如何使用按鍵將圖片移動到屏幕上？

Question

我目前正在編寫一個程序，根據房子的大小在屏幕上顯示一個房子，它也會檢測到'A''S''W''D'按鍵和esc按鍵上的中斷。現在我已經獲得了所有這些功能，並借用了清晰的屏幕功能。我想將這張圖片在屏幕上上下移動。我知道我非常接近，但我不知道我應該如何去移動圖片。如果用戶按下「d」，我希望程序向右移動，我假設這將像在x座標上加1，按「a」向左移動，從x減去1，同樣向上向下，將按「w」或「s」並加上或減去y值。

#include <windows.h> 
#include <iostream> 
#include <cstdlib> 
#include <conio.h> 

using namespace std; 

void ClearScreen(); 

void draw(int j) 
{ 
    cout <<" /"; 
    for(int c=0; c<j; c++) 
    { 
     cout <<" "; 
    } 
    { 
     cout << "\\ \n"; 
    } 
    cout << " /"; 
    for(int c=0; c<j; c++) 
    { 
     cout << " "; 
    } 
    cout <<" \\ \n"; 
    cout << "/"; 
    for(int c=0; c<j; c++) 
    { 
     cout <<" "; 
    } 
    cout <<" \\ \n"; 
    cout <<"|"; 
    for(int c=0; c<j; c++) 
    { 
     cout << "----"; 
    } 
    cout <<"| \n"; 
    cout <<"|"; 
    for(int c=0; c<j; c++) 
    { 
     cout << " "; 
    } 
    cout <<"| \n"; 
    cout <<"|"; 
    for(int c=0; c<j; c++) 
    { 
     cout << " "; 
    } 
    cout <<"| \n"; 
    cout <<"|"; 
    for(int c=0; c<j; c++) 
    { 
     cout << "----"; 
    } 
    cout <<"| \n"; 
} 

///////////////////////////////// 
//////////////////////////////// 

void Move(int key,int housesize) 
{ 
    if (key ==97) 
    { 
     cout << "you pressed 'a' \n"; 
     draw(housesize); 
    } 
    else if (key==115) 
    { 
     cout<< "you pressed 's' \n \t"; 
     draw(housesize); 
    } 
    else if (key==100) 
    { 
     cout<< "you pressed 'd' \n"; 
     draw(housesize); 
    } 
    else if (key==119) 
    { 
     cout<< "you pressed 'w' \n"; 
     draw(housesize); 
    } 
} 
////// MAIN ////////////// 
int main(int argc, char *argv[]) 
{ 
    int i,number; 
    char letter; 

    cout << "How large would you like me to draw a house from 1 to 5? \n"; 
    cin >> i; 
    draw(i); 
    cout << "Press a key to move the picture and esc to close \n"; 
    while(1) 
    { 
     letter=getch(); 
     number=letter; 
     if(number==27) 
     { 
      break; 
     } 
     else if (number !=27) 
     { 
      Move(number, i); 
     } 
     ClearScreen(); 
     Move(number, i); 
    } 

    system ("PAUSE"); 
    return 0; 
} 
////// CLEARSCREEN //////////////////////////////////// 
void ClearScreen() 
{ 
    HANDLE      hStdOut; 
    CONSOLE_SCREEN_BUFFER_INFO csbi; 
    DWORD      count; 
    DWORD      cellCount; 
    COORD      homeCoords = { 0, 0 }; 

    hStdOut = GetStdHandle(STD_OUTPUT_HANDLE); 
    if (hStdOut == INVALID_HANDLE_VALUE) return; 
    /* Get the number of cells in the current buffer */ 
    if (!GetConsoleScreenBufferInfo(hStdOut, &csbi)) return; 
    cellCount = csbi.dwSize.X *csbi.dwSize.Y; 
    /* Fill the entire buffer with spaces */ 
    if (!FillConsoleOutputCharacter(
     hStdOut,(TCHAR) ' ',cellCount,homeCoords,&count)) return; 
    /* Fill the entire buffer with the current colors and attributes */ 
    if (!FillConsoleOutputAttribute(
     hStdOut,csbi.wAttributes,cellCount,homeCoords,&count)) return; 

    /* Move the cursor home */ 
    SetConsoleCursorPosition(hStdOut, homeCoords); 
} 

Answer 1

這裏缺少什麼，是你畫房子的位置。讓我們相應地更改繪圖功能：

void draw(int h, int v, int j) 
{ 
    cout << string(v, '\n'); //vertical offset 
    string hs(h,' '); // prepare horizontal offset 

    cout <<hs<< " /";  // add horizontal offset at each start of line 
    for (int c = 0; c<j; c++) { 
     cout << " "; 
    } 
    ... 
} 

現在移動只需要更改水平和垂直偏移。所以讓我們來修改這個函數。我們將通過引用傳遞這兩個如此改變調用函數的值：

void Move(int key, int& h, int& v, int housesize) 
{ 
    if (key == 'a') {  // would worth considering tolower(key) 
     if (h>1) 
      h--; 
    } 
    else if (key == 's') { 
     h++;    // is there a maximum (e.g. screensize - housewidth) ? 
    } 
    else if (key == 'd') { 
     v++; 
    } 
    else if (key == 'w') { 
     if (v>1) 
      v--; 
    } 
} 

於是最後，在main()你需要保持水平和垂直偏移，和重新設計功能使用它們：

int h = 0, v = 0; // horizontal and vertical offset 
... 
while (1) { 
    letter = getch(); 
    ... 
    else if (number != 27) { 
     Move(number, h, v, i); // <=== just change position. Will redraw later 
    } 
    ClearScreen();    
    draw(h, v, i);    // draw at new position what ever happened 
} 

Answer 2

Moves around, fluently! thankyou! 

#include <windows.h> 
#include <iostream> 
#include <cstdlib> 
#include <conio.h> 
#include <string> 
using namespace std; 
void ClearScreen(); 
void draw(int v, int h,int j) 
{ 
cout << string(v, '\n');  
string hs(h,' ');  
cout <<hs<<" /"; 
for(int c=0; c<j; c++) 
{ 
cout <<" "; 
} 
cout << "\\ \n"; 
    cout <<hs<<" /"; 
for(int c=0; c<j; c++) 
{ 
cout << " "; 
} 
cout <<" \\ \n"; 
cout <<hs<<"/"; 
for(int c=0; c<j; c++) 
{ 
    cout <<" "; 
    } 
    cout <<" \\ \n"; 
    cout <<hs<<"|"; 
    for(int c=0; c<j; c++) 
    { 
    cout << "----"; 
    } 
    cout <<"| \n"; 
    cout <<hs<<"|"; 
    for(int c=0; c<j; c++) 
    { 
    cout << " "; 
    } 
    cout <<"| \n"; 
    cout <<hs<<"|"; 
    for(int c=0; c<j; c++) 
    { 
    cout << " "; 
    } 
    cout <<"| \n"; 
    cout <<hs<<"|"; 
    for(int c=0; c<j; c++) 
    { 
    cout << "----"; 
    } 
    cout <<"|"; 
    } 
    /////////////////MOVE/////////////// 
    void Move(int key, int& h, int& v, int housesize) 
{ 
    if (key ==97) 
    {///////////////a////////// 
     if(h>1) 
     v--; 
    } 
    else if (key==115) 
    {////////////s//////////// 
    h++; 
    } 
    else if (key==100) 
    {//////////d////////////// 
    v++; 
    } 
    else if (key==119) 
    {//////////w//////////// 
     if(v>1) 
     h--; 
    } 
}  
/////////MAIN///////////////// 
int main(int argc, char *argv[]) 
{ 
int h=0, v=0; 
int i,number; 
char letter; 
cout << "How large would you like me to draw a house from 1 to 5? \n"; 
cin >> i; 
draw(h,v,i); 
cout << "Press a key to move the picture and esc to close \n"; 
while(1) 
{ 
    letter=getch(); 
    number=letter; 
    if(number==27) 
     { 
     break; 
     } 
    else if (number !=27) 
     { 
     Move(number,h,v,i); 
     } 
     ClearScreen(); 

     draw(h,v,i); 
     } 

system ("PAUSE"); 
return 0; 
} 
//////////////////////CLEARSCREAN/////////////// 
void ClearScreen() 
{ 
HANDLE      hStdOut; 
CONSOLE_SCREEN_BUFFER_INFO csbi; 
DWORD      count; 
DWORD      cellCount; 
COORD      homeCoords = { 0, 0 }; 
hStdOut = GetStdHandle(STD_OUTPUT_HANDLE); 
if (hStdOut == INVALID_HANDLE_VALUE) return; 
/* Get the number of cells in the current buffer */ 
if (!GetConsoleScreenBufferInfo(hStdOut, &csbi)) return; 
cellCount = csbi.dwSize.X *csbi.dwSize.Y; 
/* Fill the entire buffer with spaces */ 
if (!FillConsoleOutputCharacter(
hStdOut, 
(TCHAR) ' ', 
cellCount, 
homeCoords, 
&count 
)) return; 
/* Fill the entire buffer with the current colors and attributes */ 
if (!FillConsoleOutputAttribute(
hStdOut, 
csbi.wAttributes, 
cellCount, 
homeCoords, 
&count 
)) return; 

/* Move the cursor home */ 
SetConsoleCursorPosition(hStdOut, homeCoords); 
}