C语言中的lineto()函数

头文件graphics.h包含lineto()函数，该函数绘制从当前位置到point(x，y)的线。
注意：使用getx()和gety()获取当前位置。

句法 ：

lineto(int x, int y);

where,
(x, y) are the coordinates upto which the
line will be drawn from previous point.

情况1：当点的初始位置是(0,0)

以下是lineto()函数的实现，其初始位置为原点：

// C Implementation for lineto()
#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, "");
  
    // lineto function
    lineto(250, 100);
  
    getch();
  
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();
  
    return 0;
}

输出 ：

情况2：当点的初始位置不是(0，0)

以下是lineto()函数的实现，其初始位置不是origin：

// C Implementation for lineto()
#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, "");
  
    // change initial position of point
    // with moveto function
    moveto(100, 100);
  
    // lineto function
    lineto(250, 100);
  
    getch();
  
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();
  
    return 0;
}

输出 ：

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