Created
March 14, 2021 23:18
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donut.cpp
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| // yes. | |
| #include <algorithm> | |
| #define MAX_SIZE 1760 | |
| #define CHARS_MAP ".,-~:;=!*#$@" | |
| float step_x = 0; | |
| float step_y = 0; | |
| float transforms[ MAX_SIZE ]; | |
| char chars[ MAX_SIZE ]; | |
| void draw_donut( ) { | |
| memset( chars, 32, MAX_SIZE ); | |
| memset( transforms, 0, MAX_SIZE * 4 ); | |
| float step_x_sin = static_cast< float >( sin( step_x ) ); | |
| float step_x_cos = static_cast< float >( cos( step_x ) ); | |
| float step_y_sin = static_cast< float >( sin( step_y ) ); | |
| float step_y_cos = static_cast< float >( cos( step_y ) ); | |
| for ( float pos_x = 0.f; 6.28f > pos_x; pos_x += 0.07f ) { | |
| for ( float pos_y = 0.f; 6.28f > pos_y; pos_y += 0.02f ) { | |
| float x_sin = static_cast< float >( sin( pos_x ) ); | |
| float x_cos = static_cast< float >( cos( pos_x ) ); | |
| float x_cos_mult = x_cos + 2.f; | |
| float y_sin = static_cast< float >( sin( pos_y ) ); | |
| float y_cos = static_cast< float >( cos( pos_y ) ); | |
| float new_transform_value = 1.f / ( y_sin * x_cos_mult * step_x_sin + x_sin * step_x_cos + 5.f ); | |
| float multiplier = y_sin * x_cos_mult * step_x_cos - x_sin * step_x_sin; | |
| int x = static_cast< int >( 40 + 30 * new_transform_value * ( y_cos * x_cos_mult * step_y_cos - multiplier * step_y_sin ) ); | |
| int y = static_cast< int >( 12 + 15 * new_transform_value * ( y_cos * x_cos_mult * step_y_sin + multiplier * step_y_cos ) ); | |
| int index = x + 80 * y; | |
| if ( !( 22 > y && y > 0 && x > 0 && 80 > x && new_transform_value > transforms[ index ] ) ) continue; | |
| transforms[ index ] = new_transform_value; | |
| float x_sinuses = x_sin * step_x_sin; | |
| float left = x_sinuses - y_sin * x_cos * step_x_cos; | |
| left *= step_y_cos; | |
| float rightpt1 = y_sin * x_cos * step_x_sin; | |
| float rightpt2 = x_sin * step_x_cos; | |
| float rightpt3 = y_cos * x_cos * step_y_sin; | |
| float result = left - rightpt1 - rightpt2 - rightpt3; | |
| chars[ index ] = CHARS_MAP[ std::max( static_cast< int >( 8 * result ), 0 ) ]; | |
| } | |
| } | |
| printf( "\x1b[H" ); | |
| for ( int k = 0; ( MAX_SIZE + 1 ) > k; k++ ) | |
| putchar( k % 80 ? chars[ k ] : 10 ); | |
| step_x += 0.04f; | |
| step_y += 0.02f; | |
| } | |
| int main( ) { | |
| printf( "\x1b[2J" ); | |
| for ( ;; ) | |
| draw_donut( ); | |
| } |
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