ebiten/examples/platformer/main.go

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// 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"
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"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
)
const (
// Settings
width = 1024
height = 512
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)
var (
loadedSprite *ebiten.Image
leftSprite *ebiten.Image
rightSprite *ebiten.Image
idleSprite *ebiten.Image
backgroundImage *ebiten.Image
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charX = 50
charY = 380
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)
func update(screen *ebiten.Image) error {
// Controls
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if ebiten.IsKeyPressed(ebiten.KeyA) || ebiten.IsKeyPressed(ebiten.KeyLeft) {
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// Selects preloaded sprite
loadedSprite = leftSprite
// Moves character 3px right
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charX -= 3
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} else if ebiten.IsKeyPressed(ebiten.KeyD) || ebiten.IsKeyPressed(ebiten.KeyRight) {
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// Selects preloaded sprite
loadedSprite = rightSprite
// Moves character 3px left
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charX += 3
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} else {
loadedSprite = idleSprite
}
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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)
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// FPS counter
fps := fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())
ebitenutil.DebugPrint(screen, fps)
return nil
}
func main() {
// Preload images
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var err error
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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)
}
// Starts the program
if err := ebiten.Run(update, width, height, 1, "Platformer (Ebiten Demo)"); err != nil {
panic(err)
}
}