GoJS：如何更改节点填充颜色？

Question

我正在使用GoJS制作图表。

我的图表配置（来自官方文档的示例）：

function init() {
    //......
    // define the Node template
    myDiagram.nodeTemplate =
        $(go.Node, "Auto",
            new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
            // define the node's outer shape, which will surround the TextBlock
            $(go.Shape, "RoundedRectangle",
                {
                    parameter1: 20,  // the corner has a large radius
                    fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
                    stroke: null,
                    portId: "",  // this Shape is the Node's port, not the whole Node
                    fromLinkable: true, fromLinkableSelfNode: true, fromLinkableDuplicates: true,
                    toLinkable: true, toLinkableSelfNode: true, toLinkableDuplicates: true,
                    cursor: "pointer"
                }),
            $(go.TextBlock,
                {
                    font: "bold 11pt helvetica, bold arial, sans-serif",
                    editable: true  // editing the text automatically updates the model data
                },
                new go.Binding("text").makeTwoWay())
        );
//......
}

我以以下方式创建节点：

var nodeOperations = new Object();

    for (var i = 0; i < countState; i++) {           
            var json = {'id': i, 'loc': nodesCenters[i].x +' '+nodesCenters[i].y, 'text': markedStateTable['digitStates'][i] + ', ' + markedStateTable['namedStates'][i]};

            nodes.push(json);
    }

现在，我需要以编程方式更改特定节点的填充颜色。 我正在尝试以下代码：

var data = myDiagram.model.findNodeDataForKey(0);

    myDiagram.model.setDataProperty(data, "fill", "green");

但是之后，我的图表不会显示。 并且控制台中没有错误。 我应该为节点设置新形状吗？ 或者我该怎么做？ 谢谢您的帮助！

Answer 1

您可以基于要基于属性值填充的节点来使用switch语句。 假设您有一个名为'namedStates'的属性，节点颜色应根据该属性更改，这是我的示例：

 $(go.Shape, "Rectangle", {
    name: "SHAPE",
    fill: "red",
    stroke: null,
    fromLinkable: true,
    toLinkable: true,
    cursor: "pointer"
}, new go.Binding("fill", "namedStates", function(type) {
    switch (type) {
        case 1:
            return "#FF4081";
        case 2:
            return "#303F9F";
        case 3:
            return "#00796B";
        case 4:
            return "#FF5722";
        case 5:
            return "#5D4037";
        case 6:
            return "#7B1FA2";
        default:
            return '#8BC34A';

    }
})),

Answer 2

您需要添加数据绑定以进行填充，否则节点数据中的值将变得毫无意义。 毕竟，如果您有多个具有多个不同填充的形状，那么拥有data.fill意味着什么？

因此，将new go.Binding("fill")到要更改的相关形状中：

function init() {
    //......
    // define the Node template
    myDiagram.nodeTemplate =
        $(go.Node, "Auto",
            new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
            // define the node's outer shape, which will surround the TextBlock
            $(go.Shape, "RoundedRectangle",
                {
                    parameter1: 20,  // the corner has a large radius
                    fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
                    stroke: null,
                    portId: "",  // this Shape is the Node's port, not the whole Node
                    fromLinkable: true, fromLinkableSelfNode: true, fromLinkableDuplicates: true,
                    toLinkable: true, toLinkableSelfNode: true, toLinkableDuplicates: true,
                    cursor: "pointer"
                },
            new go.Binding("fill") // NEW
            ),
            $(go.TextBlock,
                {
                    font: "bold 11pt helvetica, bold arial, sans-serif",
                    editable: true  // editing the text automatically updates the model data
                },
                new go.Binding("text").makeTwoWay())
        );
//......
}

但是之后，我的图表不会显示。

我不知道为什么会这样。 使用go-debug.js查看更多警告。

另请参阅有关GraphObject操作的本教程，包括使用setDataProperty： http : //gojs.net/latest/learn/graphobject.html

Answer 3

请在nodeArray中指定填充颜色

var nodeDataArray = [
    { key: 1, text: "Name", fill: "#ff5722", stroke: "#4d90fe", description: "geethu" }];

然后添加绑定到textBlock作为

  $(go.Shape, "RoundedRectangle", { fill: "#cce6ff" // the default fill, if there is no data-binding }, new go.Binding("fill", "fill")) 

 myDiagram.nodeTemplate =

    $(go.Node, "Horizontal", {
            isTreeExpanded: false,
            click: showDetail
        },
        $(go.Panel, "Auto",
            $(go.Shape, "RoundedRectangle", {
                fill: "#cce6ff", // the default fill, if there is no data-binding
                stroke: "#6699ff",
                height: 40,
                strokeWidth: 2,
                portId: "",
                cursor: "pointer", // the Shape is the port, not the whole Node
            }, new go.Binding("fill", "fill")),
            $(go.TextBlock, {
                    editable: true
                },
                new go.Binding("text", "text"))
        ),
        $("TreeExpanderButton", { alignment: go.Spot.Bottom, alignmentFocus: go.Spot.Top }, { visible: true })
    );