GUI_FillEllipse(400, 250, 400, 200);生成的图形错误

[C] 纯文本查看 复制代码
//画任意线//x0,y0:起点 x1,y1:终点//color:颜色void gui_draw_line(u16 x0,u16 y0,u16 x1,u16 y1,u16 color){u16 t; int xerr=0,yerr=0,delta_x,delta_y,distance; int incx,incy,uRow,uCol; delta_x=x1-x0; //计算坐标增量 delta_y=y1-y0; uRow=x0; uCol=y0; if(delta_x>0)incx=1; //设置单步方向 else if(delta_x==0)incx=0;//垂直线 else {incx=-1;delta_x=-delta_x;} if(delta_y>0)incy=1; else if(delta_y==0)incy=0;//水平线 else{incy=-1;delta_y=-delta_y;} if( delta_x>delta_y)distance=delta_x; //选取基本增量坐标轴 else distance=delta_y; for(t=0;t<=distance+1;t++ )//画线输出 {  gui_phy.draw_point(uRow,uCol,color);//画点 xerr+=delta_x ; yerr+=delta_y ; if(xerr>distance) { xerr-=distance; uRow+=incx; } if(yerr>distance) { yerr-=distance; uCol+=incy; } }  }//画椭圆//x0,y0:坐标//rx:x方向半径//ry:y方向半径//color:椭圆的颜色void gui_draw_ellipse(u16 x0, u16 y0, u16 rx, u16 ry,u16 color) {u32 OutConst, Sum, SumY;u16 x,y;u16 xOld;u32 _rx = rx;u32 _ry = ry;if(rx>x0||ry>y0)return;//非法.OutConst = _rx*_rx*_ry*_ry+(_rx*_rx*_ry>>1);  // Constant as explaint above // To compensate for rounding  xOld = x = rx;for (y=0; y<=ry; y++) {if (y==ry)x=0; else {SumY =((u32)(rx*rx))*((u32)(y*y)); // Does not change in loop  while(Sum = SumY + ((u32)(ry*ry))*((u32)(x*x)),(x>0) && (Sum>OutConst)) x--;}// Since we draw lines, we can not draw on the first iteration    if (y) {gui_draw_line(x0-xOld,y0-y+1,x0-x,y0-y,color);gui_draw_line(x0-xOld,y0+y-1,x0-x,y0+y,color);gui_draw_line(x0+xOld,y0-y+1,x0+x,y0-y,color);gui_draw_line(x0+xOld,y0+y-1,x0+x,y0+y,color);}xOld = x;}}

屏幕是800*480的，应该没超过吧

其他不好说，不过我倒是可以提供你一个画椭圆的函数。

什么函数？

谢谢，这个非常好，感觉比库里的用起来灵活