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More drawing API work.

This commit is contained in:
Pietro Gagliardi 2015-09-07 19:29:42 -04:00
parent cd215c260c
commit c37d81cb06
3 changed files with 28 additions and 3 deletions
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17
gtkarea/draw.c
View File

@ -35,17 +35,17 @@ void uiDrawBeginPathRGBA(uiDrawContext *c, uint8_t r, uint8_t g, uint8_t b, uint
void uiDrawMoveTo(uiDrawContext *c, intmax_t x, intmax_t y)
{
cairo_move_to(c->cr, (double) x + 0.5, (double) y + 0.5);
cairo_move_to(c->cr, ((double) x) + 0.5, ((double) y) + 0.5);
}
void uiDrawLineTo(uiDrawContext *c, intmax_t x, intmax_t y)
{
cairo_line_to(c->cr, (double) x + 0.5, (double) y + 0.5);
cairo_line_to(c->cr, ((double) x) + 0.5, ((double) y) + 0.5);
}
void uiDrawRectangle(uiDrawContext *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height)
{
cairo_rectangle(c->cr, (double) x + 0.5, (double) y + 0.5, width, height);
cairo_rectangle(c->cr, ((double) x) + 0.5, ((double) y) + 0.5, width, height);
}
void uiDrawArc(uiDrawContext *c, intmax_t xCenter, intmax_t yCenter, intmax_t radius, double startAngle, double endAngle, int lineFromCurrentPointToStart)
@ -62,6 +62,17 @@ void uiDrawArc(uiDrawContext *c, intmax_t xCenter, intmax_t yCenter, intmax_t ra
startAngle);
}
void uiDrawBezierTo(uiDrawContext *c, intmax_t c1x, intmax_t c1y, intmax_t c2x, intmax_t c2y, intmax_t endX, intmax_t endY)
{
cairo_curve_to(c->cr,
((double) c1x) + 0.5,
((double) c1y) + 0.5,
((double) c2x) + 0.5,
((double) c2y) + 0.5,
((double) endX) + 0.5,
((double) endY) + 0.5);
}
void uiDrawCloseFigure(uiDrawContext *c)
{
cairo_close_path(c->cr);

12
gtkarea/main.c
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@ -75,6 +75,18 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
sp.Thickness = 1;
sp.MiterLimit = uiDrawDefaultMiterLimit;
uiDrawStroke(p->Context, &sp);
uiDrawBeginPathRGB(p->Context, 0x00, 0x80, 0xC0);
uiDrawMoveTo(p->Context, 300, 300);
uiDrawBezierTo(p->Context,
350, 320,
310, 390,
435, 372);
sp.Cap = uiDrawLineCapFlat;
sp.Join = uiDrawLineJoinMiter;
sp.Thickness = 1;
sp.MiterLimit = uiDrawDefaultMiterLimit;
uiDrawStroke(p->Context, &sp);
}
static uintmax_t handlerHScrollMax(uiAreaHandler *a, uiArea *area)

2
gtkarea/ui.h
View File

@ -80,6 +80,8 @@ void uiDrawLineTo(uiDrawContext *, intmax_t, intmax_t);
void uiDrawRectangle(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t);
// notes: angles are both relative to 0 and go counterclockwise
void uiDrawArc(uiDrawContext *, intmax_t, intmax_t, intmax_t, double, double, int);
// TODO behavior when there is no initial point on Windows and OS X
void uiDrawBezierTo(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t);
void uiDrawCloseFigure(uiDrawContext *);
void uiDrawStroke(uiDrawContext *, uiDrawStrokeParams *);