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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "GraphWidget.h"
28#include <LibGUI/Painter.h>
29#include <LibGfx/Font.h>
30
31GraphWidget::GraphWidget()
32{
33}
34
35GraphWidget::~GraphWidget()
36{
37}
38
39void GraphWidget::add_value(int value)
40{
41 m_values.enqueue(value);
42 update();
43}
44
45void GraphWidget::paint_event(GUI::PaintEvent& event)
46{
47 GUI::Frame::paint_event(event);
48 GUI::Painter painter(*this);
49 painter.add_clip_rect(event.rect());
50 painter.add_clip_rect(frame_inner_rect());
51 painter.fill_rect(event.rect(), Color::Black);
52
53 auto inner_rect = frame_inner_rect();
54 float scale = (float)inner_rect.height() / (float)m_max;
55
56 Gfx::Point prev_point;
57 for (size_t i = 0; i < m_values.size(); ++i) {
58 int x = inner_rect.right() - (i * 2) + 1;
59 if (x < 0)
60 break;
61 float scaled_value = (float)m_values.at(m_values.size() - i - 1) * scale;
62 Gfx::Point point = { x, inner_rect.bottom() - (int)scaled_value };
63 if (i != 0)
64 painter.draw_line(prev_point, point, m_graph_color);
65 prev_point = point;
66 }
67
68 if (!m_values.is_empty() && text_formatter) {
69 Gfx::Rect text_rect = inner_rect.shrunken(8, 8);
70 text_rect.set_height(font().glyph_height());
71 auto text = text_formatter(m_values.last(), m_max);
72 painter.draw_text(text_rect.translated(1, 1), text.characters(), Gfx::TextAlignment::CenterRight, Color::Black);
73 painter.draw_text(text_rect, text.characters(), Gfx::TextAlignment::CenterRight, m_text_color);
74 }
75}