C语言中的moverel（）函数-yiteyi-C++库

头文件显示图形。h包含 moverel（） 函数，将一个点从当前位置（x_pos1，y_pos1）移动到距离当前位置相对距离（x，y）的点，然后将当前位置向前移动（x，y）。注： getx 和 活泼的 可用于查找当前位置。

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语法：

moverel(int x, int y);

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

例如：

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

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

案例1： 当前位置位于原点时，即（0，0）

下面是moverel（）函数在C中的实现：

                     // C Implementation for moverel()                   
                     #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,                               ""                               );                   
                             
                                         // moverel function                   
                                         moverel(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：

案例2： 当当前位置不是原点（100150）时。

下面是moverel（）函数在C中的实现：

                     // C Implementation for moverel()                   
                     #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,                               ""                               );                   
                             
                                         // moveto function to change                   
                                         // initial position                   
                                         moveto(100, 150);                   
                             
                                         // moverel function                   
                                         moverel(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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