C图形中的bar3d()函数

头文件graphics.h包含bar3d()函数，该函数用于绘制填充为bar的二维矩形。绘制条需要使用条的左上角和右下角的坐标。
句法 ：

void bar3d(int left, int top, int right, 
    int bottom, int depth, int topflag);

where,
left specifies the X-coordinate of top left corner,
top specifies the Y-coordinate of top left corner, 
right specifies the X-coordinate of right bottom corner, 
bottom specifies the Y-coordinate of right bottom corner, 
depth specifies the depth of bar in pixels, 
topflag determines whether a 3 dimensional top is put on 
the bar or not ( if it is non-zero then it is put otherwise not ).

例子 ：

输入：左侧= 150，顶部= 250，右侧= 190，底部= 350，深度= 20，topflag = 1左侧= 220，顶部= 150，右侧= 260，底部= 350，深度= 20，topflag = 0左侧= 290，顶部= 200，右侧= 330，底部= 350，深度= 20，顶部标志= 1输出：

下面是bar3d()函数：

// C Implementation for bar3d() function
#include 
  
// driver code
int main()
{
    // gm is Graphics mode which is
    // a computer display mode that
    // generates image using pixels.
    // DETECT is a macro defined in
    // "graphics.h" header file
    int gd = DETECT, gm;
  
    // initgraph initializes the
    // graphics system by loading a
    // graphics driver from disk
    initgraph(&gd, &gm, "");
  
    // location of sides
    int left, top, right, bottom;
  
    // depth of the bar
    int depth;
  
    // top flag denotes top line.
    int topflag;
  
    // left, top, right, bottom,
    // depth, topflag location's
    bar3d(left = 150, top = 250,
    right = 190, bottom = 350,
    depth = 20, topflag = 1);
  
    bar3d(left = 220, top = 150,
    right = 260, bottom = 350,
    depth = 20, topflag = 0);
  
    bar3d(left = 290, top = 200,
    right = 330, bottom = 350,
    depth = 20, topflag = 1);
  
    // y axis line
    line(100, 50, 100, 350);
  
    // x axis line
    line(100, 350, 400, 350);
  
    getch();
  
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();
  
    return 0;
}

输出：

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