage ->resize(0, 0, w, h, 0);
controlPane ->reshape(w+2, 0, CP_WIDTH-4, h);
}
}
void scaleChanged(Action& action)
{
int val = scaleComboBox->getScale();
if (val > 0 && imageScalingRatio != val) {
imageScalingRatio = val;
printf("ScalingRatio %d\n", val);
}
}
public:
MainView(OpenCVApplication& applet, const char* name, Args& args)
:OpenCVVideoCaptureView(applet, name, args)
,imageScalingRatio(100)
{
try {
BulletinBoard* bboard = getBulletinBoard();
Args ar;
ar.reset();
videoImage = new VideoImageView(bboard, "", ar);
ar.reset();
controlPane = new RowColumn(bboard, "", ar);
const char* defaultScale = "60%";
imageScalingRatio = atoi(defaultScale);
ar.reset();
CompoundString scaler("Scale");
ar.set(XmNlabelString, scaler);
ar.set(XmNdefaultScale, defaultScale);
scaleComboBox = new OpenCVScaleComboBox(controlPane, "", ar);
scaleComboBox->addCallback(XmNselectionCallback, this,
(Callback)&MainView::scaleChanged, NULL);
sendConfigureEvent();
} catch(OZ::Exception& ex) {
caught(ex);
}
}
virtual void render()
{
try {
cv::Mat frame;
if (readVideoFrame(frame)) {
if (videoImage) {
videoImage->realize();
videoImage->render(frame, imageScalingRatio);
}
}
} catch (...) {
}
}
};
}
//
int main(int argc, char** argv)
{
try {
const char* appclass = argv[0];
OpenCVApplication applet(appclass, argc, argv);
Args args;
args.set(XmNwidth, 600);
args.set(XmNheight, 400);
args.set(XmNvideoDeviceIndex, 0);
args.set(XmNcaptureAutoStart, true);
MainView view(applet, argv[0], args);
view.realize();
applet.run(&view, 40); //40 msec
} catch (OZ::Exception& ex) {
caught(ex);
}
return 0;
}