ChartDirector是一個非常理想的圖表工具，它擁有廣泛的圖表類型、分層架構(gòu)、實時互動的大數(shù)據(jù)表、普遍適應(yīng)于各種應(yīng)用程序以及支持PDF和SVG圖標(biāo)等的優(yōu)點。此系列連載旨在介紹ChartDirector的實用教程，供大家學(xué)習(xí)討論。

漸變描影效果

此示例演示如何使用條形漸變效果著色水平條形圖，以及使用漸變顏色背景、部分圓形框架和繪圖區(qū)域的大小自動調(diào)整來適應(yīng)圖表。

• 通過使用BaseChart.linearGradientColor定義漸變顏色來實現(xiàn)漸變背景，然后使用BaseChart.setBackground將其設(shè)置為圖表背景顏色。
• 使用BaseChart.setRoundedFrame配置部分圓角框架。請注意，4個角中只有2個是圓角的。
• 使用XYChart.swapXY交換x軸和y軸，所以條形變?yōu)樗侥Ｊ健?/li>
• 條形漸變效果使用Chart :: barLighting定義，然后使用Layer.setBorderColor應(yīng)用于條形。
• 配置完整個圖表后，XYChart.packPlotArea方法用于調(diào)整繪圖區(qū)域大小，以便適應(yīng)繪圖區(qū)域和邊界框。

源代碼清單

以下代碼可在“cppdemo / gradientbar ”中找到。MFC版本的代碼可在“mfcdemo”中找到（僅限Windows版本）。QT版本的代碼可在“qtdemo”中找到。

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the bar chart
    double data[] = {1350, 1600, 1950, 2300, 2700};

    // The labels for the bar chart
    const char *labels[] = {"2001", "2002", "2003", "2004", "2005"};

    // The colors for the bars
    int colors[] = {0xcc0000, 0x66aaee, 0xeebb22, 0xcccccc, 0xcc88ff};

    // Create a PieChart object of size 600 x 380 pixels.
    XYChart *c = new XYChart(600, 380);

    // Use the white on black palette, which means the default text and line colors are white
    c->setColors(Chart::whiteOnBlackPalette);

    // Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use
    // rounded corners of 30 pixels radius for the top-left and bottom-right corners.
    c->setBackground(c->linearGradientColor(0, 0, 0, c->getHeight(), 0x0000cc, 0x000044));
    c->setRoundedFrame(0xffffff, 30, 0, 30, 0);

    // Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom margins
    // to the title.
    TextBox *title = c->addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18);
    title->setMargin(0, 0, 6, 6);

    // Add a separator line in white color just under the title
    c->addLine(20, title->getHeight(), c->getWidth() - 21, title->getHeight(), 0xffffff);

    // Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent
    // border and white grid lines
    c->setPlotArea(70, 80, 480, 240, -1, -1, Chart::Transparent, 0xffffff);

    // Swap the axis so that the bars are drawn horizontally
    c->swapXY();

    // Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with the
    // light intensity from 0.75 to 2.0
    c->addBarLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), IntArray(colors, (int)(
        sizeof(colors) / sizeof(colors[0]))))->setBorderColor(Chart::Transparent,
        Chart::barLighting(0.75, 2.0));

    // Set the labels on the x axis.
    c->xAxis()->setLabels(StringArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))));

    // Show the same scale on the left and right y-axes
    c->syncYAxis();

    // Set the bottom y-axis title using 10pt Arial Bold font
    c->yAxis()->setTitle("USD (millions)", "arialbd.ttf", 10);

    // Set y-axes to transparent
    c->yAxis()->setColors(Chart::Transparent);
    c->yAxis2()->setColors(Chart::Transparent);

    // Disable ticks on the x-axis by setting the tick color to transparent
    c->xAxis()->setTickColor(Chart::Transparent);

    // Set the label styles of all axes to 8pt Arial Bold font
    c->xAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis2()->setLabelStyle("arialbd.ttf", 8);

    // Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels from
    // the left edge, 25 pixels below the title, 50 pixels from the right edge, and 25 pixels from
    // the bottom edge.
    c->packPlotArea(30, title->getHeight() + 25, c->getWidth() - 50, c->getHeight() - 25);

    // Output the chart
    c->makeChart("gradientbar.png");

    //free up resources
    delete c;
    return 0;
}

圓柱型描影

此示例演示了對條形圖使用柱面著色效果。以及展示了繪圖區(qū)域兩側(cè)的拉絲金屬背景、圓形框架和軸標(biāo)簽。

• 通過使用Chart :: brushedSilverColor創(chuàng)建拉絲銀色，然后在XYChart.XYChart中使用它作為圖表背景顏色來實現(xiàn)拉絲銀色背景。
• 使用BaseChart.setRoundedFrame配置圓角框架。
• 通過BarLayer.setBarShape與CircleShape配置圓柱遮光效果。
• XYChart.syncYAxis用于在繪圖區(qū)域的兩側(cè)顯示兩個同步的y軸。
• Axis.setColors用于將y軸設(shè)置為“Transparent“，因此只有軸標(biāo)簽可見。
• 使用Axis.setLabelStyle將軸標(biāo)簽字體設(shè)置為Arial Bold 。

源代碼清單

以下代碼可在“cppdemo / cylinderlightbar ”中找到。MFC版本的代碼可在“mfcdemo”中找到（僅限Windows版本）。QT版本的代碼可在“qtdemo”中找到。

#include "chartdir.h"

int main(int argc, char *argv[])
{
    // The data for the bar chart
    double data[] = {450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700};

    // The labels for the bar chart
    const char *labels[] = {"1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004",
        "2005"};

    // Create a XYChart object of size 600 x 380 pixels. Set background color to brushed silver,
    // with a 2 pixel 3D border. Use rounded corners of 20 pixels radius.
    XYChart *c = new XYChart(600, 380, Chart::brushedSilverColor(), Chart::Transparent, 2);

    // Add a title to the chart using 18pt Times Bold Italic font. Set top/bottom margins to 8
    // pixels.
    c->addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)->setMargin(0, 0, 8, 8);

    // Set the plotarea at (70, 55) and of size 460 x 280 pixels. Use transparent border and black
    // grid lines. Use rounded frame with radius of 20 pixels.
    c->setPlotArea(70, 55, 460, 280, -1, -1, Chart::Transparent, 0x000000);
    c->setRoundedFrame(0xffffff, 20);

    // Add a multi-color bar chart layer using the supplied data. Set cylinder bar shape.
    c->addBarLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), IntArray(0, 0)
        )->setBarShape(Chart::CircleShape);

    // Set the labels on the x axis.
    c->xAxis()->setLabels(StringArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))));

    // Show the same scale on the left and right y-axes
    c->syncYAxis();

    // Set the left y-axis and right y-axis title using 10pt Arial Bold font
    c->yAxis()->setTitle("USD (millions)", "arialbd.ttf", 10);
    c->yAxis2()->setTitle("USD (millions)", "arialbd.ttf", 10);

    // Set y-axes to transparent
    c->yAxis()->setColors(Chart::Transparent);
    c->yAxis2()->setColors(Chart::Transparent);

    // Disable ticks on the x-axis by setting the tick color to transparent
    c->xAxis()->setTickColor(Chart::Transparent);

    // Set the label styles of all axes to 8pt Arial Bold font
    c->xAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis2()->setLabelStyle("arialbd.ttf", 8);

    // Output the chart
    c->makeChart("cylinderlightbar.jpg");

    //free up resources
    delete c;
    return 0;
}

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