From 14b0f48aff4af0863734ff249ca37b444e03c3bb Mon Sep 17 00:00:00 2001
From: Zykatious <30608121+Zykatious@users.noreply.github.com>
Date: Thu, 23 Nov 2017 23:52:50 +0000
Subject: [PATCH] Create life.go

---
 examples/games/life/life.go | 190 ++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 examples/games/life/life.go

diff --git a/examples/games/life/life.go b/examples/games/life/life.go
new file mode 100644
index 0000000..192792c
--- /dev/null
+++ b/examples/games/life/life.go
@@ -0,0 +1,190 @@
+package main
+
+import (
+	"math/rand"
+	"time"
+
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+const (
+	squareSize = 8
+)
+
+// Cell type
+type Cell struct {
+	Position raylib.Vector2
+	Size     raylib.Vector2
+	Alive    bool
+	Next     bool
+	Visited  bool
+}
+
+// Game type
+type Game struct {
+	ScreenWidth   int32
+	ScreenHeight  int32
+	FramesCounter int32
+	Playing       bool
+	Cells         [][]*Cell
+}
+
+func main() {
+	game := Game{}
+	game.Init()
+	raylib.InitWindow(game.ScreenWidth, game.ScreenHeight, "Conway's Game of Life")
+	raylib.SetTargetFPS(20)
+	for !raylib.WindowShouldClose() {
+		if game.Playing {
+			game.Update()
+		}
+		game.Input()
+
+		game.Draw()
+	}
+	raylib.CloseWindow()
+}
+
+// Init - Initialize game
+func (g *Game) Init() {
+	g.ScreenWidth = 1024
+	g.ScreenHeight = 768
+	g.FramesCounter = 0
+
+	g.Cells = make([][]*Cell, g.ScreenWidth/squareSize+1)
+	for i := int32(0); i <= g.ScreenWidth/squareSize; i++ {
+		g.Cells[i] = make([]*Cell, g.ScreenHeight/squareSize+1)
+	}
+
+	for x := int32(0); x <= g.ScreenWidth/squareSize; x++ {
+		for y := int32(0); y <= g.ScreenHeight/squareSize; y++ {
+			g.Cells[x][y] = &Cell{}
+			g.Cells[x][y].Position = raylib.NewVector2((float32(x) * squareSize), (float32(y)*squareSize)+1)
+			g.Cells[x][y].Size = raylib.NewVector2(squareSize-1, squareSize-1)
+			rand.Seed(time.Now().UnixNano())
+			if rand.Float64() < 0.1 {
+				g.Cells[x][y].Alive = true
+			}
+		}
+	}
+}
+
+// Input - Game input
+func (g *Game) Input() {
+	// control
+	if raylib.IsKeyPressed(raylib.KeyR) {
+		g.Init()
+	}
+	if raylib.IsKeyDown(raylib.KeyRight) && !g.Playing {
+		g.Update()
+	}
+	if raylib.IsKeyPressed(raylib.KeySpace) {
+		g.Playing = !g.Playing
+	}
+
+	g.FramesCounter++
+}
+
+// Update - Update game
+func (g *Game) Update() {
+	for i := int32(0); i <= g.ScreenWidth/squareSize; i++ {
+		for j := int32(0); j <= g.ScreenHeight/squareSize; j++ {
+			NeighbourCount := 0
+			if j-1 >= 0 {
+				if g.Cells[i][j-1].Alive {
+					NeighbourCount++
+				}
+			}
+			if j+1 <= g.ScreenHeight/squareSize {
+				if g.Cells[i][j+1].Alive {
+					NeighbourCount++
+				}
+			}
+			if i-1 >= 0 {
+				if g.Cells[i-1][j].Alive {
+					NeighbourCount++
+				}
+			}
+			if i+1 <= g.ScreenWidth/squareSize {
+				if g.Cells[i+1][j].Alive {
+					NeighbourCount++
+				}
+			}
+			if i-1 >= 0 && j-1 >= 0 {
+				if g.Cells[i-1][j-1].Alive {
+					NeighbourCount++
+				}
+			}
+			if i-1 >= 0 && j+1 <= g.ScreenHeight/squareSize {
+				if g.Cells[i-1][j+1].Alive {
+					NeighbourCount++
+				}
+			}
+			if i+1 <= g.ScreenWidth/squareSize && j-1 >= 0 {
+				if g.Cells[i+1][j-1].Alive {
+					NeighbourCount++
+				}
+			}
+			if i+1 <= g.ScreenWidth/squareSize && j+1 <= g.ScreenHeight/squareSize {
+				if g.Cells[i+1][j+1].Alive {
+					NeighbourCount++
+				}
+			}
+			if g.Cells[i][j].Alive {
+				if NeighbourCount < 2 {
+					g.Cells[i][j].Next = false
+				} else if NeighbourCount > 3 {
+					g.Cells[i][j].Next = false
+				} else {
+					g.Cells[i][j].Next = true
+				}
+			} else {
+				if NeighbourCount == 3 {
+					g.Cells[i][j].Next = true
+					g.Cells[i][j].Visited = true
+				}
+			}
+		}
+	}
+	for i := int32(0); i <= g.ScreenWidth/squareSize; i++ {
+		for j := int32(0); j < g.ScreenHeight/squareSize; j++ {
+			g.Cells[i][j].Alive = g.Cells[i][j].Next
+		}
+	}
+}
+
+// Draw - Draw game
+func (g *Game) Draw() {
+	raylib.BeginDrawing()
+	raylib.ClearBackground(raylib.RayWhite)
+
+	// Draw cells
+	for x := int32(0); x <= g.ScreenWidth/squareSize; x++ {
+		for y := int32(0); y <= g.ScreenHeight/squareSize; y++ {
+			if g.Cells[x][y].Alive {
+				raylib.DrawRectangleV(g.Cells[x][y].Position, g.Cells[x][y].Size, raylib.Blue)
+			} else if g.Cells[x][y].Visited {
+				raylib.DrawRectangleV(g.Cells[x][y].Position, g.Cells[x][y].Size, raylib.Color{R: 128, G: 177, B: 136, A: 255})
+			}
+		}
+	}
+
+	// Draw grid lines
+	for i := int32(0); i < g.ScreenWidth/squareSize+1; i++ {
+		raylib.DrawLineV(
+			raylib.NewVector2(float32(squareSize*i), 0),
+			raylib.NewVector2(float32(squareSize*i), float32(g.ScreenHeight)),
+			raylib.LightGray,
+		)
+	}
+
+	for i := int32(0); i < g.ScreenHeight/squareSize+1; i++ {
+		raylib.DrawLineV(
+			raylib.NewVector2(0, float32(squareSize*i)),
+			raylib.NewVector2(float32(g.ScreenWidth), float32(squareSize*i)),
+			raylib.LightGray,
+		)
+	}
+
+	raylib.EndDrawing()
+}