115 lines
2.5 KiB
Go
115 lines
2.5 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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// ---------------------------------------------------------
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// EXERCISE: Ticker: Slide the Clock
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//
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// Your goal is slide the placeholders every second.
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// Please run the solution to see it in action.
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//
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//
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// THIS IS A HARD EXERCISE:
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// + It will take you days but it will be worth it.
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// + For experienced developers, this can take an hour or so.
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//
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//
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// 1. You need to determine the starting and the ending digits to create
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// the sliding effect.
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//
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//
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// 2. Each second, start from the next placeholder, skip the previous one.
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// This means: Only draw the next placeholders.
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//
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// Like this:
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//
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// 12:40:31
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// 2:40:31
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// 40:31
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// 0:31
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// :31
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// 31
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// 1
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//
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//
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// 3. After the last placeholder is displayed, fill the lines for the missing
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// placeholders, and then start from the first placeholder. Draw it to the
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// right part of the screen.
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//
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// Like this:
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//
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// 12:40:31
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// 2:40:31
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// 40:31
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// 0:31
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// :31
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// 31
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// 1
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// 1
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// 12
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// 12:
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// 12:4
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// 12:40
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// 12:40:
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// 12:40:3
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// 12:40:31
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//
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// As you can see, you need to draw the clock from the right part of the
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// screen, beginning from the first placeholder.
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//
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//
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// HINTS
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// + You would need to clear the screen inside the loop instead of once.
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// Otherwise the previous placeholders will be left on the screen.
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//
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//
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// EXPECTED OUTPUT
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// Please run the solution to see it in action. Do not look at the source-code
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// though.
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// ---------------------------------------------------------
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package main
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import (
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"fmt"
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"time"
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"github.com/inancgumus/screen"
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)
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func main() {
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screen.Clear()
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for {
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screen.MoveTopLeft()
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now := time.Now()
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hour, min, sec := now.Hour(), now.Minute(), now.Second()
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clock := [...]placeholder{
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digits[hour/10], digits[hour%10],
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colon,
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digits[min/10], digits[min%10],
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colon,
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digits[sec/10], digits[sec%10],
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}
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for line := range clock[0] {
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for index, digit := range clock {
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next := clock[index][line]
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if digit == colon && sec%2 == 0 {
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next = " "
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}
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fmt.Print(next, " ")
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}
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fmt.Println()
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}
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time.Sleep(time.Second)
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}
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}
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