c# winform 应用编程代码总结 7

24、-在一个区域中剪辑

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            // Create a path that consists of a single polygon.
            Point[] polyPoints = {
                                     new Point(10, 10),
                                     new Point(150, 10), 
                                     new Point(100, 75),
                                     new Point(100, 150)};
            GraphicsPath path = new GraphicsPath();
            path.AddPolygon(polyPoints);

            // Construct a region based on the path.
            Region region = new Region(path);

            // Draw the outline of the region.
            Pen pen = Pens.Black;
            e.Graphics.DrawPath(pen, path);

            // Set the clipping region of the Graphics object.
            e.Graphics.SetClip(region, CombineMode.Replace);

            // Draw some clipped strings.
            FontFamily fontFamily = new FontFamily("Arial");
            Font font = new Font(
                fontFamily,
                36, FontStyle.Bold,
                GraphicsUnit.Pixel);
            SolidBrush solidBrush = new SolidBrush(Color.FromArgb(255, 255, 0, 0));
            //e.Graphics.Clip=region;
            e.Graphics.DrawString(
                "A Clipping Region",
                font, solidBrush,
                new PointF(15, 25));

            e.Graphics.DrawString(
                "A Clipping Region",
                font,
                solidBrush,
                new PointF(15, 68));
        }

        效果：

        ‍

25、使用颜色再变换表（改变图像中某种图片的颜色）

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            Image image = new Bitmap("..\\..\\test.bmp");
            int width = image.Width;
            int height = image.Height;
            e.Graphics.DrawImage(image, 10, 10, width, height);

            ColorMap colorMap = new ColorMap();
            colorMap.OldColor = Color.FromArgb(255, 255, 0, 0);  // opaque red
            colorMap.NewColor = Color.FromArgb(255, 0, 0, 255);  // opaque blue
            ColorMap[] remapTable = {colorMap};

            ImageAttributes  imageAttributes = new ImageAttributes();
            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

            e.Graphics.DrawImage(
                image, 
                new Rectangle(180, 10, width, height),  // destination rectangle
                0, 0,        // upper-left corner of source rectangle
                width,       // width of source rectangle
                height,      // height of source rectangle
                GraphicsUnit.Pixel,
                imageAttributes);        
        }

        效果：

        ‍

26、消除文本的走样现象

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            FontFamily  fontFamily = new FontFamily("Times New Roman");
            Font font = new Font( 
                fontFamily,
                32, 
                FontStyle.Regular,
                GraphicsUnit.Pixel);
            SolidBrush  solidBrush = new SolidBrush(Color.FromArgb(255, 0, 0, 255));
            string string1 = "SingleBitPerPixel";
            string string2 = "AntiAlias";

            e.Graphics.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
            e.Graphics.DrawString(string1, font, solidBrush, new PointF(10, 10));

            e.Graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
            e.Graphics.DrawString(string2, font, solidBrush, new PointF(10, 60));
        }

        效果图：

         ‍

27、绘制垂直文本

        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)

         {
            string text = "Vertical text";
            PointF pointF = new PointF(40, 10);
            FontFamily fontFamily = new FontFamily("Lucida Console");
            Font font = new Font(
                        fontFamily,
                        14,
                        FontStyle.Regular,
                        GraphicsUnit.Point);
            StringFormat stringFormat = new StringFormat();
            stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;

            SolidBrush solidBrush = new SolidBrush(Color.FromArgb(255, 0, 0, 255));
            e.Graphics.DrawString(text, font, solidBrush, pointF, stringFormat);

        }

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