skyline应用-BS绘制饼状图

Posted 2020-08-09

  这个有现成的代码，把代码做一个简要的说明，具体实现效果，是在TE的地图画一个饼状图。

<script type="text/javascript">

        function createpie() {

//设置简单参数，包括半径等参数

            var sum = 0;

            var radius = 100;

            var angle = 0;

            var i;

//根据饼状图的分块，设置不同的颜色

            var color = [0x0000a0, 0x00ff60, 0x8000a0, 0xa0ff00, 0xff00ff, 0xff2000, 0x20c080, 0x402020, 0x8020a0, 0xff6060, 0xc0ffff, 0xff6060, 0x800040, 0xa00020];

            for (i = 1; i < 10; i++) {

                sum += i;

            }

//选择中心的位置，也可以自定义进行设置

            var cenpoint = SGWorld.Window.CenterPixelToWorld(0);

            var cpoint = cenpoint.Position;

            var sx = SGWorld.CoordServices.MoveCoord(cpoint.X, cpoint.Y, radius, 0).X;

            var sy = SGWorld.CoordServices.MoveCoord(cpoint.X, cpoint.Y, radius, 0).Y;

//根据每块的比例，设置旋转的角度，在polygon添加点

            for (i = 1; i < 10; i++) {

                var color1 = color[i];

                var langle = angle + parseFloat(i) / parseFloat(sum) * 360;

                var east = radius * Math.cos(2 * Math.PI * langle / 360);

                var north = radius * Math.sin(2 * Math.PI * langle / 360);

                var movcod = SGWorld.CoordServices.MoveCoord(cpoint.X, cpoint.Y, east, north);

                var polygon = "POLYGON((" + cpoint.X.toString() + " " + cpoint.Y.toString() + "," + sx.toString() + " " + sy.toString();

                var spl = (langle - angle) / 2;

                for (var j = 0; j < spl; j++) {

                    var sinint = Math.sin((angle + j * 2) * Math.PI / 180) * radius;

                    var cosint = Math.cos((angle + j * 2) * Math.PI / 180) * radius;

                    var movcodspl = SGWorld.CoordServices.MoveCoord(cpoint.X, cpoint.Y, cosint, sinint);

                    polygon += "," + movcodspl.X.toString() + " " + movcodspl.Y.toString();

                }

                polygon += "," + movcod.X.toString() + " " + movcod.Y.toString() + "," + cpoint.X.toString() + " " + cpoint.Y.toString() + "))";

                var igeometry = SGWorld.Creator.GeometryCreator.CreateGeometryFromWKT(polygon);

//根据点创建polygon

                var ipolygon = SGWorld.Creator.CreatePolygon(igeometry, color1, color1, 0, 0, "polygon");

                ipolygon.FillStyle.Color.SetAlpha(0.5);

                sx = movcod.X;

                sy = movcod.Y;

                angle = langle;

            }

        }

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