ClickHouse/dbms/include/DB/Common/UnicodeBar.h

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This file contains ambiguous Unicode characters

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#pragma once
#include <cstring>
#include <cmath>
#include <string>
#define UNICODE_BAR_CHAR_SIZE (strlen("█"))
/** Позволяет нарисовать unicode-art полоску, ширина которой отображается с разрешением 1/8 символа.
*/
namespace UnicodeBar
{
template <typename T>
double getWidth(T x, int64_t min, int64_t max, double max_width)
{
if (x <= min)
return 0;
if (x >= max)
return max_width;
return (x - min) * max_width / (max - min);
}
inline size_t getWidthInBytes(double width)
{
return ceil(width - 1.0 / 8) * UNICODE_BAR_CHAR_SIZE;
}
/// В dst должно быть место для barWidthInBytes(width) символов и завершающего нуля.
inline void render(double width, char * dst)
{
size_t floor_width = floor(width);
for (size_t i = 0; i < floor_width; ++i)
{
memcpy(dst, "", UNICODE_BAR_CHAR_SIZE);
dst += UNICODE_BAR_CHAR_SIZE;
}
size_t remainder = floor((width - floor_width) * 8);
if (remainder)
{
memcpy(dst, &"▏▎▍▌▋▋▊▉"[(remainder - 1) * UNICODE_BAR_CHAR_SIZE], UNICODE_BAR_CHAR_SIZE);
dst += UNICODE_BAR_CHAR_SIZE;
}
*dst = 0;
}
inline std::string render(double width)
{
std::string res(getWidthInBytes(width), '\0');
render(width, &res[0]);
return res;
}
}