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Draw an ellipse
int PgDrawEllipse( PhPoint_t const *center,
PhPoint_t const *radii,
unsigned int flags );
int PgDrawEllipseCx( void *dc,
PhPoint_t const *center,
PhPoint_t const *radii,
unsigned int flags );
- dc
- PgDrawEllipseCx() only.
A void pointer to any type of draw context. Examples of draw contexts are:
- center
- Defines the ellipse's center.
- radii
- Defines the ellipse's x and y radii.
- flags
- Must be one of the following:
- Pg_DRAW_STROKE — draw as a line.
- Pg_DRAW_FILL — fill the ellipse.
- Pg_DRAW_FILL_STROKE — fill the ellipse,
then stroke it.
To have the function interpret the center and
radii arguments as the upper-left and lower-right
coordinates respectively, OR flags
with Pg_EXTENT_BASED.
ph
These functions build a command in the draw buffer to draw an
ellipse.
PgDrawEllipse() works on the current
draw context, while you can specify the draw context for PgDrawEllipseCx().
- 0
- Success.
- -1
- The draw buffer is too small to hold the current draw state and
the draw command.
The following example:
DrawStrokeElli() {
PhPoint_t c = { 80, 60 };
PhPoint_t r = { 72, 52 };
PgSetStrokeColor( Pg_WHITE );
PgDrawEllipse( &c, &r, Pg_DRAW_STROKE );
}
will draw:
The following example:
DrawFillElli() {
PhPoint_t c = { 80, 60 };
PhPoint_t r = { 72, 52 };
PgSetFillColor( Pg_PURPLE );
PgDrawEllipse( &c, &r, Pg_DRAW_FILL );
}
will draw:
The following example:
DrawFillStrokeElli() {
PhPoint_t c = { 80, 60 };
PhPoint_t r = { 72, 52 };
PgSetFillColor( Pg_PURPLE );
PgSetStrokeColor( Pg_WHITE );
PgDrawEllipse( &c, &r, Pg_DRAW_FILL_STROKE );
}
will draw:
Photon
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
PgDrawRoundRect*(),
PgSetFillColor*(),
PgSetFillDither*(),
PgSetFillTransPat*(),
PgSetStrokeColor*(),
PgSetStrokeDither*(),
PgSetStrokeTransPat*(),
PhPoint_t
“Arcs, ellipses, polygons, and rectangles”
in the Raw Drawing and Animation chapter of the
Photon Programmer's Guide
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