GtCanvas* gt_canvas_cairo_context_new(GtStyle *style, cairo_t *context,
double offsetpos,
unsigned long width,
unsigned long height,
GtImageInfo *image_info,
GtError *err)
{
GtCanvas *canvas;
GtCanvasCairoContext *ccc;
double margins = 10.0;
gt_assert(style && width > 0 && height > 0);
if (gt_style_get_num(style,
"format", "margins", &margins,
NULL, err) == GT_STYLE_QUERY_ERROR) {
return NULL;
}
canvas = gt_canvas_create(gt_canvas_cairo_context_class());
canvas->pvt->y += offsetpos;
canvas->pvt->g = gt_graphics_cairo_new_from_context(context,
width,
height+offsetpos);
gt_graphics_set_margins(canvas->pvt->g, margins, 0);
canvas->pvt->margins = margins;
if (image_info)
gt_image_info_set_height(image_info, height);
canvas->pvt->sty = style;
canvas->pvt->y += 0.5;
canvas->pvt->ii = image_info;
canvas->pvt->width = width;
canvas->pvt->height = height;
canvas->pvt->bt = NULL;
ccc = canvas_cairo_context_cast(canvas);
ccc->context = context;
return canvas;
}
GtCanvas* gt_canvas_cairo_file_new(GtStyle *style,
GtGraphicsOutType output_type,
GtUword width, GtUword height,
GtImageInfo *image_info,
GtError *err)
{
GtCanvas *canvas;
GtColor bgcolor = {1.0, 1.0, 1.0, 1.0};
GtCanvasCairoFile *ccf;
GtStyleQueryStatus status;
double margins = 10.0;
gt_assert(style && width > 0 && height > 0);
status = gt_style_get_color(style, "format", "background_color", &bgcolor,
NULL, err);
switch (status) {
case GT_STYLE_QUERY_ERROR:
return NULL;
case GT_STYLE_QUERY_NOT_SET:
bgcolor.red = bgcolor.green = bgcolor.blue = bgcolor.alpha = 1.0;
break;
default:
break;
}
if (gt_style_get_num(style,
"format", "margins", &margins,
NULL, err) == GT_STYLE_QUERY_ERROR) {
return NULL;
}
canvas = gt_canvas_create(gt_canvas_cairo_file_class());
canvas->pvt->g = gt_graphics_cairo_new(output_type, width, height);
(void) gt_graphics_set_background_color(canvas->pvt->g, bgcolor);
(void) gt_graphics_set_margins(canvas->pvt->g, margins, 0);
canvas->pvt->margins = margins;
if (image_info)
gt_image_info_set_height(image_info, height);
canvas->pvt->sty = style;
canvas->pvt->y += 0.5;
canvas->pvt->ii = image_info;
canvas->pvt->width = width;
canvas->pvt->height = height;
canvas->pvt->bt = NULL;
ccf = canvas_cairo_file_cast(canvas);
ccf->type = output_type;
return canvas;
}
