Kontron KTAM3874-pITX - Manual (Page 148)

KTD-S0057-I Page 144 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
static void draw_cairo_object2 (XSystem sys, cairo_t *cr)
{
XColor
col;
double x = 0.0, y = 0.0,
width = OBJ_WIDTH,
height = OBJ_HEIGHT,
radius = HALF(OBJ_WIDTH);
cairo_save (cr);
cairo_arc (cr, x + radius, y + radius, radius, 0.0, 2.0 * M_PI);
cairo_clip (cr);
cairo_new_path (cr); /* current path is not consumed by cairo_clip */
XAllocNamedColor (sys.disp, sys.cmap, OBJ2_COL1, &col, &col);
cairo_set_source_rgb (cr, RGB_R (C(col)), RGB_G (C(col)), RGB_B (C(col)));
cairo_rectangle (cr, x, y, width, height);
cairo_fill (cr);
XAllocNamedColor (sys.disp, sys.cmap, OBJ2_COL2, &col, &col);
cairo_set_source_rgb (cr, RGB_R (C(col)), RGB_G (C(col)), RGB_B (C(col)));
cairo_move_to (cr, x, y);
cairo_line_to (cr, x + width, y + height);
cairo_move_to (cr, x + width, y);
cairo_line_to (cr, x, y + height);
cairo_set_line_width (cr, LINE_WIDTH);
cairo_stroke (cr);
cairo_restore (cr);
}
static void draw_cairo_object3 (XSystem sys, cairo_t *cr)
{
XColor
col;
double x = 0.0, y = 0.0,
width = OBJ_WIDTH,
height = OBJ_HEIGHT,
dashes[] = { 50.0, 10.0, 10.0, 10.0 },
offset = -dashes[0];
int ndash = sizeof (dashes) / sizeof (dashes[0]);
cairo_save (cr);
XAllocNamedColor (sys.disp, sys.cmap, OBJ3_COL, &col, &col);
cairo_set_source_rgb (cr, RGB_R (C(col)), RGB_G (C(col)), RGB_B (C(col)));
cairo_set_dash (cr, dashes, ndash, offset);
cairo_set_line_width (cr, LINE_WIDTH);
cairo_move_to (cr, x + HALF(width), y);
cairo_line_to (cr, x + width, y + height);
cairo_rel_line_to (cr, -HALF(width), 0.0);
cairo_curve_to (cr, x + QUART(width), y + height, x + QUART(width), y + HALF(height),
x + HALF(width), y + HALF(height));
cairo_stroke (cr);
cairo_restore (cr);
}