*
* demo-item.c - a simple demo item.
*/
+#include <math.h>
+
#include "goocanvas.h"
#include "demo-item.h"
static void
goo_demo_item_init (GooDemoItem *demo_item)
{
- demo_item->x = 0.0;
- demo_item->y = 0.0;
- demo_item->width = 0.0;
- demo_item->height = 0.0;
+ demo_item->size = 0.0;
+}
+
+void
+goo_demo_item_move_to (GooCanvasItem *item,
+ gdouble x,
+ gdouble y)
+{
+ cairo_matrix_t matrix;
+
+ cairo_matrix_init_translate (&matrix, x, y);
+ goo_canvas_item_set_transform (item, &matrix);
}
/* The convenience function to create new items. This should start with a
goo_demo_item_new (GooCanvasItem *parent,
gdouble x,
gdouble y,
- gdouble width,
- gdouble height,
+ gdouble size,
+ char letter,
...)
{
GooCanvasItem *item;
item = g_object_new (GOO_TYPE_DEMO_ITEM, NULL);
demo_item = (GooDemoItem*) item;
- demo_item->x = x;
- demo_item->y = y;
- demo_item->width = width;
- demo_item->height = height;
+ demo_item->size = size;
+ demo_item->letter = letter;
- va_start (var_args, height);
+ va_start (var_args, letter);
first_property = va_arg (var_args, char*);
if (first_property)
g_object_set_valist ((GObject*) item, first_property, var_args);
g_object_unref (item);
}
+ goo_demo_item_move_to (item, x, y);
+
return item;
}
GooDemoItem *demo_item = (GooDemoItem*) simple;
/* Compute the new bounds. */
- simple->bounds.x1 = demo_item->x;
- simple->bounds.y1 = demo_item->y;
- simple->bounds.x2 = demo_item->x + demo_item->width;
- simple->bounds.y2 = demo_item->y + demo_item->height;
+ simple->bounds.x1 = 0;
+ simple->bounds.y1 = 0;
+ simple->bounds.x2 = demo_item->size;
+ simple->bounds.y2 = demo_item->size;
/* Convert to device coordinates. */
goo_canvas_item_simple_user_bounds_to_device (simple, cr, &simple->bounds);
cairo_t *cr,
GooCanvasBounds *bounds)
{
- GooDemoItem *demo_item = (GooDemoItem*) simple;
+ GooDemoItem *item = (GooDemoItem*) simple;
+ cairo_pattern_t *gradient;
+ cairo_text_extents_t extents;
+ int rad = (int) (item->size / 2);
+ int cx = item->size / 2;
+ int cy = cx;
+ double spot_angle = M_PI / 4.0;
+ double spot_rad = rad / 2.0;
+ char string[2];
+
+ cairo_save (cr);
+
+ gradient = cairo_pattern_create_radial (cx - spot_rad * cos (spot_angle),
+ cy - spot_rad * sin (spot_angle),
+ 0.0,
+ cx - spot_rad * cos (spot_angle),
+ cy - spot_rad * sin (spot_angle),
+ rad + spot_rad);
+ cairo_pattern_add_color_stop_rgb (gradient, 0.0, 1.0, 1.0, 1.0);
+ cairo_pattern_add_color_stop_rgb (gradient, 1.0, 0.33, 0.33, 0.33);
+
+ cairo_set_source (cr, gradient);
+
+ cairo_arc (cr,
+ cx, cy,
+ rad, 0, 2 * M_PI);
- cairo_move_to (cr, demo_item->x, demo_item->y);
- cairo_line_to (cr, demo_item->x, demo_item->y + demo_item->height);
- cairo_line_to (cr, demo_item->x + demo_item->width,
- demo_item->y + demo_item->height);
- cairo_line_to (cr, demo_item->x + demo_item->width, demo_item->y);
- cairo_close_path (cr);
- goo_canvas_style_set_fill_options (simple->simple_data->style, cr);
cairo_fill (cr);
+
+ cairo_select_font_face (cr, "mono",
+ CAIRO_FONT_SLANT_NORMAL,
+ CAIRO_FONT_WEIGHT_BOLD);
+ cairo_set_font_size (cr, 1.8 * rad);
+
+ string[0] = item->letter;
+ string[1] = '\0';
+ cairo_text_extents (cr, string, &extents);
+ cairo_move_to (cr,
+ cx - extents.width / 2 - extents.x_bearing,
+ cy - extents.height / 2 - extents.y_bearing);
+
+ cairo_set_source_rgb (cr, 0.2, 0.3, 0.8);
+ cairo_show_text (cr, string);
+
+ cairo_restore (cr);
}
/* Hit detection. This should check if the given coordinate (in the item's
{
GooDemoItem *demo_item = (GooDemoItem*) simple;
- if (x < demo_item->x || (x > demo_item->x + demo_item->width)
- || y < demo_item->y || (y > demo_item->y + demo_item->height))
+ if (x < 0 || (x > demo_item->size)
+ || y < 0 || (y > demo_item->size))
return NULL;
return (GooCanvasItem*) simple;