Connect a slider to control zoom on qml Camera

neda

Hi,
I am using Camera to take movies.
I want to use a slider to zooming video like zoom of google map.
I try to set digitalZoom for camera but I have this error: The camera doesn't support zooming.
I wrote code that is not working correctly. I have not found error, but video size will be very large, then I do not see video.

VideoOutput {
     id: viewfinder
     source: camera
     anchors.fill: parent
     focus : true                                
     transform: [
         Scale {
             id: zoomScale
         },
         Translate {
             id: zoomTranslate
         }
      ]

      //Keys.onLeftPressed: viewfinder.seek(viewfinder.position - 5000)
      //Keys.onRightPressed: viewfinder.seek(viewfinder.position + 5000)

      MouseArea {
           anchors.fill: parent
           acceptedButtons: Qt.AllButtons
           onClicked: {
              var zoomIn = mouse.button === Qt.LeftButton;
              zoomScale.origin.x = mouse.x;
              zoomScale.origin.y = mouse.y;
           }
      }

      Slider {
          id:zoomVideo
          orientation: Qt.Vertical
          minimumValue: 0
          maximumValue: 5000
          stepSize: 100

          onValueChanged: {
              zoomScale.xScale = zoomVideo.value
              zoomScale.yScale = zoomVideo.value
          }
      }
  }

raven-worx

@neda
maybe this helps?

neda

Thank you but The camera doesn't support zooming.
"camera.maximumDigitalZoom" and maximumOpticalZoom return 1

raven-worx

@neda said in Connect a slider to control zoom on qml Camera:

Thank you but The camera doesn't support zooming.

And you are then trying to convince it to still do so?
I think you will loose this one ;)

neda

I know my camera does not support "DigitalZoom" and "OpticalZoom". I want to find a way to zoom in on video taken from camera.

I've found another Question on SO but the proposed solution works for click whereas I would like to develop a solution for slider.

raven-worx

@neda
k got it now.
Your slider values are way too high for this. A value of 1.0 means 100%, 1.5 => 150% and so on.
But you are already increasing by 100 with the first slider step.

neda

@raven-worx

I change my code:
I want zooming in center of video like + zoom button in google map.

Slider {
                                          id:zoomVideo
                                          orientation: Qt.Vertical
                                          minimumValue: 1
                                          maximumValue: 2
                                          stepSize: 0.01
                                          anchors{
                                           left:parent.left
                                           leftMargin:5
                                           verticalCenter:parent.verticalCenter
                                          }
                                          onValueChanged: {
                                              zoomScale.xScale = zoomVideo.value
                                              zoomScale.yScale = zoomVideo.value
                                          }
                                      }