nova-shell/modules/OverviewBackdrop.qml

import QtQuick
import Quickshell
import Quickshell.Wayland
import "." as M

PanelWindow {
    id: root

    required property var screen

    color: "transparent"

    WlrLayershell.layer: WlrLayer.Background
    WlrLayershell.exclusiveZone: -1
    WlrLayershell.namespace: "nova-overview-backdrop"
    mask: Region {}

    anchors.top: true
    anchors.left: true
    anchors.right: true
    anchors.bottom: true

    // Solid dark background
    Rectangle {
        anchors.fill: parent
        color: M.Theme.base00
        opacity: 0.85
    }

    // Hex grid with gradient-filled cells, no outlines
    Canvas {
        anchors.fill: parent

        onPaint: {
            const ctx = getContext("2d");
            const w = width, h = height;
            ctx.clearRect(0, 0, w, h);

            const size = 50;
            const dx = size * 1.5;
            const dy = size * Math.sqrt(3);

            const c0 = M.Theme.base0C;
            const c1 = M.Theme.base0E;
            const c2 = M.Theme.base09;

            for (let col = -1; col < w / dx + 2; col++) {
                for (let row = -1; row < h / dy + 2; row++) {
                    const cx = col * dx;
                    const cy = row * dy + (col % 2 ? dy / 2 : 0);

                    // Position-based color interpolation across the screen
                    const fx = Math.max(0, Math.min(1, cx / w));
                    const fy = Math.max(0, Math.min(1, cy / h));

                    // Blend: left=base0C, center=base0E, right=base09, modulated by y
                    const t = fx;
                    const r = t < 0.5 ? c0.r + (c1.r - c0.r) * (t * 2) : c1.r + (c2.r - c1.r) * ((t - 0.5) * 2);
                    const g = t < 0.5 ? c0.g + (c1.g - c0.g) * (t * 2) : c1.g + (c2.g - c1.g) * ((t - 0.5) * 2);
                    const b = t < 0.5 ? c0.b + (c1.b - c0.b) * (t * 2) : c1.b + (c2.b - c1.b) * ((t - 0.5) * 2);

                    // Opacity varies: brighter near edges, dimmer in center
                    const distFromCenter = Math.sqrt(Math.pow(fx - 0.5, 2) + Math.pow(fy - 0.5, 2));
                    const alpha = 0.03 + distFromCenter * 0.06;

                    ctx.fillStyle = "rgba(" + Math.round(r * 255) + "," + Math.round(g * 255) + "," + Math.round(b * 255) + "," + alpha + ")";

                    ctx.beginPath();
                    for (let i = 0; i < 6; i++) {
                        const angle = Math.PI / 3 * i - Math.PI / 6;
                        const px = cx + size * 0.48 * Math.cos(angle);
                        const py = cy + size * 0.48 * Math.sin(angle);
                        if (i === 0)
                            ctx.moveTo(px, py);
                        else
                            ctx.lineTo(px, py);
                    }
                    ctx.closePath();
                    ctx.fill();
                }
            }
        }
    }

    // Horizontal scan line with glow trail
    Rectangle {
        id: hScan
        width: 2
        height: parent.height
        opacity: 0.2
        color: M.Theme.base0D
        NumberAnimation on x {
            from: -100
            to: root.width + 100
            duration: 8000
            loops: Animation.Infinite
            easing.type: Easing.InOutSine
        }

        Rectangle {
            anchors.top: parent.top
            anchors.bottom: parent.bottom
            anchors.right: parent.left
            width: 120
            gradient: Gradient {
                orientation: Gradient.Horizontal
                GradientStop {
                    position: 0
                    color: "transparent"
                }
                GradientStop {
                    position: 1
                    color: Qt.rgba(M.Theme.base0D.r, M.Theme.base0D.g, M.Theme.base0D.b, 0.08)
                }
            }
        }
    }

    // Vertical scan line
    Rectangle {
        width: parent.width
        height: 1
        opacity: 0.12
        color: M.Theme.base0E
        NumberAnimation on y {
            from: -50
            to: root.height + 50
            duration: 12000
            loops: Animation.Infinite
            easing.type: Easing.InOutSine
        }
    }

    // Diagonal scan
    Rectangle {
        width: 1
        height: parent.height * 1.5
        opacity: 0.06
        color: M.Theme.base09
        rotation: 30
        transformOrigin: Item.Top
        SequentialAnimation on x {
            loops: Animation.Infinite
            NumberAnimation {
                from: -200
                to: root.width + 200
                duration: 15000
                easing.type: Easing.InOutQuad
            }
            NumberAnimation {
                from: root.width + 200
                to: -200
                duration: 15000
                easing.type: Easing.InOutQuad
            }
        }
    }

    // Corner accent marks
    Repeater {
        model: [
            {
                cx: 40,
                cy: 40,
                col: M.Theme.base0C,
                dx: 1,
                dy: 1
            },
            {
                cx: -100,
                cy: 40,
                col: M.Theme.base09,
                dx: -1,
                dy: 1
            },
            {
                cx: 40,
                cy: -100,
                col: M.Theme.base0E,
                dx: 1,
                dy: -1
            },
            {
                cx: -100,
                cy: -100,
                col: M.Theme.base08,
                dx: -1,
                dy: -1
            }
        ]
        Item {
            required property var modelData
            x: modelData.dx > 0 ? modelData.cx : root.width + modelData.cx
            y: modelData.dy > 0 ? modelData.cy : root.height + modelData.cy

            Rectangle {
                width: 60
                height: 1
                color: parent.modelData.col
                opacity: 0.25
            }
            Rectangle {
                width: 1
                height: 60
                color: parent.modelData.col
                opacity: 0.25
            }

            Rectangle {
                width: 5
                height: 5
                radius: 2.5
                color: parent.modelData.col
                SequentialAnimation on opacity {
                    loops: Animation.Infinite
                    NumberAnimation {
                        to: 0.1
                        duration: 1500 + Math.random() * 1000
                        easing.type: Easing.InOutSine
                    }
                    NumberAnimation {
                        to: 0.5
                        duration: 1500 + Math.random() * 1000
                        easing.type: Easing.InOutSine
                    }
                }
            }
        }
    }

    // Floating particles
    Repeater {
        model: 15
        Rectangle {
            required property int index
            width: 2
            height: 2
            radius: 1
            color: [M.Theme.base0C, M.Theme.base0D, M.Theme.base0E, M.Theme.base09, M.Theme.base08][index % 5]
            opacity: 0.1 + Math.random() * 0.1

            NumberAnimation on x {
                from: -20
                to: root.width + 20
                duration: 20000 + index * 3000
                loops: Animation.Infinite
            }
            NumberAnimation on y {
                from: Math.random() * root.height
                to: Math.random() * root.height
                duration: 30000 + index * 2000
                loops: Animation.Infinite
                easing.type: Easing.InOutSine
            }
        }
    }
}