C语言中的linerel()函数

头文件graphics.h包含linerel()函数，该函数绘制从当前位置(x_pos1，y_pos1)到与当前位置相对距离(x，y)的点的线，然后使当前位置前进( x，y)。
注意：使用getx()和gety()查找当前位置。

句法 ：

linerel(int x, int y);

The end position is calculated as :
x_pos2 = x_pos1 + x;
y_pos2 = y_pos1 + y;

例子 ：

输入：x_pos1 = 0，y_pos1 = 0，x = 200，y = 100输出： 输入：x_pos1 = 100，y_pos1 = 150，x = 150，y = 60输出：

情况1：当当前位置在原点时，即(0,0)
下面是C语言中linerel()函数的实现：

// C Implementation for linerel()
#include 
#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;
    char arr[100];
  
    // initgraph initializes the
    // graphics system by loading a
    // graphics driver from disk
    initgraph(&gd, &gm, "");
  
    // linerel function
    linerel(200, 100);
  
    // sprintf stands for “String print”.
    // Instead of printing on console,
    // it store output on char buffer
    // which are specified in sprintf
    sprintf(arr, "Current x position = %d and "
             "y position = %d", getx(), gety());
  
    // outtext function displays
    // text at current position.
    outtextxy(100, 150, arr);
  
    getch();
  
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();
  
    return 0;
}

输出 ：

情况2：当当前位置不是原点时，为(100，150)。
下面是C语言中linerel()函数的实现：

// C Implementation for linerel()
#include 
#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;
    char arr[100];
  
    // initgraph initializes the
    // graphics system by loading a
    // graphics driver from disk
    initgraph(&gd, &gm, "");
  
    // Change current position using
    // moveto function
    moveto(100, 150);
  
    // linerel function
    linerel(150, 60);
  
    // sprintf stands for “String print”.
    // Instead of printing on console,
    // it store output on char buffer
    // which are specified in sprintf
    sprintf(arr, "Current x position = %d and "
             "y position = %d", getx(), gety());
  
    // outtext function displays
    // text at current position.
    outtextxy(100, 150, arr);
  
    getch();
  
    // closegraph function closes the
    // graphics mode and deallocates
    // all memory allocated by
    // graphics system .
    closegraph();
  
    return 0;
}

输出 ：

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