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Feature: Canvas (#287)

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Draw using braille and block characters on a grid.
This commit is contained in:
Arthur Sonzogni
2021-12-23 14:17:33 +01:00
committed by GitHub
parent 7e5cd23b4c
commit 0d47dd19ab
15 changed files with 1098 additions and 10 deletions
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137
include/ftxui/dom/canvas.hpp Normal file
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@@ -0,0 +1,137 @@
#ifndef FTXUI_DOM_CANVAS_HPP
#define FTXUI_DOM_CANVAS_HPP
#include "ftxui/screen/color.hpp"
#include "ftxui/screen/screen.hpp"
#include <unordered_map>
#include <functional>
namespace ftxui {
struct Canvas {
public:
Canvas() {}
Canvas(int width, int height);
// Getters:
int width() const { return width_; }
int height() const { return height_; }
Pixel GetPixel(int x, int y) const;
using Stylizer = std::function<void(Pixel&)>;
// Draws using braille characters --------------------------------------------
void DrawPointOn(int x, int y);
void DrawPointOff(int x, int y);
void DrawPointToggle(int x, int y);
void DrawPoint(int x, int y, bool value);
void DrawPoint(int x, int y, bool value, const Stylizer& s);
void DrawPoint(int x, int y, bool value, const Color& color);
void DrawPointLine(int x1, int y1, int x2, int y2);
void DrawPointLine(int x1, int y1, int x2, int y2, const Stylizer& s);
void DrawPointLine(int x1, int y1, int x2, int y2, const Color& color);
void DrawPointCircle(int x, int y, int radius);
void DrawPointCircle(int x, int y, int radius, const Stylizer& s);
void DrawPointCircle(int x, int y, int radius, const Color& color);
void DrawPointCircleFilled(int x, int y, int radius);
void DrawPointCircleFilled(int x,
int y,
int radius,
const Stylizer& s);
void DrawPointCircleFilled(int x, int y, int radius, const Color& color);
void DrawPointEllipse(int x, int y, int r1, int r2);
void DrawPointEllipse(int x, int y, int r1, int r2, const Color& color);
void DrawPointEllipse(int x, int y, int r1, int r2, const Stylizer& s);
void DrawPointEllipseFilled(int x, int y, int r1, int r2);
void DrawPointEllipseFilled(int x,
int y,
int r1,
int r2,
const Color& color);
void DrawPointEllipseFilled(int x,
int y,
int r1,
int r2,
const Stylizer& s);
// Draw using box characters -------------------------------------------------
// Block are of size 1x2. y is considered to be a multiple of 2.
void DrawBlockOn(int x, int y);
void DrawBlockOff(int x, int y);
void DrawBlockToggle(int x, int y);
void DrawBlock(int x, int y, bool value);
void DrawBlock(int x, int y, bool value, const Stylizer& s);
void DrawBlock(int x, int y, bool value, const Color& color);
void DrawBlockLine(int x1, int y1, int x2, int y2);
void DrawBlockLine(int x1, int y1, int x2, int y2, const Stylizer& s);
void DrawBlockLine(int x1, int y1, int x2, int y2, const Color& color);
void DrawBlockCircle(int x1, int y1, int radius);
void DrawBlockCircle(int x1, int y1, int radius, const Stylizer& s);
void DrawBlockCircle(int x1, int y1, int radius, const Color& color);
void DrawBlockCircleFilled(int x1, int y1, int radius);
void DrawBlockCircleFilled(int x1, int y1, int radius, const Stylizer& s);
void DrawBlockCircleFilled(int x1, int y1, int radius, const Color& color);
void DrawBlockEllipse(int x1, int y1, int r1, int r2);
void DrawBlockEllipse(int x1, int y1, int r1, int r2, const Stylizer& s);
void DrawBlockEllipse(int x1, int y1, int r1, int r2, const Color& color);
void DrawBlockEllipseFilled(int x1, int y1, int r1, int r2);
void DrawBlockEllipseFilled(int x1,
int y1,
int r1,
int r2,
const Stylizer& s);
void DrawBlockEllipseFilled(int x1,
int y1,
int r1,
int r2,
const Color& color);
// Draw using normal characters ----------------------------------------------
// Draw using character of size 2x4 at position (x,y)
// x is considered to be a multiple of 2.
// y is considered to be a multiple of 4.
void DrawText(int x, int y, const std::string& value);
void DrawText(int x, int y, const std::string& value, const Color& color);
void DrawText(int x,
int y,
const std::string& value,
const Stylizer& style);
// Decorator:
// x is considered to be a multiple of 2.
// y is considered to be a multiple of 4.
void Style(int x, int y, const Stylizer& style);
private:
bool IsIn(int x, int y) const {
return x >= 0 && x < width_ && y >= 0 && y < height_;
}
enum CellType {
kBraille,
kBlock,
kText,
};
struct Cell {
CellType type = kText;
Pixel content;
};
struct XY {
int x;
int y;
bool operator==(const XY& other) const {
return x == other.x && y == other.y;
}
};
struct XYHash {
size_t operator()(const XY& xy) const { return xy.x * 1024 + xy.y; }
};
int width_ = 0;
int height_ = 0;
std::unordered_map<XY, Cell, XYHash> storage_;
};
} // namespace ftxui
#endif // FTXUI_DOM_CANVAS_HPP

3
include/ftxui/dom/elements.hpp
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@@ -4,12 +4,14 @@
#include <functional>
#include <memory>
#include "ftxui/dom/canvas.hpp"
#include "ftxui/dom/flexbox_config.hpp"
#include "ftxui/dom/node.hpp"
#include "ftxui/screen/box.hpp"
#include "ftxui/screen/color.hpp"
#include "ftxui/screen/screen.hpp"
#include "ftxui/screen/terminal.hpp"
#include "ftxui/util/ref.hpp"
namespace ftxui {
class Node;
@@ -57,6 +59,7 @@ Element paragraphAlignCenter(std::string text);
Element paragraphAlignJustify(std::string text);
Element graph(GraphFunction);
Element emptyElement();
Element ElementFrom(ConstRef<Canvas>);
// -- Decorator ---
Element bold(Element);