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Set up a new way to specify the color used to perform a stroke or fill. GDI restrictions necessitate this.

This commit is contained in:
Pietro Gagliardi 2015-09-07 10:13:15 -04:00
parent bf4f5388d0
commit 2dc3dba97b
3 changed files with 20 additions and 28 deletions
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23
gtkarea/draw.c
View File

@ -3,7 +3,6 @@
struct uiDrawContext {
cairo_t *cr;
gboolean hasPath;
};
uiDrawContext *newContext(cairo_t *cr)
@ -12,46 +11,35 @@ uiDrawContext *newContext(cairo_t *cr)
c = (uiDrawContext *) g_malloc0(sizeof (uiDrawContext));
c->cr = cr;
c->hasPath = FALSE;
return c;
}
static void prepPath(uiDrawContext *c)
void uiDrawBeginPathRGB(uiDrawContext *c, uint8_t r, uint8_t g, uint8_t b)
{
if (c->hasPath)
return;
cairo_set_source_rgb(c->cr,
((double) r) / 255,
((double) g) / 255,
((double) b) / 255);
cairo_new_path(c->cr);
c->hasPath = TRUE;
}
void uiDrawMoveTo(uiDrawContext *c, intmax_t x, intmax_t y)
{
prepPath(c);
cairo_move_to(c->cr, (double) x + 0.5, (double) y + 0.5);
}
void uiDrawLineTo(uiDrawContext *c, intmax_t x, intmax_t y)
{
prepPath(c);
cairo_line_to(c->cr, (double) x + 0.5, (double) y + 0.5);
}
void uiDrawCloseFigure(uiDrawContext *c)
{
prepPath(c);
cairo_close_path(c->cr);
}
#define R(c) (((c) >> 16) & 0xFF)
#define G(c) (((c) >> 8) & 0xFF)
#define B(c) ((c) & 0xFF)
void uiDrawStroke(uiDrawContext *c, uiDrawStrokeParams *p)
{
cairo_set_source_rgb(c->cr,
((double) R(p->RGB)) / 255,
((double) G(p->RGB)) / 255,
((double) B(p->RGB)) / 255);
switch (p->Cap) {
case uiDrawLineCapFlat:
cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_BUTT);
@ -78,5 +66,4 @@ void uiDrawStroke(uiDrawContext *c, uiDrawStrokeParams *p)
// TODO comment the /2 here
cairo_set_line_width(c->cr, ((double) p->Thickness) / 2);
cairo_stroke(c->cr);
c->hasPath = FALSE;
}

13
gtkarea/main.c
View File

@ -16,25 +16,34 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
{
uiDrawStrokeParams sp;
uiDrawBeginPathRGB(p->Context, 0xFF, 0x00, 0x00);
uiDrawMoveTo(p->Context, p->ClipX + 5, p->ClipY + 5);
uiDrawLineTo(p->Context, (p->ClipX + p->ClipWidth) - 5, (p->ClipY + p->ClipHeight) - 5);
sp.RGB = 0xFF0000;
sp.Cap = uiDrawLineCapFlat;
sp.Join = uiDrawLineJoinMiter;
sp.Thickness = 1;
sp.MiterLimit = uiDrawDefaultMiterLimit;
uiDrawStroke(p->Context, &sp);
uiDrawBeginPathRGB(p->Context, 0x00, 0x00, 0x80);
uiDrawMoveTo(p->Context, p->ClipX, p->ClipY);
uiDrawLineTo(p->Context, p->ClipX + p->ClipWidth, p->ClipY);
uiDrawLineTo(p->Context, 50, 150);
uiDrawLineTo(p->Context, 50, 50);
uiDrawCloseFigure(p->Context);
sp.RGB = 0x000080;
sp.Cap = uiDrawLineCapFlat;
sp.Join = uiDrawLineJoinRound;
sp.Thickness = 5;
uiDrawStroke(p->Context, &sp);
uiDrawBeginPathRGB(p->Context, 0x00, 0x80, 0x00);
uiDrawMoveTo(p->Context, 5, 10);
uiDrawLineTo(p->Context, 5, 50);
sp.Cap = uiDrawLineCapFlat;
sp.Join = uiDrawLineJoinMiter;
sp.Thickness = 1;
sp.MiterLimit = uiDrawDefaultMiterLimit;
uiDrawStroke(p->Context, &sp);
}
static uintmax_t handlerHScrollMax(uiAreaHandler *a, uiArea *area)

12
gtkarea/ui.h
View File

@ -34,13 +34,10 @@ struct uiAreaDrawParams {
// TODO dotting/dashing
typedef struct uiDrawStrokeParams uiDrawStrokeParams;
typedef struct uiDrawFillParams uiDrawFillParams;
typedef enum uiDrawLineCap uiDrawLineCap;
typedef enum uiDrawLineJoin uiDrawLineJoin;
typedef enum uiDrawFillMode uiDrawFillMode;
typedef uint32_t uiRGB;
enum uiDrawLineCap {
uiDrawLineCapFlat,
uiDrawLineCapRound,
@ -67,7 +64,6 @@ enum uiDrawFillMode {
};
struct uiDrawStrokeParams {
uiRGB RGB;
uiDrawLineCap Cap;
uiDrawLineJoin Join;
intmax_t Thickness;
@ -75,15 +71,15 @@ struct uiDrawStrokeParams {
double MiterLimit;
};
struct uiDrawFillParams {
uiRGB RGB;
uiDrawFillMode FillMode;
};
void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
//TODO void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);
void uiDrawLineTo(uiDrawContext *, intmax_t, intmax_t);
void uiDrawCloseFigure(uiDrawContext *);
void uiDrawStroke(uiDrawContext *, uiDrawStrokeParams *);
//TODO void uiDrawFill(uiDrawContext *, uiDrawFillMode);
// path functions
// cairo gdi core graphics