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、實時互動的大數據表、普遍適應于各種應用程序以及支持PDF和SVG圖標等的優點。此系列連載旨在介紹ChartDirector的實用教程，供大家學習討論。

分散的數據表面圖

此示例演示了使用曲面圖的離散數據以及如何隱藏繪圖區域墻壁并改變其厚度和顏色。

在先前的曲面圖示例中，數據是網格化的，這意味著數據點的（x，y）坐標位于矩形網格上。ChartDirector還支持分散的數據點，這意味著數據點可以位于任意位置。ChartDirector會自動檢測使用SurfaceChart.setData傳遞到曲面圖的數據是網格還是分散。

在此示例中，使用ThreeDChart.setWallVisibility隱藏3個繪圖區域墻中的2個。對于可見墻，使用ThreeDChart.setWallColor將其顏色設置為黑色時，其厚度設置為0。其主要和次要的格子線是使用ThreeDChart.setWallGrid設置為白色和灰色。

源代碼清單

以下代碼可在“cppdemo / scattersurface ”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 (x, y, z) coordinates of the scattered data
    double dataX[] = {0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9, 1.9, 4.8, 2.4,
        3.4, 7.9, 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4, 2.9, 8.9, 0.9, 8.9, 10.0, 1.0, 6.8,
        3.8, 9.0, 5.3, 6.4, 4.9, 4.5, 2.0, 5.4, 0.0, 10.0, 3.9, 5.4, 5.9, 5.8, 0.3, 4.4, 8.3};
    double dataY[] = {3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8, 4.3, 1.3, 2.3,
        5.4, 6.9, 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0, 2.9, 2.4, 3.9, 2.9, 2.3, 9.3, 2.0,
        3.4, 4.8, 2.3, 3.4, 2.3, 1.5, 7.8, 4.5, 0.9, 6.3, 2.4, 6.9, 2.8, 1.3, 2.9, 6.4, 6.3};
    double dataZ[] = {6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7, 8.4, 7.8, 8.0, 9.4,
        11.9, 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6, 9.7, 10.6, 9.2, 7.0, 6.9, 9.7, 8.6,
        8.0, 13.6, 13.2, 5.9, 9.0, 3.2, 8.3, 9.7, 8.2, 6.1, 8.7, 5.6, 14.9, 9.8, 9.3, 5.1, 10.8, 9.8
        };

    // Create a SurfaceChart object of size 680 x 550 pixels. Set background to brushed silver and
    // border to grey (888888). Set the top-left and bottom-right corners to rounded corners with 20
    // pixels radius.
    SurfaceChart *c = new SurfaceChart(680, 550, Chart::brushedSilverColor(), 0x888888);
    c->setRoundedFrame(0xffffff, 20, 0, 20, 0);

    // Add a title to the chart using 20 points Times New Roman Italic font. Set top/bottom margin
    // to 8 pixels.
    TextBox *title = c->addTitle("Surface Created Using Scattered Data Points", "timesi.ttf", 20);
    title->setMargin(0, 0, 8, 8);

    // Add a 2 pixel wide black (000000) separator line under the title
    c->addLine(10, title->getHeight(), c->getWidth() - 10, title->getHeight(), 0x000000, 2);

    // Set the center of the plot region at (290, 235), and set width x depth x height to 360 x 360
    // x 180 pixels
    c->setPlotRegion(290, 235, 360, 360, 180);

    // Set the elevation and rotation angles to 45 and -45 degrees
    c->setViewAngle(45, -45);

    // Set the perspective level to 30
    c->setPerspective(30);

    // Set the data to use to plot the chart
    c->setData(DoubleArray(dataX, (int)(sizeof(dataX) / sizeof(dataX[0]))), DoubleArray(dataY,
        (int)(sizeof(dataY) / sizeof(dataY[0]))), DoubleArray(dataZ, (int)(sizeof(dataZ) / sizeof(
        dataZ[0]))));

    // Add a color axis (the legend) in which the top right corner is anchored at (660, 80). Set the
    // length to 200 pixels and the labels on the right side.
    ColorAxis *cAxis = c->setColorAxis(660, 80, Chart::TopRight, 200, Chart::Right);

    // Set the color axis title with 12 points Arial Bold font
    cAxis->setTitle("Z Title Placeholder", "arialbd.ttf", 12);

    // Add a bounding box with light grey (eeeeee) background and grey (888888) border. Set the
    // top-left and bottom-right corners to rounded corners of  10 pixels radius.
    cAxis->setBoundingBox(0xeeeeee, 0x888888);
    cAxis->setRoundedCorners(10, 0, 10, 0);

    // Set surface grid lines to semi-transparent black (cc000000)
    c->setSurfaceAxisGrid(0xcc000000);

    // Set contour lines to semi-transparent white (80ffffff)
    c->setContourColor(0x80ffffff);

    // Set the walls to black in color
    c->setWallColor(0x000000);

    // Set the xyz major wall grid lines to white (ffffff), and minor wall grid lines to grey
    // (888888)
    c->setWallGrid(0xffffff, 0xffffff, 0xffffff, 0x888888, 0x888888, 0x888888);

    // Set the wall thickness to 0
    c->setWallThickness(0, 0, 0);

    // Show only the xy wall, and hide the yz and zx walls.
    c->setWallVisibility(true, false, false);

    // Set the x, y and z axis titles using 12 points Arial Bold font
    c->xAxis()->setTitle("X Title\nPlaceholder", "arialbd.ttf", 12);
    c->yAxis()->setTitle("Y Title\nPlaceholder", "arialbd.ttf", 12);

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

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

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