void gt_graphics_cairo_draw_colored_text(GtGraphics *gg, double x, double y,
GtColor color, const char *text)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && text && g->layout);
pango_layout_set_text(g->layout, text, -1);
cairo_set_source_rgb(g->cr, color.red, color.green, color.blue);
cairo_move_to(g->cr, x, y-g->font_height);
pango_cairo_show_layout(g->cr, g->layout);
}
void gt_graphics_cairo_draw_text_right(GtGraphics *gg, double x, double y,
const char *text)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
cairo_text_extents_t ext;
gt_assert(g && text);
cairo_set_source_rgb(g->cr, 0, 0, 0);
/* get text extents */
cairo_text_extents(g->cr, text, &ext);
/* draw text w/ its right end at the given coords */
cairo_move_to(g->cr, x-(ext.width)-1, y);
cairo_show_text(g->cr, text);
}
void gt_graphics_cairo_draw_text(GtGraphics *gg, double x, double y,
const char *text)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
cairo_text_extents_t ext;
gt_assert(g && text);
cairo_text_extents(g->cr, text, &ext);
if (gt_double_smaller_double(g->width, x+ext.width))
return;
cairo_set_source_rgb(g->cr, 0, 0, 0);
cairo_move_to(g->cr, x, y);
cairo_show_text(g->cr, text);
}
void gt_graphics_cairo_initialize(GtGraphics *gg, GtGraphicsOutType type,
unsigned int width, unsigned int height)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
g->outbuf = gt_str_new();
switch (type)
{
case GT_GRAPHICS_PDF:
#ifdef CAIRO_HAS_PDF_SURFACE
g->surf = cairo_pdf_surface_create_for_stream(str_write_func,
g->outbuf,
width,
height);
break;
#endif
case GT_GRAPHICS_PS:
#ifdef CAIRO_HAS_PS_SURFACE
g->surf = cairo_ps_surface_create_for_stream(str_write_func,
g->outbuf,
width,
height);
break;
#endif
case GT_GRAPHICS_SVG:
#ifdef CAIRO_HAS_SVG_SURFACE
g->surf = cairo_svg_surface_create_for_stream(str_write_func,
g->outbuf,
width,
height);
break;
#endif
case GT_GRAPHICS_PNG:
default:
g->surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
break;
}
gt_assert(g->surf && cairo_surface_status(g->surf) == CAIRO_STATUS_SUCCESS);
g->cr = cairo_create(g->surf);
gt_assert(cairo_status(g->cr) == CAIRO_STATUS_SUCCESS);
/* set background default to transparent */
g->bg_color.red = g->bg_color.green = 0.0;
g->bg_color.blue = g->bg_color.alpha = 0.0;
g->width = width;
g->height = height;
g->margin_x = g->margin_y = 20;
cairo_set_line_join(g->cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_cap(g->cr, CAIRO_LINE_CAP_ROUND);
cairo_select_font_face(g->cr, "sans-serif", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
g->type = type;
}
void gt_graphics_cairo_draw_line(GtGraphics *gg, double x, double y,
double xto, double yto, GtColor color,
double stroke_width)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
cairo_save(g->cr);
cairo_move_to(g->cr, x, rnd_to_nhalf(y));
cairo_line_to(g->cr, xto, rnd_to_nhalf(yto));
cairo_set_line_width(g->cr, stroke_width);
cairo_set_source_rgba(g->cr, color.red, color.green, color.blue, color.alpha);
cairo_stroke(g->cr);
cairo_restore(g->cr);
}
double gt_graphics_cairo_get_text_width(GtGraphics *gg, const char* text)
{
PangoRectangle rect;
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && text && g->layout);
pango_layout_set_text(g->layout, text, -1);
/* get text extents */
pango_layout_get_pixel_extents(g->layout, &rect, NULL);
gt_assert(gt_double_smaller_double(0, rect.width));
return rect.width;
}
void gt_graphics_cairo_draw_vertical_line(GtGraphics *gg, double x, double y,
GtColor color, double length,
double stroke_width)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
cairo_save(g->cr);
cairo_move_to(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y));
cairo_set_line_width(g->cr, 1);
cairo_rel_line_to(g->cr, 0, floor(length));
cairo_set_line_width(g->cr, stroke_width);
cairo_set_source_rgba(g->cr, color.red, color.green, color.blue, color.alpha);
cairo_stroke(g->cr);
cairo_restore(g->cr);
}
void gt_graphics_cairo_draw_text_clip(GtGraphics *gg, double x, double y,
const char *text)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && text);
cairo_save(g->cr);
cairo_rectangle(g->cr,
g->margin_x,
g->margin_y,
g->width-2*g->margin_x,
g->height-2*g->margin_y);
cairo_clip(g->cr);
cairo_set_source_rgb(g->cr, 0, 0, 0);
cairo_move_to(g->cr, x, y);
cairo_show_text(g->cr, text);
cairo_restore(g->cr);
}
void gt_graphics_cairo_draw_text_right(GtGraphics *gg, double x, double y,
const char *text)
{
PangoRectangle ink;
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && text && g->layout);
pango_layout_set_text(g->layout, text, -1);
/* get text extents */
pango_layout_get_pixel_extents(g->layout, &ink, NULL);
cairo_set_source_rgb(g->cr, 0, 0, 0);
/* draw text w/ its right end at the given coords */
cairo_move_to(g->cr, x-(ink.width)-1, y-g->font_height);
pango_cairo_show_layout(g->cr, g->layout);
}
void gt_graphics_cairo_set_font(GtGraphics *gg, const char *family,
FontSlant slant, FontWeight weight, double size)
{
char buf[BUFSIZ];
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && family && g->layout);
snprintf(buf, BUFSIZ, "%s %s %s %d",
family,
(slant == SLANT_ITALIC) ? "Italic" : "",
(weight == WEIGHT_BOLD) ? "Bold" : "",
(int) size);
g->desc = pango_font_description_from_string(buf);
gt_assert(g->desc);
pango_layout_set_font_description(g->layout, g->desc);
pango_font_description_free(g->desc);
g->font_height = (int) size;
}
int gt_graphics_cairo_set_background_color(GtGraphics *gg, GtColor color)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
if (g->type != GT_GRAPHICS_PNG)
{
/* blending with a background is only supported with image output type */
return -1;
}
else
{
g->bg_color.red = color.red;
g->bg_color.green = color.green;
g->bg_color.blue = color.blue;
g->bg_color.alpha = color.alpha;
return 0;
}
}
GtGraphics* gt_graphics_cairo_new(GtGraphicsOutType type,
unsigned int width,
unsigned int height)
{
GtGraphics *g;
GtGraphicsCairo *gc;
char buf[64];
g = gt_graphics_create(gt_graphics_cairo_class());
gc = gt_graphics_cairo_cast(g);
gt_graphics_cairo_initialize(g, type, width, height);
gc->layout = pango_cairo_create_layout(gc->cr);
pango_layout_set_width(gc->layout, -1);
gt_assert(gc->layout);
snprintf(buf, 64, "Sans %d", TEXT_SIZE_DEFAULT);
gc->desc = pango_font_description_from_string(buf);
pango_layout_set_font_description(gc->layout, gc->desc);
pango_font_description_free(gc->desc);
return g;
}
void gt_graphics_cairo_draw_text(GtGraphics *gg, double x, double y,
const char *text)
{
PangoRectangle ink;
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g && text && g->layout);
pango_layout_set_text(g->layout, text, -1);
/* get text extents */
pango_layout_get_pixel_extents(g->layout, &ink, NULL);
if (gt_double_smaller_double(g->width, x+ink.width))
return;
cairo_set_source_rgb(g->cr, 0, 0, 0);
cairo_move_to(g->cr, x, y-g->font_height);
pango_cairo_show_layout(g->cr, g->layout);
}
GtGraphics* gt_graphics_cairo_new_from_context(cairo_t *context,
unsigned int width,
unsigned int height)
{
GtGraphics *g;
GtGraphicsCairo *gc;
g = gt_graphics_create(gt_graphics_cairo_class());
gc = gt_graphics_cairo_cast(g);
gc->width = width;
gc->height = height;
gc->margin_x = gc->margin_y = 20;
gc->from_context = true;
gc->cr = context;
cairo_set_line_join(context, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_cap(context, CAIRO_LINE_CAP_ROUND);
cairo_select_font_face(context, "sans", CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
return g;
}
void gt_graphics_cairo_draw_curve_data(GtGraphics *gg, double x, double y,
GtColor color, double data[],
unsigned long ndata, GtRange valrange,
unsigned long height)
{
unsigned long i, rnglen;
double xpos;
GtGraphicsCairo *g;
g = gt_graphics_cairo_cast(gg);
xpos = (((double)g->width-2*g->margin_x)/((double)ndata-1));
rnglen = valrange.end - valrange.start;
cairo_save(g->cr);
cairo_move_to(g->cr,
x,
y+(1-(data[0]-valrange.start)/(double) rnglen)*height);
for (i=1;i<ndata;i++)
{
double val, pval;
if (gt_double_smaller_double(data[i], valrange.start)
|| gt_double_smaller_double(valrange.end, data[i]))
break;
val = (double) (data[i]-valrange.start)/(double) rnglen;
pval = (double) (data[i-1]-valrange.start)/(double) rnglen;
gt_assert(val <= 1 && val >= 0 && pval >= 0 && pval <= 1);
cairo_curve_to(g->cr,
x + ((i-0.5) * xpos),
y + (1-pval) * height,
x + ((i-0.5) * xpos),
y + (1-val) * height,
x + (i * xpos),
y + (1-val) * height);
}
cairo_set_source_rgba(g->cr, color.red,
color.green,
color.blue,
color.alpha);
cairo_stroke(g->cr);
cairo_restore(g->cr);
}
void gt_graphics_cairo_draw_arrowhead(GtGraphics *gg, double x, double y,
GtColor color, ArrowStatus arrow_status)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
double arrow_height = 8, arrow_width = 5;
gt_assert(g);
/* save cairo context */
cairo_save(g->cr);
cairo_reset_clip(g->cr);
cairo_set_source_rgb(g->cr, color.red, color.green, color.blue);
switch (arrow_status)
{
case ARROW_LEFT:
cairo_move_to(g->cr, x+arrow_width, y);
cairo_line_to(g->cr, x, y+(arrow_height/2));
cairo_line_to(g->cr, x+arrow_width, y+arrow_height);
cairo_close_path(g->cr);
/* fill area */
cairo_fill_preserve(g->cr);
cairo_stroke(g->cr);
break;
case ARROW_RIGHT:
cairo_move_to(g->cr, x, y);
cairo_line_to(g->cr, x+arrow_width, y+(arrow_height/2));
cairo_line_to(g->cr, x, y+arrow_height);
cairo_close_path(g->cr);
/* fill area */
cairo_fill_preserve(g->cr);
cairo_stroke(g->cr);
break;
case ARROW_BOTH: /* XXX */
case ARROW_NONE: break;
}
/* restore cairo context */
cairo_restore(g->cr);
}
double gt_graphics_cairo_get_image_width(GtGraphics *gg)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
return g->width;
}
double gt_graphics_cairo_get_image_height(GtGraphics *gg)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
return g->height;
}
double gt_graphics_cairo_get_ymargins(GtGraphics *gg)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
gt_assert(g);
return g->margin_y;
}
void gt_graphics_cairo_draw_box(GtGraphics *gg, double x, double y,
double width, double height,
GtColor fill_color, ArrowStatus arrow_status,
double arrow_width, double stroke_width,
GtColor stroke_color, bool dashed)
{
GtGraphicsCairo *g = gt_graphics_cairo_cast(gg);
double dashes[]={2.0};
bool widthdiff_geq0;
gt_assert(g);
/* save cairo context */
cairo_save(g->cr);
cairo_rectangle(g->cr, rnd_to_nhalf(g->margin_x), g->margin_y,
rnd_to_nhalf(g->width-2*g->margin_x),
g->height-2*g->margin_y);
cairo_clip(g->cr);
widthdiff_geq0 = gt_double_smaller_double(0, width - arrow_width);
/* construct shape of the box or arrow */
switch (arrow_status)
{
case ARROW_RIGHT:
cairo_move_to(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y));
if (widthdiff_geq0)
cairo_line_to(g->cr, x + width - arrow_width, rnd_to_nhalf(y));
cairo_line_to(g->cr, rnd_to_nhalf(x + width),
rnd_to_nhalf(y + height / 2));
if (widthdiff_geq0)
cairo_line_to(g->cr, x + width - arrow_width, rnd_to_nhalf(y + height));
cairo_line_to(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y + height));
cairo_close_path(g->cr);
break;
case ARROW_LEFT:
cairo_move_to(g->cr, rnd_to_nhalf(x + width), rnd_to_nhalf(y));
if (widthdiff_geq0) {
cairo_line_to(g->cr, rnd_to_nhalf(x + arrow_width), rnd_to_nhalf(y));
}
cairo_line_to(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y + height / 2));
if (widthdiff_geq0) {
cairo_line_to(g->cr, rnd_to_nhalf(x + arrow_width),
rnd_to_nhalf(y + height));
}
cairo_line_to(g->cr, rnd_to_nhalf(x + width), rnd_to_nhalf(y + height));
cairo_close_path(g->cr);
break;
case ARROW_BOTH:
cairo_move_to(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y + height/2));
if (gt_double_smaller_double(width, 2*arrow_width))
{
cairo_line_to(g->cr, rnd_to_nhalf(x + width/2), rnd_to_nhalf(y));
cairo_line_to(g->cr, rnd_to_nhalf(x + width),
rnd_to_nhalf(y + height/2));
cairo_line_to(g->cr, rnd_to_nhalf(x + width/2),
rnd_to_nhalf(y + height));
}
else
{
cairo_line_to(g->cr, rnd_to_nhalf(x + arrow_width), rnd_to_nhalf(y));
cairo_line_to(g->cr, rnd_to_nhalf(x + width - arrow_width),
rnd_to_nhalf(y));
cairo_line_to(g->cr, rnd_to_nhalf(x + width),
rnd_to_nhalf(y + height/2));
cairo_line_to(g->cr, rnd_to_nhalf(x + width - arrow_width),
rnd_to_nhalf(y + height));
cairo_line_to(g->cr, rnd_to_nhalf(x + arrow_width), y + height);
}
cairo_close_path(g->cr);
break;
case ARROW_NONE:
cairo_rectangle(g->cr, rnd_to_nhalf(x), rnd_to_nhalf(y), width, height);
}
/* fill area */
cairo_set_source_rgba(g->cr, fill_color.red,
fill_color.green,
fill_color.blue,
fill_color.alpha);
cairo_fill_preserve(g->cr);
/* draw outline */
cairo_set_line_width(g->cr, stroke_width);
cairo_set_source_rgba(g->cr, stroke_color.red,
stroke_color.green,
stroke_color.blue,
stroke_color.alpha);
if (dashed)
cairo_set_dash(g->cr, dashes, 1, (double) 0);
cairo_stroke(g->cr);
/* restore cairo context */
cairo_restore(g->cr);
}
