翻譯|使用教程|編輯:黃竹雯|2018-12-20 13:52:21.000|閱讀 479 次
概述:Web圖表控件ChartDirector連載教程分享之條形圖描影,內(nèi)附下載和鏈接。
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ChartDirector是一個(gè)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(shí)時(shí)互動(dòng)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(diǎn)。此系列連載旨在介紹ChartDirector的實(shí)用教程,供大家學(xué)習(xí)討論。

此示例演示了條形圖的柔性光照效果、繪圖區(qū)域背景的漸變顏色以及在軸標(biāo)簽之間放置軸刻度。
柔和的燈光是一種特殊的陰影效果,看起來(lái)像漸變色。在該示例中,柔和的照明效果被用到條行圖上,光從左邊方向發(fā)出。具體方法是:
以下代碼可在“cppdemo / softlightbar”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 360 pixels
    XYChart *c = new XYChart(600, 360);
    // Add a title to the chart using 18pt Times Bold Italic font
    c->addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18);
    // Set the plotarea at (60, 40) and of size 500 x 280 pixels. Use a vertical gradient color from
    // light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines to white
    // (ffffff).
    c->setPlotArea(60, 40, 500, 280, c->linearGradientColor(60, 40, 60, 280, 0xeeeeff, 0x0000cc),
        -1, 0xffffff, 0xffffff);
    // Add a multi-color bar chart layer using the supplied data. Use soft lighting effect with
    // light direction from left.
    c->addBarLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), IntArray(0, 0)
        )->setBorderColor(Chart::Transparent, Chart::softLighting(Chart::Left));
    // Set x axis labels using the given labels
    c->xAxis()->setLabels(StringArray(labels, (int)(sizeof(labels) / sizeof(labels[0]))));
    // Draw the ticks between label positions (instead of at label positions)
    c->xAxis()->setTickOffset(0.5);
    // Add a title to the y axis with 10pt Arial Bold font
    c->yAxis()->setTitle("USD (millions)", "arialbd.ttf", 10);
    // Set axis label style to 8pt Arial Bold
    c->xAxis()->setLabelStyle("arialbd.ttf", 8);
    c->yAxis()->setLabelStyle("arialbd.ttf", 8);
    // Set axis line width to 2 pixels
    c->xAxis()->setWidth(2);
    c->yAxis()->setWidth(2);
    // Output the chart
    c->makeChart("softlightbar.png");
    //free up resources
    delete c;
    return 0;
}

此示例演示了條形圖的玻璃著色效果、繪圖區(qū)域背景的漸變顏色以及繪圖區(qū)域兩側(cè)的軸標(biāo)簽。
玻璃型描影是一種復(fù)雜的陰影效果,可以實(shí)現(xiàn)有色玻璃或半透明塑料材料的外觀和感覺(jué)。這種效應(yīng)涉及材料內(nèi)部反射和折射引起的眩光和光照變化。具體方法如下:
以下代碼可在“cppdemo / glasslightbar”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 360 pixels
    XYChart *c = new XYChart(600, 360);
    // Set the plotarea at (60, 40) and of size 480 x 280 pixels. Use a vertical gradient color from
    // light blue (eeeeff) to deep blue (0000cc) as background. Set border and grid lines to white
    // (ffffff).
    c->setPlotArea(60, 40, 480, 280, c->linearGradientColor(60, 40, 60, 280, 0xeeeeff, 0x0000cc),
        -1, 0xffffff, 0xffffff);
    // Add a title to the chart using 18pt Times Bold Italic font
    c->addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18);
    // Add a multi-color bar chart layer using the supplied data. Use glass lighting effect with
    // light direction from the left.
    c->addBarLayer(DoubleArray(data, (int)(sizeof(data) / sizeof(data[0]))), IntArray(0, 0)
        )->setBorderColor(Chart::Transparent, Chart::glassEffect(Chart::NormalGlare, Chart::Left));
    // Set the x axis labels
    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 all axes to transparent
    c->xAxis()->setColors(Chart::Transparent);
    c->yAxis()->setColors(Chart::Transparent);
    c->yAxis2()->setColors(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("glasslightbar.png");
    //free up resources
    delete c;
    return 0;
}
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