C#:繪圖問題

 

1、設定DPI

Bitmap bitmap2 = new Bitmap((int)w, (int)h);
bitmap2.SetResolution(96, 96);

2、設定Graphic（如：去鋸齒等）

        private Graphics GetG(Bitmap bitmap)
        {
            Graphics g = Graphics.FromImage(bitmap);
            //設定高質量插值法
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            //如何將圖片覆蓋到G
            g.CompositingMode = CompositingMode.SourceOver;
            //圖片呈現質量
            g.CompositingQuality = CompositingQuality.HighQuality;
            //文字抗鋸齒
            g.TextRenderingHint = TextRenderingHint.AntiAlias;
            //設定高質量,低速度呈現平滑程度
            g.SmoothingMode = SmoothingMode.AntiAlias;
            //設定背景顏色
            g.Clear(Color.White);

            return g;
        }

3、儲存繪製的圖片

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                this.pictureBox1.Image.Save(saveFileDialog1.FileName, System.Drawing.Imaging.ImageFormat.Png);
            }