bool ZoneDiagramView::drawSvgDiagram(File &file)
{
GtkCairoContext cairo(getDiagramWidget());
SvgDrawer svgDrawer(file, cairo.getCairo());
mZoneDiagram.drawDiagram(svgDrawer);
return svgDrawer.writeFile();
}
void ZoneDiagramView::drawToDrawingArea()
{
GtkCairoContext cairo(getDiagramWidget());
CairoDrawer cairoDrawer(cairo.getCairo());
cairoDrawer.clearAndSetDefaults();
mZoneDiagram.drawDiagram(cairoDrawer);
updateDrawingAreaSize();
}
void Set(const char* c_str, const std::size_t size)
{
// create a cairo renderer
PangoCairoHandle< ::cairo_t*> cairo(
::cairo_create(_surface),
::cairo_destroy
);
// clear the surface
::cairo_save(cairo);
::cairo_set_source_rgba(cairo, 0, 0, 0, 0);
::cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
::cairo_paint(cairo);
::cairo_restore(cairo);
// if the new text string is empty, quit
if(size == 0) return;
// create a layout
PangoCairoHandle< ::PangoLayout*, ::gpointer> layout(
::pango_cairo_create_layout(cairo),
::g_object_unref
);
// set the text
::pango_layout_set_text(layout, c_str, size);
::pango_layout_set_font_description(
layout,
_font._essence->_font_desc
);
// check the required layout dimensions
int req_width = 0;
int req_height = 0;
{
::PangoRectangle ink_rect, log_rect;
::pango_layout_get_extents(
layout,
&ink_rect,
&log_rect
);
req_width = log_rect.width/PANGO_SCALE;
req_height = log_rect.height/PANGO_SCALE;
_curr_width = req_width;
}
// resize if necessary
if((_width < req_width) || (_height < req_height))
{
_width = req_width;
_height = req_height;
_surface.replace(
::cairo_image_surface_create(
CAIRO_FORMAT_A8,
_width,
_height
)
);
cairo.replace(::cairo_create(_surface));
layout.replace(::pango_cairo_create_layout(cairo));
PangoCairoDeallocateLayoutData(_parent, _data);
PangoCairoAllocateLayoutData(
_parent,
_data,
_width,
_height
);
}
int baseline = pango_layout_get_baseline(layout)/PANGO_SCALE;
_log_coords = Vec4f(
0.0f, // left bearing
GLfloat(_curr_width)/GLfloat(_height), // right bearing
GLfloat(baseline)/GLfloat(_height), // ascent
GLfloat(_height-baseline)/GLfloat(_height) // descent
);
_tex_coords = Vec4f(
0.0f, // origin x
0.0f, // origin y
_curr_width, // width
_height // height
);
// render the text
::cairo_new_path(cairo);
::cairo_move_to(cairo, 0, 0);
::cairo_set_line_width(cairo, 0.5);
::pango_cairo_update_layout(cairo, layout);
::pango_cairo_layout_path(cairo, layout);
::cairo_fill(cairo);
::cairo_surface_flush(_surface);
// update the data
PangoCairoInitializeLayoutData(
_parent,
_data,
::cairo_image_surface_get_width(_surface),
::cairo_image_surface_get_height(_surface),
::cairo_image_surface_get_data(_surface)
);
}