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main.go
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main.go
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package main
import (
"fmt"
"github.com/gen2brain/raylib-go/raylib"
)
const (
maxFrameSpeed = 15
minFrameSpeed = 1
)
func main() {
screenWidth := int32(800)
screenHeight := int32(450)
rl.InitWindow(screenWidth, screenHeight, "raylib [textures] example - texture loading and drawing")
// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
scarfy := rl.LoadTexture("scarfy.png") // Texture loading
position := rl.NewVector2(350.0, 280.0)
frameRec := rl.NewRectangle(0, 0, float32(scarfy.Width/6), float32(scarfy.Height))
currentFrame := float32(0)
framesCounter := 0
framesSpeed := 8 // Number of spritesheet frames shown by second
rl.SetTargetFPS(60)
for !rl.WindowShouldClose() {
framesCounter++
if framesCounter >= (60 / framesSpeed) {
framesCounter = 0
currentFrame++
if currentFrame > 5 {
currentFrame = 0
}
frameRec.X = currentFrame * float32(scarfy.Width) / 6
}
if rl.IsKeyPressed(rl.KeyRight) {
framesSpeed++
} else if rl.IsKeyPressed(rl.KeyLeft) {
framesSpeed--
}
if framesSpeed > maxFrameSpeed {
framesSpeed = maxFrameSpeed
} else if framesSpeed < minFrameSpeed {
framesSpeed = minFrameSpeed
}
rl.BeginDrawing()
rl.ClearBackground(rl.RayWhite)
rl.DrawTexture(scarfy, 15, 40, rl.White)
rl.DrawRectangleLines(15, 40, scarfy.Width, scarfy.Height, rl.Lime)
rl.DrawRectangleLines(15+int32(frameRec.X), 40+int32(frameRec.Y), int32(frameRec.Width), int32(frameRec.Height), rl.Red)
rl.DrawText("FRAME SPEED: ", 165, 210, 10, rl.DarkGray)
rl.DrawText(fmt.Sprintf("%02d FPS", framesSpeed), 575, 210, 10, rl.DarkGray)
rl.DrawText("PRESS RIGHT/LEFT KEYS to CHANGE SPEED!", 290, 240, 10, rl.DarkGray)
for i := 0; i < maxFrameSpeed; i++ {
if i < framesSpeed {
rl.DrawRectangle(int32(250+21*i), 205, 20, 20, rl.Red)
}
rl.DrawRectangleLines(int32(250+21*i), 205, 20, 20, rl.Maroon)
}
rl.DrawTextureRec(scarfy, frameRec, position, rl.White) // Draw part of the texture
rl.DrawText("(c) Scarfy sprite by Eiden Marsal", screenWidth-200, screenHeight-20, 10, rl.Gray)
rl.EndDrawing()
}
rl.UnloadTexture(scarfy)
rl.CloseWindow()
}