控制台画图的小程序（没有写保存功能，现在看看也懒得写了）

#include <stdio.h>
#include <windows.h>
#include <conio.h>

typedef struct        
{
    int x;
    int y;
}CursorPos;

int Max_X = 0;                    // 画布行大小，为清屏做准备
int Max_Y = 0;                    // 画布列大小，为清屏做准备

void HideCursor(HANDLE hOutput);
void GotoXy(HANDLE hOutput, int x, int y);
int  GetMousePos(CursorPos *cr);
int  GetKeyPress(HANDLE hOutput, char * choice);
void ShowUsage(HANDLE hOutput);
void InitScreen(HANDLE hOutput);
void ReadFile(HANDLE hOutput);
void SaveFile(HANDLE hOutput);

int main(void)
{
    char choice=1;
    FILE * fp;                        // 打开文件
    CursorPos cursor;                // 鼠标单击的逻辑坐标
    HANDLE hOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTitle("控制台画图游戏");
    HideCursor(hOutput);
    ShowUsage(hOutput);

    if((fp=fopen("draw.txt","r"))==NULL)    // 新建文件
        fp=fopen("draw.txt","w");
    fclose(fp);

    while(1)
    {
        if(GetMousePos(&cursor))
        {
            GotoXy(hOutput, cursor.x,cursor.y);
            printf("%c",choice);
        }
        GetKeyPress(hOutput, &choice);
    }
    return 0;
}
int GetMousePos(CursorPos *cursor)
{    
    HANDLE hInput  = GetStdHandle(STD_INPUT_HANDLE); 
    INPUT_RECORD inRec;
    DWORD res;

    ReadConsoleInput(hInput, &inRec, 1, &res);
    if (inRec.EventType == MOUSE_EVENT && inRec.Event.MouseEvent.dwButtonState == FROM_LEFT_1ST_BUTTON_PRESSED) //鼠标左键
    {
        cursor->x = inRec.Event.MouseEvent.dwMousePosition.X;
        if(cursor->x > Max_X)
            Max_X = cursor->x;
        cursor->y = inRec.Event.MouseEvent.dwMousePosition.Y;
        if(cursor->y > Max_Y)
            Max_Y = cursor->y;
        
        return 1;
    }
    return 0;
}
int  GetKeyPress(HANDLE hOutput, char * choice)
{
    HANDLE hInput = GetStdHandle(STD_INPUT_HANDLE);
    INPUT_RECORD inRec;
    DWORD res;
    ReadConsoleInput(hInput, &inRec, 1, &res);

    if(inRec.EventType == KEY_EVENT)
    {
        switch(inRec.Event.KeyEvent.wVirtualKeyCode)
        {
        case VK_ESCAPE  : InitScreen(hOutput);break;
        case VK_CONTROL : ReadFile(hOutput);break;
        case VK_MENU    : SaveFile(hOutput);break;
        default :    * choice =inRec.Event.KeyEvent.uChar.AsciiChar;
        }
        return 1;
    }
    return 0;
}

void HideCursor(HANDLE hOutput)
{
    CONSOLE_CURSOR_INFO cursor_info = {1, 0};    
    SetConsoleCursorInfo(hOutput, &cursor_info);
}

/**********移动光标至(x,y)处************/
void GotoXy(HANDLE hOutput, int x, int y)
{
    COORD CursorPosd;    
    CursorPosd.X = x;
    CursorPosd.Y = y;
    SetConsoleCursorPosition(hOutput, CursorPosd);        
}

/**************显示用法*****************/
void ShowUsage(HANDLE hOutput)
{
    printf("用法：
");
    printf("一、按住键盘按键和鼠标左键可以改变笔触类型
");
    printf("二、按下 ESC 键清空屏幕
");
    printf("三、按下 CTRL 键打开文件
");
    printf("四、按下 ALT 键保存文件(尚未实现)
");
    printf("按任意键开始画图。");
    Max_X = 45;
    Max_Y = 6;
    getch();
    InitScreen(hOutput);
}

/**************清屏函数*****************/
void InitScreen(HANDLE hOutput)
{
    int i,j;
    GotoXy(hOutput, 0, 0);
    for(j=0;j<=Max_Y;j++)
    {
        for(i=0;i<=Max_X;i++)
            printf(" ");
        printf("
");
    }
    Max_X = Max_Y = 0;
}

void ReadFile(HANDLE hOutput)
{
    FILE * fp;
    char c;
    GotoXy(hOutput,0,0);
    fp=fopen("draw.txt","r");
    fscanf(fp,"%c",&c);
    printf("%c",c);
}

void SaveFile(HANDLE hOutput)
{
    FILE * fp;
    char c;
    int i,j;
    GotoXy(hOutput,0,0);
    fp=fopen("draw.txt","w");
    
    fclose(fp);
}