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** Copyright (C) 2019 Luxoft Sweden AB
** Copyright (C) 2018 Pelagicore AG
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import QtQuick 2.12

Item {
    id: root

    width: 480
    height: 480

    property real value: 0
    property int upDuration: 2000
    property int downDuration: 1000
    property string fillImage: "images/dial_fill_color_left.png"
    property string circleRadius: "0.193"
    property string dialCursor: "images/dial_cursor.png"

    Image {
        id: meter
        property real min: -83.5
        property real max: 157
        width: root.width
        height: width - 1
        rotation: min + (max - min) * root.value
        source: Qt.resolvedUrl(root.dialCursor)
    }

    ShaderEffect {
        anchors.fill: meter
        property var pattern: Image {
            source: Qt.resolvedUrl("images/dial_pattern.png")
        }
        property var fill: Image {
            source: Qt.resolvedUrl(root.fillImage)
        }
        property real value: root.value

        fragmentShader: "
#define M_PI 3.141592653589793
#define INNER " + root.circleRadius + "

varying highp vec2 qt_TexCoord0;
uniform lowp float qt_Opacity;
uniform sampler2D pattern;
uniform sampler2D fill;
uniform lowp float value;

void main() {
    lowp vec4 pattern = texture2D(pattern, qt_TexCoord0);
    lowp vec4 fill = texture2D(fill, qt_TexCoord0);

    lowp vec2 pos = vec2(qt_TexCoord0.x - 0.5, 0.501 - qt_TexCoord0.y);
    lowp float d = length(pos);
    lowp float angle = atan(pos.x, pos.y) / (2.0 * M_PI);
    lowp float v = 0.66 * value - 0.33;

    // Flare pattern
    lowp vec4 color = mix(pattern, vec4(0.0), smoothstep(v, v + 0.1, angle));
    // Gradient fill color
    color += mix(fill, vec4(0.0), step(v, angle));
    // Punch out the center hole
    color = mix(vec4(0.0), color, smoothstep(INNER - 0.001, INNER + 0.001, d));
    // Fade out below 0
    gl_FragColor = mix(color, vec4(0.0), smoothstep(-0.35, -0.5, angle));
}
        "
    }
}