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(shí)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(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。

分散的數(shù)據(jù)表面圖

此示例演示了使用曲面圖的離散數(shù)據(jù)以及如何隱藏繪圖區(qū)域墻壁并改變其厚度和顏色。

在先前的曲面圖示例中，數(shù)據(jù)是網(wǎng)格化的，這意味著數(shù)據(jù)點(diǎn)的（x，y）坐標(biāo)位于矩形網(wǎng)格上。ChartDirector還支持分散的數(shù)據(jù)點(diǎn)，這意味著數(shù)據(jù)點(diǎn)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(shù)據(jù)是網(wǎng)格還是分散。

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