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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Baobab - disk usage analyzer
*
* Copyright (C) 2008 Igalia
* Copyright (C) 2013 Stefano Facchini <stefano.facchini@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Authors of the original code:
* Fabio Marzocca <thesaltydog@gmail.com>
* Paolo Borelli <pborelli@katamail.com>
* Miguel Gomez <magomez@igalia.com>
* Eduardo Lima Mitev <elima@igalia.com>
*/
namespace Baobab {
class TreemapItem : ChartItem {
public Cairo.Rectangle cr_rect;
}
public class Treemap : Chart {
const int ITEM_BORDER_WIDTH = 1;
const int ITEM_PADDING = 6;
const int ITEM_TEXT_PADDING = 3;
const int ITEM_MIN_WIDTH = 3;
const int ITEM_MIN_HEIGHT = 3;
uint max_visible_depth;
bool more_visible_children;
protected override ChartItem create_new_chartitem () {
return (new TreemapItem () as ChartItem);
}
void draw_rectangle (Cairo.Context cr,
double x,
double y,
double width,
double height,
Gdk.RGBA fill_color,
string text,
bool show_text) {
uint border = ITEM_BORDER_WIDTH;
var context = get_style_context ();
cr.set_line_width (border);
cr.rectangle (x + border, y + border, width - border * 2, height - border * 2);
Gdk.cairo_set_source_rgba (cr, fill_color);
cr.fill_preserve ();
var border_color = context.get_border_color (Gtk.StateFlags.NORMAL);
Gdk.cairo_set_source_rgba (cr, border_color);
cr.stroke ();
if (show_text) {
var layout = create_pango_layout (null);
var markup = Markup.escape_text (text);
layout.set_markup (markup, -1);
Pango.Rectangle rect;
layout.get_pixel_extents (null, out rect);
if ((rect.width + ITEM_TEXT_PADDING * 2 <= width) &&
(rect.height + ITEM_TEXT_PADDING * 2 <= height)) {
context.render_layout (cr, x + width / 2 - rect.width / 2, y + height / 2 - rect.height / 2, layout);
}
}
}
protected override void draw_item (Cairo.Context cr, ChartItem item, bool highlighted) {
Cairo.Rectangle rect;
Gdk.RGBA fill_color = Gdk.RGBA ();
Gtk.Allocation allocation;
double width = 0, height = 0;
rect = (item as TreemapItem).cr_rect;
get_allocation (out allocation);
if ((item.depth % 2) != 0) {
fill_color = get_item_color (rect.x / allocation.width * 200,
item.depth, highlighted);
width = rect.width - ITEM_PADDING;
height = rect.height;
} else {
fill_color = get_item_color (rect.y / allocation.height * 200,
item.depth, highlighted);
width = rect.width;
height = rect.height - ITEM_PADDING;
}
draw_rectangle (cr, rect.x, rect.y, width, height, fill_color, item.name, (!item.has_visible_children));
}
protected override void calculate_item_geometry (ChartItem item) {
TreemapItem treemapitem = item as TreemapItem;
Cairo.Rectangle p_area = Cairo.Rectangle ();
if (item.depth == 0) {
max_visible_depth = 0;
more_visible_children = false;
}
item.visible = false;
if (item.parent == null) {
Gtk.Allocation allocation;
get_allocation (out allocation);
p_area.x = -ITEM_PADDING / 2;
p_area.y = -ITEM_PADDING / 2;
p_area.width = allocation.width + ITEM_PADDING * 2;
p_area.height = allocation.height + ITEM_PADDING * 2;
} else {
p_area = (item.parent.data as TreemapItem).cr_rect;
}
if (item.depth % 2 != 0) {
var width = p_area.width - ITEM_PADDING;
treemapitem.cr_rect.x = p_area.x + (item.rel_start * width / 100) + ITEM_PADDING;
treemapitem.cr_rect.y = p_area.y + ITEM_PADDING;
treemapitem.cr_rect.width = width * item.rel_size / 100;
treemapitem.cr_rect.height = p_area.height - ITEM_PADDING * 3;
} else {
var height = p_area.height - ITEM_PADDING;
treemapitem.cr_rect.x = p_area.x + ITEM_PADDING;
treemapitem.cr_rect.y = p_area.y + (item.rel_start * height / 100) + ITEM_PADDING;
treemapitem.cr_rect.width = p_area.width - ITEM_PADDING * 3;
treemapitem.cr_rect.height = height * item.rel_size / 100;
}
if ((treemapitem.cr_rect.width - ITEM_PADDING < ITEM_MIN_WIDTH) ||
(treemapitem.cr_rect.height - ITEM_PADDING < ITEM_MIN_HEIGHT)) {
return;
}
treemapitem.cr_rect.x = Math.floor (treemapitem.cr_rect.x) + 0.5;
treemapitem.cr_rect.y = Math.floor (treemapitem.cr_rect.y) + 0.5;
treemapitem.cr_rect.width = Math.floor (treemapitem.cr_rect.width);
treemapitem.cr_rect.height = Math.floor (treemapitem.cr_rect.height);
item.visible = true;
if (item.parent != null) {
item.parent.data.has_visible_children = true;
}
get_item_rectangle (item);
if (item.depth == max_depth + 1) {
more_visible_children = true;
} else {
max_visible_depth = uint.max (max_visible_depth, item.depth);
}
}
protected override void get_item_rectangle (ChartItem item) {
var crect = (item as TreemapItem).cr_rect;
item.rect.x = (int) crect.x;
item.rect.y = (int) crect.y;
if (item.depth % 2 != 0) {
item.rect.width = (int) crect.width - ITEM_PADDING;
item.rect.height = (int) crect.height;
} else {
item.rect.width = (int) crect.width;
item.rect.height = (int) crect.height - ITEM_PADDING;
}
}
protected override bool is_point_over_item (ChartItem item, double x, double y) {
var rect = item.rect;
return ((x >= rect.x) && (x <= (rect.x + rect.width)) &&
(y >= rect.y) && (y <= (rect.y + rect.height)));
}
protected override bool can_zoom_out () {
return more_visible_children;
}
protected override bool can_zoom_in () {
return (max_visible_depth > 1);
}
}
}
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