This article has been excerpted from book "Graphics Programming with GDI+".The Graphics class provides more than just draw and fill methods. Miscellaneous methods are defined in Table 3.6. Some of these methods are discussed in more detail later.The Clear MethodThe Clear method clears the entire drawing surface and fills it with the specified background color. It takes one argument, of type Color. To clear a form, an application passes the form's background color. The following code snippet uses the Clear method to clear a form. form.Graphics g = this.CreateGraphics(); g.Clear(this.BackColor); g.Dispose();FIGURE 3.39: Filling a polygonFIGURE 3.40: Filling rectangleTABLE 3.6: Some miscellaneous Graphics methods
AddMetafileComment
Adds a comment to a Metafile object.
Clear
Clears the entire drawing surface and fills it with the specified background color.
ExcludeClip
Updates the clip region to exclude the area specified by a Rectangle structure.
Flush
Forces execution of all pending graphics operations and returns immediate without waiting for the operations to finish.
FromHdc
Create a new Graphics object from a device context handle.
FromHwnd
Creates a new Graphics object from a window handle.
FromImage
Creates a new Graphics object from an Image object.
GetHalftonePalette
Returns a handle to the current Windows halftone palette.
GetHdc
Returns the device context handle associated with a Graphics object.
GetNearestColor
Returns the nearest color to the specified Color structure.
IntersectClip
Updates the clip region of a Graphics object to the intersection of the current clip region and a Rectangle structure.
IsVisible
Returns true if a point is within the visible clip region.
MeasureCharacterRanges
Returns an array of Region objects, each of which bounds a range of character positions within a string.
MeaureString
Measures a string when drawn with the specified Font object.
MultiplyTransform
Multiplies the world transformation and the Matrix object.
ReleaseHdc
Release a device context handle obtained by a previous call to the GetHdc method.
ResetClip
Resets the clip region to an infinite region.
ResetTransform
Resets the world transformation matrix to the identity matrix.
Restore
Restores the state of a Graphics object to the state represented by a GraphicsState object. Takes GraphicsState as input, removes the information block from the stack, and restores the Graphics object to the state it was in when it was saved.
RotateTransform
Applies rotation to the transformation matrix.
Save
Saves the information block of a Graphics object. The information block stores the state of the Graphics object. The Save method returns a GraphicsState object that identifies the information block.
ScaleTransform
Applied the specified scaling operation to the transformation matrix.
SetClip
Sets the clipping region to the Clip property.
TransformPoints
Transforms an array of points from one coordinate space to another using the current world and page transformations.
TranslateClip
Translates the clipping region by specified amounts in the horizontal and vertical directions.
TranslateTransform
Prepares the specified translation to the transformation matrix.