qml颜色渐变

import QtQuick 2.5

import QtQuick.Window 2.2

Window {

    visible: true

    width: 640

    height: 480

    title: qsTr("Hello World")

    Rectangle {

        width: 500

        height: 400

        anchors.left: parent.left

        anchors.leftMargin: 70

        anchors.top: parent.top

        anchors.topMargin: 40

        //颜色渐变

        gradient:Gradient {

            GradientStop {position: 0.0; color: "green"}

            GradientStop {position: 0.5; color: "red"}

            GradientStop {position: 1.0; color: "gray"}

        }

    }

}