GEOS SDK TechDocs|
| 
2.1 Dots | 
2.3 Rectangles GrDrawLine(), GrDrawLineTo(), GrDrawRelLineTo(), GrDrawHLine(), GrDrawHLineTo(), GrDrawVLine(), GrDrawVLineTo()
A line is simply a line segment that connects two points. Lines are drawn using the current line attributes stored with the GState. The new pen position becomes the last passed coordinate pair.
GrDrawLine()
draws a line between points.
GrDrawLineTo()
draws a line from the current pen position to the passed point.
GrDrawHLine()
draws a horizontal line between two points. These two points share the same
y
coordinate (thus the line is horizontal).
GrDrawHLineTo()
draws a horizontal line from the current pen position to a passed
x
coordinate.
GrDrawVLine()
draws a vertical line between two points which share a common
x
coordinate.
GrDrawVLineTo()
draws a vertical line from the current pen position to a passed
y
coordinate. The
GrDrawH...()
and
GrDrawV...()
routines save space compared to
GrDrawLine()
or
GrDrawLineTo()
, since fewer coordinates are necessary to define the line.
GrDrawRelLineTo()
draws a line from the current pen position to the point at the specified
x
and
y
offset from the starting position. This routine takes very precise coordinates, and is useful for describing paths.
GEOS SDK TechDocs|
| 2.1 Dots | 2.3 Rectangles