68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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// For more tutorials : https://learngoprogramming.com
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// In-person training : https://www.linkedin.com/in/inancgumus/
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// Follow me on twitter: https://twitter.com/inancgumus
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package main
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import (
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"fmt"
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)
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func main() {
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const (
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width = 50
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height = 10
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cellEmpty = ' '
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cellBall = '⚾'
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)
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var cell rune // current cell (for caching)
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// create the board
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board := make([][]bool, width)
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for column := range board {
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board[column] = make([]bool, height)
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}
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// create a drawing buffer
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buf := make([]rune, 0, width*height)
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// draw a smiley
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board[12][2] = true
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board[16][2] = true
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board[14][4] = true
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board[10][6] = true
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board[18][6] = true
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board[12][7] = true
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board[14][7] = true
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board[16][7] = true
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// use the loop for measuring the performance difference
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for i := 0; i < 1000; i++ {
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// rewind the buffer so that the program reuses it
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buf = buf[:0]
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// draw the board into the buffer
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for y := range board[0] {
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for x := range board {
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cell = cellEmpty
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if board[x][y] {
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cell = cellBall
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}
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// fmt.Print(string(cell), " ")
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buf = append(buf, cell, ' ')
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}
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// fmt.Println()
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buf = append(buf, '\n')
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}
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// print the buffer
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fmt.Print(string(buf))
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}
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}
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