图片不清晰？Graphics 高质量绘制

Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                Graphics.PixelOffsetMode = PixelOffsetMode.Half;
                Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;


//设置后，用Graphic绘图就行