Canvas resize

p3c0

Hi,

bq. “Canvas” does not accept the dimensions of the new image

Do you mean you want to draw the image using canvas with certain width and height ?
If so, then you can try this overloaded function
@
ctx.drawImage(myImage, 0, 0,50,50)
@

will draw image of dimension 50x50

? Offline

I want to "Canvas" always accept what the image dimensions will be loaded.
I also tried like you say.
@import QtQuick 2.2
import QtQuick.Controls 1.1

ApplicationWindow {
visible: true
width: 640
height: 480
color: "blue"
title: qsTr("Hello World")

menuBar: MenuBar {
    Menu {
        title: qsTr("File")
        MenuItem {
            text: qsTr("Exit")
            onTriggered: Qt.quit();
        }
    }
}

Image {
    id: myImage
    source: "http://i.snag.gy/5VVZR.jpg"
    //onWidthChanged: myCanvas.width = width
    //onHeightChanged: myCanvas.height = height
}

Canvas {
    id: myCanvas
    anchors.bottom: parent.bottom
    width: myImage.width
    height: myImage.height

    onPaint: {
        var ctx = getContext("2d")
        ctx.drawImage(myImage, 0, 0)
        //ctx.drawImage(myImage, 0, 0, myImage.width, myImage.height)
    }
}

MouseArea {
    anchors.fill: parent

    onClicked: {
        myImage.source = "http://i.snag.gy/qLdPZ.jpg"
        //myCanvas.requestPaint()
    }
}

}
@

p3c0

Sorry, but i'm not actully understanding your question.
Do you want to set the width and height of Canvas to that of myImage ?

? Offline

bq. Sorry, but i’m not actully understanding your question.
Do you want to set the width and height of Canvas to that of myImage ?

Yes. I want to canvas element always have the same dimensions as the image even if I load another image with different dimensions.

p3c0

Then your 1st code works as expected. I tested with Qt5.3.1

? Offline

I have Qt 5.3. For me it looks like this.
http://i.imgur.com/XT4j1E5.png
http://i.imgur.com/icVU9nq.png

Share your snapshots.

p3c0

Here:

http://imgur.com/KxXvvs0

p3c0

May be it is taking time to load the other image on your network and hence unable to determine the size.
You could try getting the "status":http://qt-project.org/doc/qt-5/qml-qtquick-image.html#status-prop of it and then assigning the dimensions.

? Offline

I will install qt again. This may solve the problem.

? Offline

I struggled with this for a few days, and the problem was solved by reinstalling Qt :)

Thanks p3c0

p3c0

That's strange. Did you notice anything during reinstallation that you might have missed in first ?