Gojs学习-形状

图形

2.0版中预定义了一些常见的图形："Rectangle", "Square", "RoundedRectangle", "Border", "Ellipse", "Circle", "TriangleRight", "TriangleDown", "TriangleLeft", "TriangleUp", "Triangle", "Diamond", "LineH", "LineV", "BarH", "BarV", "MinusLine", "PlusLine", "XLine"。

您可以在Figures.js文件中找到它们的所有定义。

https://github.com/NorthwoodsSoftware/GoJS/blob/master/extensions/Figures.js

您可以将Shape.figure属性设置为常用名称的形状。使用GraphObject，make时，可以将图形名称作为字符串参数传递。您可能还需要设置GraphObject.desiredSize或GraphObject.width和GraphObject.height属性，尽管由形状确定的面板确定尺寸也是很常见的;

以下是几个最常用的Shape图形：

  diagram.add(
        $(go.Node, "Horizontal",
          $(go.Shape, "Rectangle",        {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "RoundedRectangle", {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "Ellipse",          {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "Diamond",          {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "TriangleRight",    {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "TriangleDown",     {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "TriangleLeft",     {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "TriangleUp",       {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "MinusLine",        {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "PlusLine",         {  40, height: 60, margin: 4, fill: null }),
          $(go.Shape, "XLine",            {  40, height: 60, margin: 4, fill: null })
        ));

填充和描边

Shape.stroke属性指定用于绘制图形的轮廓刷。该Shape.fill属性指定用于填充形状的轮廓刷。附加的“笔画...”属性还控制如何绘制形状的轮廓。最常见的此类属性是Shape.strokeWidth。

         diagram.add(
             $(go.Node, "Horizontal",
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4
                             }),  // default fill and stroke are "black"
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: "green" }),
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: "green", stroke: null }),
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: null, stroke: "green" }),
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: null, stroke: "green", strokeWidth: 3 }),
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: null, stroke: "green", strokeWidth: 6 }),
               $(go.Shape, { figure: "Club",  40, height: 40, margin: 4,
                             fill: "green", background: "orange" })
             ));

 该Shape.stroke和Shape.fill性质采取笔刷颜色，但大多数情况下都获得了CSS颜色字符串来表示纯色画笔。这两个属性默认为纯黑色。但是，通常将其中之一分配为null或“transparent”。无效画笔意味着该笔触或填充没有绘制任何内容。透明的笔刷具有相同的外观，但是测试行为不同。具有null Shape.fill的形状会产生“空心”形状-在形状内部单击不会“命中”该形状，因此不会选择该形状所在的Node。但是具有透明填充的形状会产生“填充”形状-形状内的鼠标事件将“命中”。

     diagram.add(
                $(go.Node, "Table",
                  $(go.Shape, { row: 0, column: 0, figure: "Club",  60, height: 60, margin: 4,
                                fill: "green" }),
                  $(go.TextBlock, "green", { row: 1, column: 0 }),
                  $(go.Shape, { row: 0, column: 1, figure: "Club",  60, height: 60, margin: 4,
                                fill: "white" }),
                  $(go.TextBlock, "white", { row: 1, column: 1 }),
                  $(go.Shape, { row: 0, column: 2, figure: "Club",  60, height: 60, margin: 4,
                                fill: "transparent" }),
                  $(go.TextBlock, "transparent", { row: 1, column: 2 }),
                  $(go.Shape, { row: 0, column: 3, figure: "Club",  60, height: 60, margin: 4,
                                fill: null }),
                  $(go.TextBlock, "null", { row: 1, column: 3 })
                ));

角度和比例

除了设置GraphObject.desiredSize或GraphObject.width和GraphObject.height来声明Shape的大小外，还可以设置其他属性来影响外观。例如，您可以设置GraphObject.angle和GraphObject.scale属性。

          diagram.add(
            $(go.Node, "Table",
              $(go.Shape, { row: 0, column: 1,
                            figure: "Club", fill: "green",  40, height: 40,
                            }),  // default angle is zero; default scale is one
              $(go.Shape, { row: 0, column: 2,
                            figure: "Club", fill: "green",  40, height: 40,
                            angle: 30 }),
              $(go.Shape, { row: 0, column: 3,
                            figure: "Club", fill: "green",  40, height: 40,
                            scale: 1.5 }),
              $(go.Shape, { row: 0, column: 4,
                            figure: "Club", fill: "green",  40, height: 40,
                            angle: 30, scale: 1.5 })
            ));

该Shape.fill和GraphObject.background刷子规模，并与形状一起转动。所述GraphObject.areaBackground绘制在含面板的坐标，所以它不会受该对象的标度或角度。

以下两个形状分别使用三个单独的线性渐变笔刷，三个属性中的每个都使用一个。注意左侧未旋转的形状。因为它的GraphObject.background笔刷是不透明的，所以您看不到GraphObject.areaBackground笔刷填充了它后面的相同区域。

var bluered = $(go.Brush, "Linear", { 0.0: "blue", 1.0: "red" });
  var yellowgreen = $(go.Brush, "Linear", { 0.0: "yellow", 1.0: "green" });
  var grays = $(go.Brush, "Linear", { 0.0: "black", 1.0: "lightgray" });

  diagram.add(
    $(go.Node, "Table",
      $(go.Shape, { row: 0, column: 0,
                    figure: "Club",  40, height: 40, angle: 0, scale: 1.5,
                    fill: bluered,
                    background: yellowgreen,
                    areaBackground: grays
                  }),
      $(go.Shape, { row: 0, column: 1,  10, fill: null, stroke: null }),
      $(go.Shape, { row: 0, column: 2,
                    figure: "Club",  40, height: 40, angle: 45, scale: 1.5,
                    fill: bluered,
                    background: yellowgreen,
                    areaBackground: grays
                  })
    ));

还可以设置自定义图形。

https://gojs.net/latest/intro/shapes.html