如何让曲线平滑，求一函数！

Question

BloodOxygen_Current := ADOT_SelectReviewData['breath'];
    Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
ADOT_SelectReviewData.Next；
我用上面的方法画出的曲线有严重的锯齿，想求一函数我只要传入Y轴坐标值就能画出一平滑的曲线，谢谢！

Answer 1

BloodOxygen_Current := ADOT_SelectReviewData['breath'];
    Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
Img_BloodOxygen.Canvas.MoveTo(x, 88-(BloodOxygen_Current));
    Img_BloodOxygen.Canvas.LineTo(x, 88);
x:=x+1;
ADOT_SelectReviewData.Next；
为什么重复画3次，难道是3条曲线？
如果是只画一条，应该是：
x := 0;//合适的数值
Img_BloodOxygen.Canvas.MoveTo(x, 88);
BloodOxygen_Current := ADOT_SelectReviewData['breath'];
    Img_BloodOxygen.Canvas.LineTo(x, 88-(BloodOxygen_Current));
x:=x+1;
ADOT_SelectReviewData.Next；

Answer 2

你还是使用GDI+吧:GPGraphics.SetSmoothingMode(SmoothingModeAntiAlias);
自己用GDI写,我感觉有点难度,原理你可以通过MSDN搜索"锯齿效果"找到.