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graph.cpp
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// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include <functional> // for function
#include <memory> // for allocator, make_shared
#include <string> // for string
#include <utility> // for move
#include <vector> // for vector
#include "ftxui/dom/elements.hpp" // for GraphFunction, Element, graph
#include "ftxui/dom/node.hpp" // for Node
#include "ftxui/dom/requirement.hpp" // for Requirement
#include "ftxui/screen/box.hpp" // for Box
#include "ftxui/screen/screen.hpp" // for Screen
namespace ftxui {
namespace {
// NOLINTNEXTLINE
static std::string charset[] =
#if defined(FTXUI_MICROSOFT_TERMINAL_FALLBACK)
// Microsoft's terminals often use fonts not handling the 8 unicode
// characters for representing the whole graph. Fallback with less.
{" ", " ", "█", " ", "█", "█", "█", "█", "█"};
#else
{" ", "▗", "▐", "▖", "▄", "▟", "▌", "▙", "█"};
#endif
class Graph : public Node {
public:
explicit Graph(GraphFunction graph_function)
: graph_function_(std::move(graph_function)) {}
void ComputeRequirement() override {
requirement_.flex_grow_x = 1;
requirement_.flex_grow_y = 1;
requirement_.flex_shrink_x = 1;
requirement_.flex_shrink_y = 1;
requirement_.min_x = 3;
requirement_.min_y = 3;
}
void Render(Screen& screen) override {
const int width = (box_.x_max - box_.x_min + 1) * 2;
const int height = (box_.y_max - box_.y_min + 1) * 2;
if (width <= 0 || height <= 0) {
return;
}
auto data = graph_function_(width, height);
int i = 0;
for (int x = box_.x_min; x <= box_.x_max; ++x) {
const int height_1 = 2 * box_.y_max - data[i++];
const int height_2 = 2 * box_.y_max - data[i++];
for (int y = box_.y_min; y <= box_.y_max; ++y) {
const int yy = 2 * y;
int i_1 = yy < height_1 ? 0 : yy == height_1 ? 3 : 6; // NOLINT
int i_2 = yy < height_2 ? 0 : yy == height_2 ? 1 : 2; // NOLINT
screen.at(x, y) = charset[i_1 + i_2]; // NOLINT
}
}
}
private:
GraphFunction graph_function_;
};
} // namespace
/// @brief Draw a graph using a GraphFunction.
/// @param graph_function the function to be called to get the data.
Element graph(GraphFunction graph_function) {
return std::make_shared<Graph>(std::move(graph_function));
}
} // namespace ftxui
box.hpp
ftxui::Node
Definition node.hpp:23
elements.hpp
ftxui
Definition animation.hpp:10
ftxui::Element
std::shared_ptr< Node > Element
Definition elements.hpp:22
ftxui::GraphFunction
std::function< std::vector< int >(int, int)> GraphFunction
Definition elements.hpp:25
ftxui::Render
void Render(Screen &screen, const Element &element)
Display an element on a ftxui::Screen.
Definition node.cpp:88
ftxui::graph
Element graph(GraphFunction)
Draw a graph using a GraphFunction.
Definition graph.cpp:71
node.hpp
requirement.hpp
screen.hpp