C# TextLayout.SetBackgound方法代码示例

//.........这里部分代码省略.........

            // proofing scale, on second col
            ctx.Save ();
            ctx.SetColor (Colors.Red);
            col2.Left = col1.Right + 10;

            text.Text = "eirmod tempor invidunt ut.";

            var scale = 1.2;
            text.Width = text.Width / scale;
            var size3 = text.GetSize ();
            col2.Height = size3.Height * scale;
            col2.Width = size3.Width * scale + 5;
            ctx.Scale (scale, scale);
            ctx.DrawTextLayout (text, col2.Left / scale, col2.Top / scale);
            ctx.Restore ();

            // proofing heigth, on second col
            ctx.Save ();
            ctx.SetColor (Colors.DarkCyan);
            text.Text = "Praesent ac lacus nec dolor pulvinar feugiat a id elit.";
            var size4 = text.GetSize ();
            text.Height = size4.Height / 2;
            text.Trimming=TextTrimming.WordElipsis;
            ctx.DrawTextLayout (text, col2.Left, col2.Bottom + 5);

            ctx.SetLineWidth (1);
            ctx.SetColor (Colors.Blue);
            ctx.Rectangle (new Rectangle (col2.Left, col2.Bottom + 5, text.Width, text.Height));
            ctx.Stroke();
            ctx.Restore ();

            // drawing col line
            ctx.SetLineWidth (1);

            ctx.SetColor (Colors.Black.WithAlpha (.5));
            ctx.MoveTo (col1.Right + 5, col1.Top);
            ctx.LineTo (col1.Right + 5, col1.Bottom);
            ctx.Stroke ();
            ctx.MoveTo (col2.Right + 5, col2.Top);
            ctx.LineTo (col2.Right + 5, col2.Bottom);
            ctx.Stroke ();
            ctx.SetColor (Colors.Black);

            // proofing rotate, and printing size to see the values
            ctx.Save ();

            text.Font = this.Font.WithSize (10);
            text.Text = string.Format ("Size 1 {0}\r\nSize 2 {1}\r\nSize 3 {2} Scale {3}",
                                       size1, size2, size3, scale);
            text.Width = -1; // this clears textsize
            text.Height = -1;
            ctx.Rotate (5);
            // maybe someone knows a formula with angle and textsize to calculyte ty
            var ty = 30;
            ctx.DrawTextLayout (text, ty, col1.Bottom + 10);

            ctx.Restore ();

            // scale example here:

            ctx.Restore ();

            TextLayout tl0 = new TextLayout (this);

            tl0.Font = this.Font.WithSize (10);
            tl0.Text = "This text contains attributes.";
            tl0.SetUnderline ( 0, "This".Length);
            tl0.SetForeground (new Color (0, 1.0, 1.0), "This ".Length, "text".Length);
            tl0.SetBackgound (new Color (0, 0, 0), "This ".Length, "text".Length);
            tl0.SetFontWeight (FontWeight.Bold, "This text ".Length, "contains".Length);
            tl0.SetFontStyle (FontStyle.Italic, "This text ".Length, "contains".Length);
            tl0.SetStrikethrough ("This text contains ".Length, "attributes".Length);

            ctx.DrawTextLayout (tl0, col2.Left, col2.Bottom + 100);

            // Text boces

            y = 180;

            // Without wrapping

            TextLayout tl = new TextLayout (this);
            tl.Text = "Stright text";
            DrawText (ctx, tl, ref y);

            // With wrapping

            tl = new TextLayout (this);
            tl.Text = "The quick brown fox jumps over the lazy dog";
            tl.Width = 100;
            DrawText (ctx, tl, ref y);

            // With blank lines

            tl = new TextLayout (this);
            tl.Text = "\nEmpty line above\nLine break above\n\nEmpty line above\n\n\nTwo empty lines above\nEmpty line below\n";
            tl.Width = 200;
            DrawText (ctx, tl, ref y);
        }

 internal override void Apply(TextLayout la)
 {
     la.SetBackgound (Color, StartIndex, Count);
 }