C# 4 and .NET 4

OC22 ❘ ChaPTer 48 GrAphics with Gdi+
color or a brush, and additionally a float, which represents the width of the pen. (It needs to be a float in
case you are using non-default units such as millimeters or inches for the Graphics object that will do the
drawing, so you can, for example, specify fractions of an inch.) For example, you can construct pens similar
to this:
Brush brickBrush = new HatchBrush(HatchStyle.DiagonalBrick,
Color.DarkGoldenrod, Color.Cyan);
Pen solidBluePen = new Pen(Color.FromArgb(0,0,255));
Pen solidWideBluePen = new Pen(Color.Blue, 4);
Pen brickPen = new Pen(brickBrush);
Pen brickWidePen = new Pen(brickBrush, 10);
Additionally, a fourth way offers the quick construction of pens by using the class System.Drawing.Pens,
which, like the Brushes class, contains a number of stock pens. These pens all have a 1-pixel width and
come in the usual sets of web-safe colors. This allows you to construct pens in this way:
Pen solidYellowPen = Pens.Yellow;
draWing shaPes and lines
You have almost finished the first part of the chapter, and you have seen all the basic classes and objects
required to draw specified shapes and so on to the screen. This section starts by reviewing some of the
drawing methods the Graphics class makes available and presents a short example that illustrates the use
of several brushes and pens.
System.Drawing.Graphics has a large number of methods that allow you to draw various lines, outline
shapes, and solid shapes. Again, there are too many to provide a comprehensive list here, but the following
table lists the main ones and should give you some idea of the variety of shapes you can draw.
meThod TyPiCal ParameTers WhaT iT draWs
DrawLine Pen, start and end points A single straight line.
DrawRectangle Pen, position, and size Outline of a rectangle.
DrawEllipse Pen, position, and size Outline of an ellipse.
FillRectangle Brush, position, and size Solid rectangle.
FillEllipse Brush, position, and size Solid ellipse.
DrawLines Pen, array of points Series of lines, connecting each point to the next
one in the array.
DrawBezier Pen, four points A smooth curve through the two endpoints, with
the remaining two points used to control the shape
of the curve.
DrawCurve Pen, array of points A smooth curve through the points.
DrawArc Pen, rectangle, two angles Portion of circle within the rectangle defined by
the angles.
DrawClosedCurve Pen, array of points Like DrawCurve but also draws a straight line to
close the curve.
DrawPie Pen, rectangle, two angles Wedge-shaped outline within the rectangle.
FillPie Brush, rectangle, two angles Solid wedge-shaped area within the rectangle.
DrawPolygon Pen, array of points Like DrawLines but also connects first and last
points to close the figure drawn.
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