ProgrammingFrontendWPF

[WPF] 이미지 자르기

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사각형, 타원, 삼각형으로 이미지를 자르기 위해 다음처럼 정의합니다.

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public enum ShapeType
{
    Rectangle,
    Ellipse,
    Triangle,
}

이미지 자르기

기존 비트맵 이미지에서 주어진 위치과 크기, 도형을 통해 이미지를 자릅니다.

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public Bitmap CreateCroppedImage(Bitmap image, double left, double top, double width, double height, ShapeType shapeType)
{
    Bitmap result = new Bitmap(image.Width, image.Height);
    using (Graphics g = Graphics.FromImage(result))
    {
        RectangleF srcRect = new Rectangle((int)left, (int)top, (int)width, (int)height);

        switch (shapeType)
        {
            case ShapeType.Rectangle:
                g.DrawImage(image, new Rectangle(0, 0, result.Width, result.Height), srcRect, GraphicsUnit.Pixel);
                break;
            case ShapeType.Ellipse:
                {
                    int x = (int)width / 2;
                    int y = (int)height / 2;

                    g.SmoothingMode = SmoothingMode.AntiAlias;
                    g.TranslateTransform(result.Width / 2, result.Height / 2);
                    GraphicsPath gp = new GraphicsPath();
                    gp.AddEllipse(0 - x, 0 - y, result.Width, result.Height);
                    Region rg = new Region(gp);
                    g.SetClip(rg, CombineMode.Replace);

                    g.DrawImage(image, new Rectangle(-x, -y, result.Width, result.Height), srcRect, GraphicsUnit.Pixel);
                }
                break;
            case ShapeType.Triangle:
                {
                    float x1 = 0;
                    float y1 = 0;
                    float x2 = (float)(x1 + width);
                    float y2 = (float)(y1 + height);

                    PointF[] destPoints =
                        {
                        new PointF(x1 + (x2 - x1) / 2,  y1),
                        new PointF(x2,  y2),
                        new PointF(x1,  y2),
                    };

                    GraphicsPath gp = new GraphicsPath();
                    gp.AddPolygon(destPoints);
                    Region region = new Region(gp);
                    g.SetClip(region, CombineMode.Replace);

                    g.DrawImage(image, new Rectangle(0, 0, result.Width, result.Height), srcRect, GraphicsUnit.Pixel);
                }
                break;
        }
    }

    return result;
}

이미지 제외 나머지 부분 제거

기존 비트맵 이미지에서 주어진 위치과 크기, 도형을 통해 이미지를 제외한 나머지 부분을 제거합니다.

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public Bitmap CreateInvertCroppedImage(Bitmap image, double left, double top, double width, double height, ShapeType shapeType)
{
    Bitmap result = new Bitmap(image.Width, image.Height);
    using (Graphics g = Graphics.FromImage(result))
    {
        switch (shapeType)
        {
            case ShapeType.Rectangle:
                Rectangle rect = new Rectangle((int)left, (int)top, (int)width, (int)height);
                g.SetClip(rect, CombineMode.Exclude);
                break;
            case ShapeType.Ellipse:
                {
                    GraphicsPath gp = new GraphicsPath();
                    gp.AddEllipse((int)left, (int)top, (float)width, (float)height);
                    Region region = new Region(gp);
                    g.SetClip(region, CombineMode.Exclude);
                }
                break;
            case ShapeType.Triangle:
                {
                    float x1 = 0;
                    float y1 = 0;
                    float x2 = (float)(x1 + width);
                    float y2 = (float)(y1 + height);

                    PointF[] destPoints =
                        {
                        new PointF(x1 + (x2 - x1) / 2,  y1),
                        new PointF(x2,  y2),
                        new PointF(x1,  y2),
                    };

                    GraphicsPath gp = new GraphicsPath();
                    gp.AddPolygon(destPoints);
                    Region region = new Region(gp);
                    g.SetClip(region, CombineMode.Exclude);
                }
                break;
        }

        Rectangle destRect = new Rectangle(0, 0, result.Width, result.Height);
        Rectangle srcRect = new Rectangle(0, 0, result.Width, result.Height);

        g.DrawImage(image, destRect, srcRect, GraphicsUnit.Pixel);
    }

    return result;
}
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