ebiten/examples/platformer/main.go
2018-01-30 03:57:07 +09:00

109 lines
2.6 KiB
Go

// Copyright 2017 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build example
package main
import (
"fmt"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
)
const (
// Settings
screenWidth = 1024
screenHeight = 512
)
var (
loadedSprite *ebiten.Image
leftSprite *ebiten.Image
rightSprite *ebiten.Image
idleSprite *ebiten.Image
backgroundImage *ebiten.Image
)
func init() {
// Preload images
var err error
rightSprite, _, err = ebitenutil.NewImageFromFile("_resources/images/platformer/right.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
leftSprite, _, err = ebitenutil.NewImageFromFile("_resources/images/platformer/left.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
idleSprite, _, err = ebitenutil.NewImageFromFile("_resources/images/platformer/mainchar.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
backgroundImage, _, err = ebitenutil.NewImageFromFile("_resources/images/platformer/background.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
}
var (
charX = 50
charY = 380
)
func update(screen *ebiten.Image) error {
// Controls
if ebiten.IsKeyPressed(ebiten.KeyA) || ebiten.IsKeyPressed(ebiten.KeyLeft) {
// Selects preloaded sprite
loadedSprite = leftSprite
// Moves character 3px right
charX -= 3
} else if ebiten.IsKeyPressed(ebiten.KeyD) || ebiten.IsKeyPressed(ebiten.KeyRight) {
// Selects preloaded sprite
loadedSprite = rightSprite
// Moves character 3px left
charX += 3
} else {
loadedSprite = idleSprite
}
if ebiten.IsRunningSlowly() {
return nil
}
// Draws Background Image
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(0.5, 0.5)
screen.DrawImage(backgroundImage, op)
// Draws selected sprite image
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(0.5, 0.5)
op.GeoM.Translate(float64(charX), float64(charY))
screen.DrawImage(loadedSprite, op)
// FPS counter
fps := fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())
ebitenutil.DebugPrint(screen, fps)
return nil
}
func main() {
if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Platformer (Ebiten Demo)"); err != nil {
panic(err)
}
}