added raylib logo animation

examples/core/raylib_logoanim/main.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func main() {
+	// Initialization
+	//--------------------------------------------------------------------------------------
+	const screenWidth = 800
+	const screenHeight = 450
+
+	rl.InitWindow(screenWidth, screenHeight, "raylib [shapes] example - raylib logo animation")
+
+	var logoPositionX int32 = screenWidth/2 - 128
+	var logoPositionY int32 = screenHeight/2 - 128
+
+	framesCounter := 0
+	lettersCount := 0
+
+	var topSideRecWidth int32 = 16
+	var leftSideRecHeight int32 = 16
+
+	var bottomSideRecWidth int32 = 16
+	var rightSideRecHeight int32 = 16
+
+	state := 0            // Tracking animation states (State Machine)
+	alpha := float32(1.0) // Useful for fading
+
+	rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second
+	//--------------------------------------------------------------------------------------
+
+	// Main game loop
+	for !rl.WindowShouldClose() { // Detect window close button or ESC key
+		// Update
+		//----------------------------------------------------------------------------------
+		if state == 0 { // State 0: Small box blinking
+			framesCounter++
+
+			if framesCounter == 120 {
+				state = 1
+				framesCounter = 0 // Reset counter... will be used later...
+			}
+		} else if state == 1 { // State 1: Top and left bars growing
+			topSideRecWidth += 4
+			leftSideRecHeight += 4
+
+			if topSideRecWidth == 256 {
+				state = 2
+			}
+		} else if state == 2 { // State 2: Bottom and right bars growing
+			bottomSideRecWidth += 4
+			rightSideRecHeight += 4
+
+			if bottomSideRecWidth == 256 {
+				state = 3
+			}
+		} else if state == 3 { // State 3: Letters appearing (one by one)
+			framesCounter++
+
+			if framesCounter%12 == 0 { // Every 12 frames, one more letter!
+				lettersCount++
+				framesCounter = 0
+			}
+
+			if lettersCount >= 10 { // When all letters have appeared, just fade out everything
+				alpha -= 0.02
+
+				if alpha <= 0.0 {
+					alpha = 0.0
+					state = 4
+				}
+			}
+		} else if state == 4 { // State 4: Reset and Replay
+			if rl.IsKeyPressed(rl.KeyR) {
+				framesCounter = 0
+				lettersCount = 0
+
+				topSideRecWidth = 16
+				leftSideRecHeight = 16
+
+				bottomSideRecWidth = 16
+				rightSideRecHeight = 16
+
+				alpha = 1.0
+				state = 0 // Return to State 0
+			}
+		}
+		//----------------------------------------------------------------------------------
+
+		// Draw
+		//----------------------------------------------------------------------------------
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		if state == 0 {
+			if (framesCounter/15)%2 == 1 {
+				rl.DrawRectangle(logoPositionX, logoPositionY, 16, 16, rl.Black)
+			}
+		} else if state == 1 {
+			rl.DrawRectangle(logoPositionX, logoPositionY, topSideRecWidth, 16, rl.Black)
+			rl.DrawRectangle(logoPositionX, logoPositionY, 16, leftSideRecHeight, rl.Black)
+		} else if state == 2 {
+			rl.DrawRectangle(logoPositionX, logoPositionY, topSideRecWidth, 16, rl.Black)
+			rl.DrawRectangle(logoPositionX, logoPositionY, 16, leftSideRecHeight, rl.Black)
+
+			rl.DrawRectangle(logoPositionX+240, logoPositionY, 16, rightSideRecHeight, rl.Black)
+			rl.DrawRectangle(logoPositionX, logoPositionY+240, bottomSideRecWidth, 16, rl.Black)
+		} else if state == 3 {
+			rl.DrawRectangle(logoPositionX, logoPositionY, topSideRecWidth, 16, rl.Fade(rl.Black, alpha))
+			rl.DrawRectangle(logoPositionX, logoPositionY+16, 16, leftSideRecHeight-32, rl.Fade(rl.Black, alpha))
+
+			rl.DrawRectangle(logoPositionX+240, logoPositionY+16, 16, rightSideRecHeight-32, rl.Fade(rl.Black, alpha))
+			rl.DrawRectangle(logoPositionX, logoPositionY+240, bottomSideRecWidth, 16, rl.Fade(rl.Black, alpha))
+
+			rl.DrawRectangle(screenWidth/2-112, screenHeight/2-112, 224, 224, rl.Fade(rl.RayWhite, alpha))
+
+			rl.DrawText("raylib", screenWidth/2-44, screenHeight/2+48, 50, rl.Fade(rl.Black, alpha))
+		} else if state == 4 {
+			rl.DrawText("[R] REPLAY", 340, 200, 20, rl.Gray)
+		}
+
+		rl.EndDrawing()
+		//----------------------------------------------------------------------------------
+	}
+
+	// De-Initialization
+	//--------------------------------------------------------------------------------------
+	rl.CloseWindow() // Close window and OpenGL context
+	//--------------------------------------------------------------------------------------
+}