function down()

in web/js/input.js [173:211]

• 28 lines of code
• 10 McCabe index (conditional complexity)

function down(graph, poz) {

    // console.info("down", poz)
    
    if (!isGraphValid(graph)) return

    // On mouse down, if we are on a node, mark it as down.
    // We will check this in move() to see if it's being dragged.
    let downNodeId
    for (const node of graph.data.nodes) {
        if (webUtil.hitTest(graph, node.x, node.y, graph.NODE_RADIUS, poz.x, poz.y)) {
            node.down = true
            downNodeId = node.id
            break
        }
    }
    for (const node of graph.data.nodes) {
        if (node.id !== downNodeId) node.down = false
    }

    let hitEdge
    for (const edge of graph.data.edges) {
        if (webUtil.hitTestEdge(graph, edge, poz.x, poz.y)) {
            hitEdge = edge
            break
        }
    }

    if (downNodeId || hitEdge) return

    // Start dragging the canvas
    const ctx = graph.canvas.getContext("2d")
    const transform = ctx.getTransform()
    graph.canvasDrag = {
        start: poz,
        transform,
    }
    // console.log(`Start dragging at ${poz.x} ${poz.y}`)
}