lcd.c

LCD快速画直线子程序

#include "constant.h"
#include "com.c"
#include "stdio.h"
//画线
void line(byte x0, byte y0, byte x1, byte y1)
{
    int dx, dy, incx, incy, inc1, inc2, e;
    byte i, x, y;
    //求水平距离
    if (x1 > x0)
    {
        dx = x1 - x0;
        incx = 1;
    }
    else
    {
        dx = x0 - x1;
        incx = -1;
    }
    //求竖直距离
    if (y1 > y0)
    {
        dy = y1 - y0;
        incy = 1;
    }
    else
    {
        dy = y0 - y1;
        incy = -1;
    }

    x = x0;
    y = y0;

    //若水平距离大于竖直距离
    if (dx > dy)
    {
        e = (dy << 1) - dx;
        inc1 = (dy - dx) << 1;
        inc2 = dy << 1;
        for (i = 0; i <= dx; i++)
        {
            pixel(x, y);
            x += incx;
            if (e < 0)
            {
                e += inc2;
            }
            else
            {
                y += incy;
                e += inc1;
            }
        }
    }
    //竖直距离大于水平距离
    else
    {
        e = (dx << 1) - dy;
        inc1 = (dx - dy) << 1;
        inc2 = dx << 1;
        for (i = 0; i <= dy; i++)
        {
            pixel(x, y);
            y += incy;
            if (e < 0)
            {
                e += inc2;
            }
            else
            {
                x += incx;
                e += inc1;
            }
        }
    }
}

void main()
{
    byte i, j;

    //    SCON  = 0x50;           /* SCON: mode 1, 8-bit UART, enable rcvr      */
    //    TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
    //    TH1   = 221;                /* TH1:  reload value for 1200 baud @ 16MHz   */
    //    TR1   = 1;                  /* TR1:  timer 1 run                          */
    //    TI    = 1;                  /* TI:   set TI to send first char of UART    */

    Init();
    FontWidth = 8;
    FontHeight = 16;
    ShowStr(30, 0, "ABCDEFFF");

    rect(0, 0, 20, 30);
    show();
    line(20, 30, 0, 0);
    show();
    while (1);
}