Line and Curve Attributes
A device context (DC) contains attributes that affect line and curve output.
The
line and curve attributes include the current position, brush style, brush color, pen style, pen color,
transformation, and so on.
The default current position for any DC is located at the point (0,0) in
logical (or world) space. You can set these coordinates to a new position by calling
the
MoveToEx function and passing a new set of coordinates.
Note Windows provides two sets of line- and curve-drawing functions. The first
set retains the current position in a DC, and the second set alters the position.
You can identify the functions that alter the current position by examining
the function name. If the function name ends with the preposition "To", the
function sets the current position to the ending point of the last line drawn (
LineTo,
ArcTo,
PolylineTo, or
PolyBezierTo). If the function name does not end with this preposition, it leaves the
current position intact (
Arc,
Polyline, or
PolyBezier).
The default brush is a solid white brush. An application can create a new
brush by calling the
CreateBrushIndirect function. After creating a brush, the application can select it into its DC
by calling the
SelectObject function. Windows provides a complete set of functions to create, select, and
alter the brush in an application's DC. For more information about these
functions and about brushes in general, see
Brushes.
The default pen is a cosmetic, solid black pen that is one pixel wide. An
application can create a pen by using the
ExtCreatePen function. After creating a pen, your application can select it into its DC by
calling the
SelectObject function. Windows provides a complete set of functions to create, select, and
alter the pen in an application's DC. For more information about these
functions and about pens in general, see
Pens.
The default transformation is the unity transformation (specified by the
identity matrix). An application can specify a new transformation by calling the
SetWorldTransform function. Windows provides a complete set of functions to transform lines and
curves by altering their width, location, and general appearance. For more
information about these functions, see
Coordinate Spaces and Transformations.
- Software for developers
-
Delphi Components
.Net Components
Software for Android Developers
- More information resources
-
MegaDetailed.Net
Unix Manual Pages
Delphi Examples
- Databases for Amazon shops developers
-
Amazon Categories Database
Browse Nodes Database
