From c695245fe792c9af02f3843d9d666d2dc46ce721 Mon Sep 17 00:00:00 2001
From: Joop Kiefte <ikojba@gmail.com>
Date: Tue, 8 Dec 2020 09:54:44 +0100
Subject: Add blinking shadow

---
 main.go | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index 4c1645b..ee472ae 100644
--- a/main.go
+++ b/main.go
@@ -33,6 +33,22 @@ func npos(l, c int, f tris.Field) {
 	}
 }
 
+func lpos(l, c int, f tris.Field) {
+	pos(l, c)
+	var line []int
+	for _, r := range f {
+		if len(line) == 0 {
+			line = r
+		}
+		for i := range line {
+			if r[i] > 0 {
+				line[i] = 5
+			}
+		}
+	}
+	ppos(l, c, render(line, "\u2591\u2591", "  "))
+}
+
 func render(r []int, block, empty string) string {
 	var s string
 	for _, c := range r {
@@ -72,6 +88,7 @@ restart:
 	rand.Seed(time.Now().UnixNano()) // to start with truly random pieces
 
 	f := tris.NewField(20, 10)                 // the playing field (10x20)
+	emptyf := tris.NewField(20, 10)                 // empty playing field (10x20)
 	var floor, topout, harddrop bool // state machine variables to check special situations
 
 	// define outside of game loop to avoid accidental resets of position
@@ -108,6 +125,7 @@ restart:
 			}
 			npos(3, 0, tris.HoldBox)
 			fpos(0, 10, f.Add(p))
+			lpos(20, 10, emptyf.Add(p))
 			var next tris.Field
 			b, next = b.Next(5)
 			npos(0, 34, next)
@@ -188,7 +206,13 @@ restart:
 				linescleared += l
 				score += 40 * level * l * l
 			}
-			fmt.Print("\007\033[2J") // Clear screen and bell
+			go func() {
+				for i := 0; i < l; i++ {
+					fmt.Print("\007")
+					time.Sleep(time.Second)
+				}
+			}()
+			fmt.Print("\033[2J") // Clear screen
 			b, p = b.Pick()      // ... and pick a new piece from the bag
 		}
 		// when not touching a piece or floor below yet, reset lock delay
-- 
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