LCD画直线函数的问题

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楼主

冰糖炖雪梨|

楼主 | 2018-7-3 18:10 | 只看该作者回帖奖励

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函数, LCD, point, se, ABS

void LCD_Line(u16 x1, u16 y1, u16 x2, u16 y2)
{
u16 x, y, t;
  Set_direction(0);
if( (x1 == x2) && (y1 == y2) )
      LCD_Point(x1, y1);
else if( abs(y2 - y1) > abs(x2 - x1) ) /*斜率大于1*/
{
  if(y1 > y2)
      {
         t = y1;
         y1 = y2;
         y2 = t;
         t = x1;
         x1 = x2;
         x2 = t;
      }
      for(y=y1; y<y2; y++)    /*以y轴为基准*/
      {
         x = (u32)(y-y1)*(x2-x1) / (y2-y1) + x1;
         LCD_Point(x, y);
      }
}
else             /*斜率小于等于1*/
{
      if(x1 > x2)
      {
         t = y1;
         y1 = y2;
         y2 = t;
         t = x1;
         x1 = x2;
         x2 = t;
      }
      for(x=x1; x<x2; x++)       /*以x轴为基准*/
      {
         y = (u32)(x-x1)*(y2-y1) / (x2-x1) + y1; ？？？？？？？？？？？？？？？？？？？？
         LCD_Point(x, y);
      }
}
}             以X轴为基准y = (u32)(x-x1)*(y2-y1) / (x2-x1) + y1  是不是应该为y = (u32)(x+x1)*(y2-y1) / (x2-x1) + y1;

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