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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GraphWidget.h"
#include <LibGUI/Application.h>
#include <LibGUI/Painter.h>
#include <LibGfx/Font.h>
#include <LibGfx/Palette.h>
#include <LibGfx/Path.h>
#include <LibGfx/SystemTheme.h>
GraphWidget::GraphWidget()
{
}
GraphWidget::~GraphWidget()
{
}
void GraphWidget::add_value(Vector<int, 1>&& value)
{
m_values.enqueue(move(value));
update();
}
void GraphWidget::paint_event(GUI::PaintEvent& event)
{
const auto& system_palette = GUI::Application::the()->palette();
GUI::Frame::paint_event(event);
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.add_clip_rect(frame_inner_rect());
painter.fill_rect(event.rect(), palette().base());
auto inner_rect = frame_inner_rect();
float scale = (float)inner_rect.height() / (float)m_max;
if (!m_values.is_empty()) {
// Draw one set of values at a time
for (size_t k = 0; k < m_value_format.size(); k++) {
const auto& format = m_value_format[k];
if (format.graph_color_role == ColorRole::Base) {
continue;
}
const auto& line_color = system_palette.color(format.graph_color_role);
const auto& background_color = line_color.with_alpha(0x7f);
m_calculated_points.clear_with_capacity();
for (size_t i = 0; i < m_values.size(); i++) {
int x = inner_rect.right() - (i * 2) + 1;
if (x < 0)
break;
const auto& current_values = m_values.at(m_values.size() - i - 1);
if (current_values.size() <= k) {
// Don't have a data point
m_calculated_points.append({ -1, -1 });
continue;
}
float value = current_values[k];
if (m_stack_values) {
for (size_t l = k + 1; l < current_values.size(); l++)
value += current_values[l];
}
float scaled_value = value * scale;
Gfx::IntPoint current_point { x, inner_rect.bottom() - (int)scaled_value };
m_calculated_points.append(current_point);
}
VERIFY(m_calculated_points.size() <= m_values.size());
if (format.graph_color_role != ColorRole::Base) {
// Fill the background for the area we have values for
Gfx::Path path;
size_t points_in_path = 0;
bool started_path = false;
const Gfx::IntPoint* current_point = nullptr;
const Gfx::IntPoint* first_point = nullptr;
auto check_fill_area = [&]() {
if (!started_path)
return;
if (points_in_path > 1) {
VERIFY(current_point);
VERIFY(first_point);
path.line_to({ current_point->x() - 1, inner_rect.bottom() + 1 });
path.line_to({ first_point->x() + 1, inner_rect.bottom() + 1 });
path.close();
painter.fill_path(path, background_color, Gfx::Painter::WindingRule::EvenOdd);
} else if (points_in_path == 1 && current_point) {
// Can't fill any area, we only have one data point.
// Just draw a vertical line as a "fill"...
painter.draw_line(*current_point, { current_point->x(), inner_rect.bottom() }, background_color);
}
path = {};
points_in_path = 0;
first_point = nullptr;
started_path = false;
};
for (size_t i = 0; i < m_calculated_points.size(); i++) {
current_point = &m_calculated_points[i];
if (current_point->x() < 0) {
check_fill_area();
continue;
}
if (!started_path) {
path.move_to({ current_point->x() + 1, current_point->y() });
points_in_path = 1;
first_point = current_point;
started_path = true;
} else {
path.line_to({ current_point->x(), current_point->y() });
points_in_path++;
}
}
check_fill_area();
}
if (format.graph_color_role != ColorRole::Base) {
// Draw the line for the data points we have
const Gfx::IntPoint* previous_point = nullptr;
for (size_t i = 0; i < m_calculated_points.size(); i++) {
const auto& current_point = m_calculated_points[i];
if (current_point.x() < 0) {
previous_point = nullptr;
continue;
}
if (previous_point)
painter.draw_line(*previous_point, current_point, line_color);
previous_point = ¤t_point;
}
}
}
}
if (!m_values.is_empty() && !m_value_format.is_empty()) {
const auto& current_values = m_values.last();
int y = 0;
for (size_t i = 0; i < min(m_value_format.size(), current_values.size()); i++) {
const auto& format = m_value_format[i];
const auto& graph_color = system_palette.color(format.graph_color_role);
if (!format.text_formatter)
continue;
auto constrain_rect = inner_rect.shrunken(8, 8);
auto text_rect = constrain_rect.translated(0, y).intersected(constrain_rect);
text_rect.set_height(font().glyph_height());
auto text = format.text_formatter(current_values[i]);
if (format.text_shadow_color != Color::Transparent)
painter.draw_text(text_rect.translated(1, 1), text.characters(), Gfx::TextAlignment::CenterRight, format.text_shadow_color);
painter.draw_text(text_rect, text.characters(), Gfx::TextAlignment::CenterRight, graph_color);
y += text_rect.height() + 4;
}
}
}
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