MiniMap QML Type

The abstract view: a fitted 2D projection of the scene, drawn by the lab. More...

• List of all members, including inherited members

Properties

• bounds : var
• contentPadding : real
• draw : var
• emptyText : string
• map : var
• revision : int
• uniformScale : bool

Methods

• void repaint()

Detailed Description

Half of the highest-value pattern the labs know - dual representation, one model: the 3D scene shows what you built, this panel shows what it is, and both read the same data so they cannot disagree. Electronics draws a circuit diagram in one; street-network draws its lane graph.

Both had implemented the same two things by hand: a fit-to-content projection (fit what exists, not the whole sheet - an empty board would otherwise squeeze the drawing into a corner) and the repaint plumbing that keeps a Canvas in step with a model that mutates in place. This owns both; the lab supplies bounds and a draw callback and nothing else.

draw receives the context and a map with px(), py() and the scale s, so the lab's paint code never does arithmetic on the panel's size.

MiniMap {
    title: LabLang.t("plan.title")
    tag: "M"
    width: LabTheme.px(258); height: LabTheme.px(190)
    revision: root.graphRev
    emptyText: LabLang.t("plan.empty")
    bounds: RoadGraph.bounds(root.graph)          // {x0, y0, x1, y1, empty}
    draw: (ctx, map) => {
        for (const lane of root.net.lanes) {
            ctx.strokeStyle = LabTheme.muted.toString()
            ctx.beginPath()
            ctx.moveTo(map.px(lane.x0), map.py(lane.z0))
            ctx.lineTo(map.px(lane.x1), map.py(lane.z1))
            ctx.stroke()
        }
    }
}

See also LabPanel and Plot2D.

Property Documentation

Method Documentation