On (06 Jun 97) Christopher Butler wrote to All...
[ asking about what was wrong with a class he wrote ]
#include 
class GraphicsScreen {
public:
    GraphicsScreen();
    ~GraphicsScreen();
    void Box(int x1, int y1, int x2, int y2, unsigned char col);
    void PutPixel(int x, int y, unsigned char col);
};
GraphicsScreen::GraphicsScreen() {
    _asm {
        mov ax, 0x13
        int 10h
    }
}
GraphicsScreen::~GraphicsScreen() {
    _asm {
        mov ax, 3
        int 0x10
    }
}
void GraphicsScreen::PutPixel(int x, int y, unsigned char col) {
    char _far *spot = (char far *)MK_FP(0xa000, y*320+x);
    *spot = col;
}
void GraphicsScreen::Box(int x1, int y1, int x2, int y2, unsigned char col) {
    int x, y;
    char _far *spot = (char far *)MK_FP(0xa000, y2*320 + x2);
    int offset = 320 - (y2 - y1);
    for ( y = y2 - y1; y; y--) {
        for ( x = x2 - x1; x; x--)
            *spot-- = col;
        spot -= offset;
    }
}
#include 
int main(void) {
    GraphicsScreen gs;                  // Creation sets graphics mode
    gs.Box(100, 100, 200, 200, 0x13);   // Box on screen.
    gs.PutPixel(150, 150, 0x2f);        // Pixel in middle of box
    getch();                            // wait for user to press a key
}                                   // back to text mode when
                                    // automatically destroyed.
... The Universe is a figment of its own imagination.
--- PPoint 1.90
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