C语言 linerel()用法及代码示例

头文件graphics.h包含linerel()函数，该函数绘制一条从当前位置(x_pos1，y_pos1)到与当前位置相对距离(x，y)的点的线，然后将当前位置前进(x， y)。注意：使用getx()和gety()查找当前位置。

用法:

linerel(int x, int y);

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

例子：

Input:x_pos1 = 0, y_pos1 =0, x = 200, y = 100
Output:

Input:x_pos1 = 100, y_pos1 = 150, x = 150, y = 60
Output:

情况1：当前位置为原点时，即(0,0)
下面是C中linerel()函数的实现：

// C Implementation for linerel() 
#include <graphics.h> 
#include<stdio.h> 
  
// 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：当前位置不是原点时，为(100，150)。
下面是C中linerel()函数的实现：

// C Implementation for linerel() 
#include <graphics.h> 
#include<stdio.h> 
  
// 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：

相关用法

注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 linerel() function in C。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。