static void
gtk_databox_bars_real_draw (GtkDataboxGraph *graph,
GtkDataboxCanvas *canvas)
{
GtkDataboxBars *bars = GTK_DATABOX_BARS (graph);
GdkSegment *data;
guint i = 0;
gfloat *X;
gfloat *Y;
gint len;
gint size = 0;
gint16 zero = 0;
g_return_if_fail (GTK_DATABOX_IS_BARS (bars));
g_return_if_fail (canvas);
g_return_if_fail (canvas->pixmap);
if (!graph->gc)
gtk_databox_graph_create_gc (graph, canvas);
len = gtk_databox_xyc_graph_get_length (GTK_DATABOX_XYC_GRAPH (graph));
X = gtk_databox_xyc_graph_get_X (GTK_DATABOX_XYC_GRAPH (graph));
Y = gtk_databox_xyc_graph_get_Y (GTK_DATABOX_XYC_GRAPH (graph));
size = gtk_databox_graph_get_size (graph);
data = bars->priv->data;
zero = (gint16) ((0 - canvas->top_left_visible.y)
* canvas->translation_factor.y);
for (i = 0; i < len; i++, data++, X++, Y++)
{
data->x1 = data->x2 =
(gint16) ((*X - canvas->top_left_visible.x)
* canvas->translation_factor.x);
data->y1 = zero;
data->y2 =
(gint16) ((*Y - canvas->top_left_visible.y)
* canvas->translation_factor.y);
}
/* More than 2^16 bars will cause X IO error on most XServers
(Hint from Paul Barton-Davis) */
for (i = 0; i < len; i += 65536)
{
gdk_draw_segments (canvas->pixmap, graph->gc,
bars->priv->data + i,
MIN (65536, len - i));
}
return;
}
static void
gtk_databox_bars_real_draw (GtkDataboxGraph * graph,
GtkDatabox* box)
{
GtkDataboxBars *bars = GTK_DATABOX_BARS (graph);
GtkDataboxBarsPrivate *priv=GTK_DATABOX_BARS_GET_PRIVATE(bars);
guint i = 0;
void *X;
void *Y;
guint len, maxlen;
gint16 zero = 0;
gfloat fzero = 0.0;
cairo_t *cr;
gint16 *xpixels, *ypixels;
guint xstart, xstride, ystart, ystride;
GType xtype, ytype;
g_return_if_fail (GTK_DATABOX_IS_BARS (bars));
g_return_if_fail (GTK_IS_DATABOX (box));
if (gtk_databox_get_scale_type_y (box) == GTK_DATABOX_SCALE_LOG)
g_warning
("gtk_databox_bars do not work well with logarithmic scale in Y axis");
cr = gtk_databox_graph_create_gc (graph, box);
len = gtk_databox_xyc_graph_get_length (GTK_DATABOX_XYC_GRAPH (graph));
maxlen = gtk_databox_xyc_graph_get_maxlen (GTK_DATABOX_XYC_GRAPH (graph));
if (priv->pixelsalloc < len)
{
priv->pixelsalloc = len;
priv->xpixels = (gint16 *)g_realloc(priv->xpixels, len * sizeof(gint16));
priv->ypixels = (gint16 *)g_realloc(priv->ypixels, len * sizeof(gint16));
}
xpixels = priv->xpixels;
ypixels = priv->ypixels;
X = gtk_databox_xyc_graph_get_X (GTK_DATABOX_XYC_GRAPH (graph));
xstart = gtk_databox_xyc_graph_get_xstart (GTK_DATABOX_XYC_GRAPH (graph));
xstride = gtk_databox_xyc_graph_get_xstride (GTK_DATABOX_XYC_GRAPH (graph));
xtype = gtk_databox_xyc_graph_get_xtype (GTK_DATABOX_XYC_GRAPH (graph));
gtk_databox_values_to_xpixels(box, xpixels, X, xtype, maxlen, xstart, xstride, len);
Y = gtk_databox_xyc_graph_get_Y (GTK_DATABOX_XYC_GRAPH (graph));
ystart = gtk_databox_xyc_graph_get_ystart (GTK_DATABOX_XYC_GRAPH (graph));
ystride = gtk_databox_xyc_graph_get_ystride (GTK_DATABOX_XYC_GRAPH (graph));
ytype = gtk_databox_xyc_graph_get_ytype (GTK_DATABOX_XYC_GRAPH (graph));
gtk_databox_values_to_ypixels(box, ypixels, Y, ytype, maxlen, ystart, ystride, len);
gtk_databox_values_to_ypixels(box, &zero, &fzero, G_TYPE_FLOAT, 1, 0, 1, 1);
for (i = 0; i < len; i++, xpixels++, ypixels++)
{
cairo_move_to (cr, *xpixels + 0.5, zero + 0.5);
cairo_line_to (cr, *xpixels + 0.5, *ypixels + 0.5);
}
cairo_stroke(cr);
cairo_destroy(cr);
return;
}