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Fix pixel value rendering for non-fixed-size QT windows
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@LeszekSwirski
LeszekSwirski committed Jun 6, 2013
1 parent 27bff3c commit 9a1cc06
Showing 1 changed file with 35 additions and 36 deletions.
71 changes: 35 additions & 36 deletions modules/highgui/src/window_QT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2651,17 +2651,16 @@ void DefaultViewPort::paintEvent(QPaintEvent* evnt)
//Now disable matrixWorld for overlay display
myPainter.setWorldMatrixEnabled(false);

//overlay pixel values if zoomed in far enough
if (param_matrixWorld.m11()*ratioX >= threshold_zoom_img_region &&
param_matrixWorld.m11()*ratioY >= threshold_zoom_img_region)
{
drawImgRegion(&myPainter);
}

//in mode zoom/panning
if (param_matrixWorld.m11() > 1)
{
if (param_matrixWorld.m11() >= threshold_zoom_img_region)
{
if (centralWidget->param_flags == CV_WINDOW_NORMAL)
startDisplayInfo("WARNING: The values displayed are the resized image's values. If you want the original image's values, use CV_WINDOW_AUTOSIZE", 1000);

drawImgRegion(&myPainter);
}

drawViewOverview(&myPainter);
}

Expand Down Expand Up @@ -2887,50 +2886,50 @@ void DefaultViewPort::drawStatusBar()
//accept only CV_8UC1 and CV_8UC8 image for now
void DefaultViewPort::drawImgRegion(QPainter *painter)
{

if (nbChannelOriginImage!=CV_8UC1 && nbChannelOriginImage!=CV_8UC3)
return;

qreal offsetX = param_matrixWorld.dx()/param_matrixWorld.m11();
double pixel_width = param_matrixWorld.m11()*ratioX;
double pixel_height = param_matrixWorld.m11()*ratioY;

qreal offsetX = param_matrixWorld.dx()/pixel_width;
offsetX = offsetX - floor(offsetX);
qreal offsetY = param_matrixWorld.dy()/param_matrixWorld.m11();
qreal offsetY = param_matrixWorld.dy()/pixel_height;
offsetY = offsetY - floor(offsetY);

QSize view = size();
QVarLengthArray<QLineF, 30> linesX;
for (qreal _x = offsetX*param_matrixWorld.m11(); _x < view.width(); _x += param_matrixWorld.m11() )
for (qreal _x = offsetX*pixel_width; _x < view.width(); _x += pixel_width )
linesX.append(QLineF(_x, 0, _x, view.height()));

QVarLengthArray<QLineF, 30> linesY;
for (qreal _y = offsetY*param_matrixWorld.m11(); _y < view.height(); _y += param_matrixWorld.m11() )
for (qreal _y = offsetY*pixel_height; _y < view.height(); _y += pixel_height )
linesY.append(QLineF(0, _y, view.width(), _y));


QFont f = painter->font();
int original_font_size = f.pointSize();
//change font size
//f.setPointSize(4+(param_matrixWorld.m11()-threshold_zoom_img_region)/5);
f.setPixelSize(10+(param_matrixWorld.m11()-threshold_zoom_img_region)/5);
f.setPixelSize(10+(pixel_height-threshold_zoom_img_region)/5);
painter->setFont(f);
QString val;
QRgb rgbValue;

QPointF point1;//sorry, I do not know how to name it
QPointF point2;//idem

for (int j=-1;j<height()/param_matrixWorld.m11();j++)//-1 because display the pixels top rows left colums
for (int i=-1;i<width()/param_matrixWorld.m11();i++)//-1
for (int j=-1;j<height()/pixel_height;j++)//-1 because display the pixels top rows left columns
for (int i=-1;i<width()/pixel_width;i++)//-1
{
point1.setX((i+offsetX)*param_matrixWorld.m11());
point1.setY((j+offsetY)*param_matrixWorld.m11());

matrixWorld_inv.map(point1.x(),point1.y(),&point2.rx(),&point2.ry());

point2.rx()= (long) (point2.x() + 0.5);
point2.ry()= (long) (point2.y() + 0.5);

if (point2.x() >= 0 && point2.y() >= 0)
rgbValue = image2Draw_qt_resized.pixel(QPoint(point2.x(),point2.y()));
// Calculate top left of the pixel's position in the viewport (screen space)
QPointF pos_in_view((i+offsetX)*pixel_width, (j+offsetY)*pixel_height);

// Calculate top left of the pixel's position in the image (image space)
QPointF pos_in_image = matrixWorld_inv.map(pos_in_view);// Top left of pixel in view
pos_in_image.rx() = pos_in_image.x()/ratioX;
pos_in_image.ry() = pos_in_image.y()/ratioY;
QPoint point_in_image(pos_in_image.x() + 0.5f,pos_in_image.y() + 0.5f);// Add 0.5 for rounding

QRgb rgbValue;
if (image2Draw_qt.valid(point_in_image))
rgbValue = image2Draw_qt.pixel(point_in_image);
else
rgbValue = qRgb(0,0,0);

Expand All @@ -2943,29 +2942,29 @@ void DefaultViewPort::drawImgRegion(QPainter *painter)
painter->drawText(QRect(point1.x(),point1.y(),param_matrixWorld.m11(),param_matrixWorld.m11()/2),
Qt::AlignCenter, val);
*/
QString val;

val = tr("%1").arg(qRed(rgbValue));
painter->setPen(QPen(Qt::red, 1));
painter->drawText(QRect(point1.x(),point1.y(),param_matrixWorld.m11(),param_matrixWorld.m11()/3),
painter->drawText(QRect(pos_in_view.x(),pos_in_view.y(),pixel_width,pixel_height/3),
Qt::AlignCenter, val);

val = tr("%1").arg(qGreen(rgbValue));
painter->setPen(QPen(Qt::green, 1));
painter->drawText(QRect(point1.x(),point1.y()+param_matrixWorld.m11()/3,param_matrixWorld.m11(),param_matrixWorld.m11()/3),
painter->drawText(QRect(pos_in_view.x(),pos_in_view.y()+pixel_height/3,pixel_width,pixel_height/3),
Qt::AlignCenter, val);

val = tr("%1").arg(qBlue(rgbValue));
painter->setPen(QPen(Qt::blue, 1));
painter->drawText(QRect(point1.x(),point1.y()+2*param_matrixWorld.m11()/3,param_matrixWorld.m11(),param_matrixWorld.m11()/3),
painter->drawText(QRect(pos_in_view.x(),pos_in_view.y()+2*pixel_height/3,pixel_width,pixel_height/3),
Qt::AlignCenter, val);

}

if (nbChannelOriginImage==CV_8UC1)
{

val = tr("%1").arg(qRed(rgbValue));
painter->drawText(QRect(point1.x(),point1.y(),param_matrixWorld.m11(),param_matrixWorld.m11()),
QString val = tr("%1").arg(qRed(rgbValue));
painter->drawText(QRect(pos_in_view.x(),pos_in_view.y(),pixel_width,pixel_height),
Qt::AlignCenter, val);
}
}
Expand Down

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