（六）用ChartDirector绘制财务图表

财务报表在金融领域应用广泛，而证券交易等实时变更的金融信息则需要用财务图表以图形化的方式进行展示。今天跟大家演示如何用Web图表控件ChartDirector创建一个功能完整的财务图表，这个图表由HLOC、流动平均线、Bollinger band, volume bars, RSI和动能指标组成。如图所示：

主要步骤：

在本例中引用了FinanceChart库的插件，这样创建一个复杂的财务图表会相对容易一些。主要有以下几个步骤：

• 创建一个新的FinanceChart对象
• 用FinanceChart.setData设置图表的数据
• 用 FinanceChart.addMainChart添加主要的图表
• 用FinanceChart.addSimpleMovingAvg向主表中添加比较简单的流动平均线
• 用FinanceChart.addHLOC向主表中添加HLOC符号
• 用FinanceChart.addBollingerBand在主表中添加Bollinger Band
• 用FinanceChart.addVolBars向图表中添加volume bars
• 用FinanceChart.addRSI添加一个RSI指示器
• 用FinanceChart.addMomentum添加一个Momentum指示器

简单起见，这个图表没有连接到数据库，而用RanTable对象模拟数据库。PS：RanTable是一个ChartDirector工具类，可用随机数创建表格。

ChartDirector创建财务图表示例代码：

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#include "FinanceChart.h"   int main(int argc, char *argv[]) {     // Create a finance chart demo containing 100 days of data     int noOfDays = 100;       // To compute moving averages starting from the first day, we need to get extra     // data points before the first day     int extraDays = 30;       // In this exammple, we use a random number generator utility to simulate the     // data. We set up the random table to create 6 cols x (noOfDays + extraDays)     // rows, using 9 as the seed.     RanTable *rantable = new RanTable(9, 6, noOfDays + extraDays);       // Set the 1st col to be the timeStamp, starting from Sep 4, 2002, with each row     // representing one day, and counting week days only (jump over Sat and Sun)     rantable->setDateCol(0, Chart::chartTime(2002, 9, 4), 86400, true);       // Set the 2nd, 3rd, 4th and 5th columns to be high, low, open and close data.     // The open value starts from 100, and the daily change is random from -5 to 5.     rantable->setHLOCCols(1, 100, -5, 5);       // Set the 6th column as the vol data from 5 to 25 million     rantable->setCol(5, 50000000, 250000000);       // Now we read the data from the table into arrays     DoubleArray timeStamps = rantable->getCol(0);     DoubleArray highData = rantable->getCol(1);     DoubleArray lowData = rantable->getCol(2);     DoubleArray openData = rantable->getCol(3);     DoubleArray closeData = rantable->getCol(4);     DoubleArray volData = rantable->getCol(5);       // Create a FinanceChart object of width 640 pixels     FinanceChart *c = new FinanceChart(640);       // Add a title to the chart     c->addTitle("Finance Chart Demonstration");       // Set the data into the finance chart object     c->setData(timeStamps, highData, lowData, openData, closeData, volData, extraDays         );       // Add the main chart with 240 pixels in height     c->addMainChart(240);       // Add a 5 period simple moving average to the main chart, using brown color     c->addSimpleMovingAvg(5, 0x663300);       // Add a 20 period simple moving average to the main chart, using purple color     c->addSimpleMovingAvg(20, 0x9900ff);       // Add HLOC symbols to the main chart, using green/red for up/down days     c->addHLOC(0x008000, 0xcc0000);       // Add 20 days bollinger band to the main chart, using light blue (9999ff) as the     // border and semi-transparent blue (c06666ff) as the fill color     c->addBollingerBand(20, 2, 0x9999ff, 0xc06666ff);       // Add a 75 pixels volume bars sub-chart to the bottom of the main chart, using     // green/red/grey for up/down/flat days     c->addVolBars(75, 0x99ff99, 0xff9999, 0x808080);       // Append a 14-days RSI indicator chart (75 pixels high) after the main chart.     // The main RSI line is purple (800080). Set threshold region to +/- 20 (that is,     // RSI = 50 +/- 25). The upper/lower threshold regions will be filled with red     // (ff0000)/blue (0000ff).     c->addRSI(75, 14, 0x800080, 20, 0xff0000, 0x0000ff);       // Append a 12-days momentum indicator chart (75 pixels high) using blue (0000ff)     // color.     c->addMomentum(75, 12, 0x0000ff);       // Output the chart     c->makeChart("finance.png");       //free up resources     delete rantable;     delete c;     return 0; }

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