using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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namespace HotelPms.Share.Windows.GraphicsApi
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{
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/// <summary>
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/// UTF8中文转码
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/// </summary>
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public static class GdiPlus
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{
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/// <summary>
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/// 等比缩放图片，画到目标区域
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/// </summary>
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/// <param name="g"></param>
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/// <param name="img"></param>
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/// <param name="tagRect"></param>
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public static void DrawImage(Graphics g, Bitmap img, Rectangle tagRect)
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{
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int width = tagRect.Width;
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int height = tagRect.Height;
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//Zoom
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if ((double)img.Width / (double)tagRect.Width < (double)img.Height / (double)tagRect.Height) // image is wider
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{
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//例1： img(w=100,h=100) → tag(w=10,h=5) w缩小10倍，h缩小20倍 → 全体缩小20倍 → w=5,h=5
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width = (int)((double)img.Width / ((double)img.Height / (double)tagRect.Height));
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}
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else
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{
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//例2： img(w=100,h=100) → tag(w=100,h=500) w缩小1倍，h缩小0.5倍 → 全体缩小1倍 → w=100,h=100
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height = (int)((double)img.Height / (double)img.Width * (double)tagRect.Width);
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}
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//居中
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Rectangle imgRect = new Rectangle(tagRect.X, tagRect.Y, width, height);
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ImageAttributes vAttr = new ImageAttributes();
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vAttr.SetColorKey(img.GetPixel(0, 0), img.GetPixel(0, 0));
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g.DrawImage(img, imgRect, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, vAttr);
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}
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public static void FillRectangle(Graphics g, Color color, RectangleF rect)
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{
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bool newflag = color.IsSystemColor;
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SolidBrush brush = newflag ? SystemBrushes.FromSystemColor(color) as SolidBrush : new SolidBrush(color);
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g.FillRectangle(brush, rect);
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if (!newflag) { brush.Dispose(); }
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}
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/// <summary>
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/// 円角長方形
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/// </summary>
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/// <param name="g"></param>
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/// <param name="pen"></param>
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/// <param name="rect"></param>
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/// <param name="cornerRadius"></param>
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public static void DrawRoundRectangle(Graphics g, Pen pen, RectangleF rect, int cornerRadius)
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{
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using (GraphicsPath path = CreateRoundedRectanglePath(rect, cornerRadius))
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{
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g.SmoothingMode = SmoothingMode.AntiAlias; //使绘图质量最高，即消除锯齿
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//g.InterpolationMode = InterpolationMode.HighQualityBicubic; //要らない！！！
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//g.CompositingQuality = CompositingQuality.HighQuality; //要らない！！！
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g.DrawPath(pen, path);
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g.SmoothingMode = SmoothingMode.Default;
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//g.InterpolationMode = InterpolationMode.Default; //要らない！！！
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///g.CompositingQuality = CompositingQuality.Default; //要らない！！！
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}
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}
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/// <summary>
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/// 円角長方形
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/// </summary>
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/// <param name="g"></param>
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/// <param name="brush"></param>
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/// <param name="rect"></param>
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/// <param name="cornerRadius"></param>
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public static void FillRoundRectangle(Graphics g, Brush brush, RectangleF rect, int cornerRadius)
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{
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using (GraphicsPath path = CreateRoundedRectanglePath(rect, cornerRadius))
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{
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g.SmoothingMode = SmoothingMode.AntiAlias; //使绘图质量最高，即消除锯齿
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//g.InterpolationMode = InterpolationMode.HighQualityBicubic; //要らない！！！
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//g.CompositingQuality = CompositingQuality.HighQuality; //要らない！！！
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g.FillPath(brush, path);
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g.SmoothingMode = SmoothingMode.Default;
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//g.InterpolationMode = InterpolationMode.Default; //要らない！！！
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//g.CompositingQuality = CompositingQuality.Default; //要らない！！！
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}
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}
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/// <summary>
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///角丸長方形のGraphicsPathを作成します。
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/// </summary>
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/// <param name="rect">長方形</param>
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/// <param name="radius">角丸の半径</param>
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/// <param name="leftTop">左上は角丸:true 直角:false</param>
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/// <param name="rightYop">右上は角丸:true 直角:false</param>
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/// <param name="rightBottom">右下は角丸:true 直角:false</param>
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/// <param name="leftBottom">左下は角丸:true 直角:false</param>
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/// <returns></returns>
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public static GraphicsPath GetRoundRect(RectangleF rect, float radius, bool leftTop, bool rightYop, bool rightBottom, bool leftBottom)
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{
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GraphicsPath path = new GraphicsPath();
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path.StartFigure();
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// 左上の角丸(※枠は正方形、枠の中心は円心)
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if (leftTop) { path.AddArc(rect.Left, rect.Top, radius * 2, radius * 2, 180, 90); }
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// 上の線
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path.AddLine(rect.Left + (leftTop ? radius : 0), rect.Top, rect.Right - (rightYop ? radius : 0), rect.Top);
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// 右上の角丸
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if (rightYop) { path.AddArc(rect.Right - radius * 2, rect.Top, radius * 2, radius * 2, 270, 90); }
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// 右の線
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path.AddLine(rect.Right, rect.Top + (rightYop ? radius : 0), rect.Right, rect.Bottom - (rightBottom ? radius : 0));
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// 右下の角丸
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if (rightBottom) { path.AddArc(rect.Right - radius * 2, rect.Bottom - radius * 2, radius * 2, radius * 2, 0, 90); }
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// 下の線
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path.AddLine(rect.Right - (rightBottom ? radius : 0), rect.Bottom, rect.Left + (leftBottom ? radius : 0), rect.Bottom);
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// 左下の角丸
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if (leftBottom) { path.AddArc(rect.Left, rect.Bottom - radius * 2, radius * 2, radius * 2, 90, 90); }
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// 左の線
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path.AddLine(rect.Left, rect.Bottom - (leftBottom ? radius : 0), rect.Left, rect.Top + (leftTop ? radius : 0));
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path.CloseFigure();
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return path;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="rect"></param>
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/// <param name="cornerRadius">角丸の半径</param>
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/// <returns></returns>
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public static GraphicsPath CreateRoundedRectanglePath(RectangleF rect, int cornerRadius)
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{
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GraphicsPath Rect = new GraphicsPath();
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Rect.StartFigure();
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Rect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);
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Rect.AddArc(rect.X + rect.Width - cornerRadius * 2 - 1, rect.Y, cornerRadius * 2, cornerRadius * 2, -90, 90);
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Rect.AddArc(rect.X + rect.Width - cornerRadius * 2 - 1, rect.Y + rect.Height - cornerRadius * 2 - 1, cornerRadius * 2, cornerRadius * 2, 0, 90);
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Rect.AddArc(rect.X, rect.Bottom - cornerRadius * 2 - 1, cornerRadius * 2, cornerRadius * 2, 90, 90);
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Rect.CloseFigure();
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return Rect;
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}
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/// <summary>
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/// 対象画像の目標領域より丸い画像を切り出し
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/// </summary>
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/// <param name="img">対象画像</param>
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/// <param name="rec">対象画像の目標領域</param>
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/// <param name="size">必要な画像サイズ</param>
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/// <returns></returns>
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public static Image CutEllipse(Image img, Rectangle rec, Size size)
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{
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Bitmap bitmap = new Bitmap(size.Width, size.Height);
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using (Graphics g = Graphics.FromImage(bitmap))
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{
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using (TextureBrush br = new TextureBrush(img, System.Drawing.Drawing2D.WrapMode.Clamp, rec))
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{
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br.ScaleTransform(bitmap.Width / (float)rec.Width, bitmap.Height / (float)rec.Height);
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g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
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g.FillEllipse(br, new Rectangle(Point.Empty, size));
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}
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}
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return bitmap;
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}
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}
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}
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