static void
wire_changed_callback (Wire *wire, WireItem *item)
{
SheetPos start_pos, length;
GooCanvasPoints *points;
wire_get_pos_and_length (wire, &start_pos, &length);
points = goo_canvas_points_new (2);
points->coords[0] = 0;
points->coords[1] = 0;
points->coords[2] = length.x;
points->coords[3] = length.y;
g_object_set (item->priv->line,
"points", points,
NULL);
goo_canvas_points_unref (points);
g_object_set (item->priv->resize1,
"x", -RESIZER_SIZE,
"y", -RESIZER_SIZE,
"width", 2 * RESIZER_SIZE,
"height", 2 * RESIZER_SIZE,
NULL);
g_object_set (item->priv->resize2,
"x", length.x-RESIZER_SIZE,
"y", length.y-RESIZER_SIZE,
"width", 2 * RESIZER_SIZE,
"height", 2 * RESIZER_SIZE,
NULL);
goo_canvas_item_request_update (GOO_CANVAS_ITEM (item->priv->line));
}
static void
wire_changed_callback (Wire *wire, WireItem *item)
{
Coords start_pos, length;
GooCanvasPoints *points;
g_return_if_fail (wire != NULL);
g_return_if_fail (IS_ITEM_DATA (wire));
g_return_if_fail (item != NULL);
g_return_if_fail (IS_WIRE_ITEM (item));
wire_get_pos_and_length (wire, &start_pos, &length);
Sheet *sheet = SHEET (goo_canvas_item_get_canvas (GOO_CANVAS_ITEM (item)));
if (G_UNLIKELY(!sheet)) {
g_warning ("Failed to determine the Sheet the item is glued to. This should never happen. Ever!");
} else {
item_data_snap (ITEM_DATA (wire), sheet->grid);
}
// Move the canvas item and invalidate the bbox cache.
goo_canvas_item_set_simple_transform (GOO_CANVAS_ITEM (item),
start_pos.x,
start_pos.y,
1.0,
0.0);
item->priv->cache_valid = FALSE;
points = goo_canvas_points_new (2);
points->coords[0] = 0;
points->coords[1] = 0;
points->coords[2] = length.x;
points->coords[3] = length.y;
// this does handle cleanup of previous points internally
g_object_set (item->priv->line,
"points", points,
NULL);
goo_canvas_points_unref (points);
g_object_set (item->priv->resize1,
"x", -RESIZER_SIZE,
"y", -RESIZER_SIZE,
"width", 2 * RESIZER_SIZE,
"height", 2 * RESIZER_SIZE,
NULL);
g_object_set (item->priv->resize2,
"x", length.x-RESIZER_SIZE,
"y", length.y-RESIZER_SIZE,
"width", 2 * RESIZER_SIZE,
"height", 2 * RESIZER_SIZE,
NULL);
goo_canvas_item_request_update (GOO_CANVAS_ITEM (item->priv->line));
}
/**
* ppg_visualizer_task_notify_state:
* @visualizer: (in): A #PpgVisualizer.
* @pspec: (in): A #GParamSpec.
* @task: (in): A #PpgTask.
*
* Handle the "notify::state" signal from @task. Update the visualizer
* pattern if necessary.
*
* Returns: None.
* Side effects: None.
*/
static void
ppg_visualizer_task_notify_state (PpgVisualizer *visualizer,
GParamSpec *pspec,
PpgTask *task)
{
PpgVisualizerPrivate *priv;
cairo_surface_t *surface;
PpgTaskState state;
cairo_t *cr;
gdouble begin_time;
gdouble height;
gdouble total_width;
gdouble span;
gdouble width;
gdouble x;
gdouble y;
g_return_if_fail(PPG_IS_VISUALIZER(visualizer));
g_return_if_fail(PPG_IS_TASK(task));
g_return_if_fail(visualizer->priv->surface);
priv = visualizer->priv;
/*
* We don't own the reference, so safe to just drop our pointer. Using
* GObjects weak pointers here would be a lot of maintenance pain.
*/
if (priv->task == task) {
priv->task = NULL;
}
g_object_get(task,
"state", &state,
"surface", &surface,
NULL);
if (state == PPG_TASK_SUCCESS) {
g_object_get(task,
"begin-time", &begin_time,
"height", &height,
"width", &width,
"x", &x,
"y", &y,
NULL);
span = priv->end_time - priv->begin_time;
g_object_get(visualizer, "width", &total_width, NULL);
x = (begin_time - priv->begin_time) / span * total_width;
/*
* Only draw what we can do on integer aligned offsets.
*
* TODO: We need to make sure we render extra area to prevent
* a striping effect.
*/
width -= ceil(x) - x;
x = ceil(x);
cr = cairo_create(priv->surface);
cairo_set_source_surface(cr, surface, x, y);
if (cairo_status(cr) != 0) {
cairo_destroy(cr);
GOTO(failure);
}
/*
* Clip the range of the draw.
*/
cairo_rectangle(cr, x, y, width, height);
cairo_clip_preserve(cr);
/*
* Clear the draw area.
*/
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_fill_preserve(cr);
cairo_restore(cr);
/*
* Fill in the rendered image.
*/
cairo_fill(cr);
cairo_destroy(cr);
goo_canvas_item_request_update(GOO_CANVAS_ITEM(visualizer));
}
failure:
/*
* Release our surface that was allocated for the draw request.
*/
if ((state & PPG_TASK_FINISHED_MASK) != 0) {
cairo_surface_destroy(surface);
}
}
