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圖表控件ChartDirector使用教程：創建極地散點圖

原創|其它|編輯：郝浩|2012-11-27 10:24:04.000|閱讀 1722 次

概述：在這個例子中講述了如何在ChartDirector中創建極地散點圖，同時還演示了如何沿著角度的方向交替使用背景顏色。

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在這個例子中講述了如何在ChartDirector中創建極地散點圖，同時還演示了如何沿著角度的方向交替使用背景顏色。

這樣的極地散點圖可以使用創建極線圖加數據符號來繪制，線條的寬度設置為0，這樣擦可以只看見數據符號，出現散點圖的效果。

圖表控件ChartDirector使用教程：創建極地散點圖

詳細的步驟如下：

使用PolarChart.addLineLayer創建一個極線圖
使用PolarLayer.setDataSymbol啟動數據符號
使用PolarLayer.setLineWidth設置線條的寬度為0

在這個例子中，值得注意的是這個圖表的背景色是沿著角度的方向使用了兩種交互的顏色而這個效果呢就是使用PolarChart.setPlotAreaBg實現的。

具體的代碼如下：

// ChartDirector for ColdFusion API Access Point
cd = CreateObject("java", "ChartDirector.CFChart");

// A utility to allow us to create arrays with data in one line of code
function Array() {
    var result = ArrayNew(1);
    var i = 0;
    for (i = 1; i LTE ArrayLen(arguments); i = i + 1)
        result[i] = arguments[i];
    return result;
}

// The data for the chart
data0 = Array(43, 89, 76, 64, 48, 18, 92, 68, 44, 79, 71, 85);
angles0 = Array(45, 96, 169, 258, 15, 30, 330, 260, 60, 75, 110, 140);

data1 = Array(50, 91, 26, 29, 80, 53, 62, 87, 19, 40);
angles1 = Array(230, 210, 240, 310, 179, 250, 244, 199, 89, 160);

data2 = Array(88, 65, 76, 49, 80, 53);
angles2 = Array(340, 310, 340, 210, 30, 300);

// The labels on the angular axis (spokes)
labels = Array("North", "North<*br*>East", "East", "South<*br*>East", "South",
    "South<*br*>West", "West", "North<*br*>West");

// Create a PolarChart object of size 460 x 460 pixels
c = cd.PolarChart(460, 460);

// Add a title to the chart at the top left corner using 15pts Arial Bold Italic font
c.addTitle2(cd.TopLeft, "<*underline=2*>Plants in Wonderland", "Arial Bold Italic",
    15);

// Set center of plot area at (230, 240) with radius 180 pixels
c.setPlotArea(230, 240, 180);

// Use alternative light grey/dark grey sector background color
c.setPlotAreaBg("0xdddddd", "0xeeeeee", False);

// Set the grid style to circular grid
c.setGridStyle(False);

// Add a legend box at the top right corner of the chart using 9 pts Arial Bold font
c.addLegend(459, 0, True, "Arial Bold", 9).setAlignment(cd.TopRight);

// Set angular axis as 0 - 360, either 8 spokes
c.angularAxis().setLinearScale2(0, 360, labels);

// Set the radial axis label format
c.radialAxis().setLabelFormat("{value} km");

// Add a blue (0xff) polar line layer to the chart using (data0, angle0)
layer0 = c.addLineLayer(data0, "0x0000ff", "Immortal Weed");
layer0.setAngles(angles0);

layer0.setLineWidth(0);
layer0.setDataSymbol(cd.TriangleSymbol, 11);

// Add a red (0xff0000) polar line layer to the chart using (data1, angles1)
layer1 = c.addLineLayer(data1, "0xff0000", "Precious Flower");
layer1.setAngles(angles1);

// Disable the line by setting its width to 0, so only the symbols are visible
layer1.setLineWidth(0);

// Use a 11 pixel diamond data point symbol
layer1.setDataSymbol(cd.DiamondSymbol, 11);

// Add a green (0x00ff00) polar line layer to the chart using (data2, angles2)
layer2 = c.addLineLayer(data2, "0x00ff00", "Magical Tree");
layer2.setAngles(angles2);

// Disable the line by setting its width to 0, so only the symbols are visible
layer2.setLineWidth(0);

// Use a 9 pixel square data point symbol
layer2.setDataSymbol(cd.SquareSymbol, 9);

// Output the chart
chart1URL = c.makeSession(GetPageContext(), "chart1");

// Include tool tip for the chart
imageMap1 = c.getHTMLImageMap("", "",
    "title='{dataSetName} at ({value} km, {angle} deg)'");

</cfscript>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Polar Scatter Chart
</div>
<hr style="border:solid 1px #000080" />
<cfoutput>
<div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em">
    <a href='viewsource.cfm?file=#CGI.SCRIPT_NAME#'>View Source Code</a>
</div>
<img src="getchart.cfm?#chart1URL#" usemap="##map1" border="0" />
<map name="map1">#imageMap1#</map>
</cfoutput>
</body>
</html>

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