mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build example jsgo
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package main
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import (
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"bytes"
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"fmt"
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"image"
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_ "image/png"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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rplatformer "github.com/hajimehoshi/ebiten/examples/resources/images/platformer"
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)
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const (
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// Settings
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screenWidth = 1024
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screenHeight = 512
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)
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var (
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loadedSprite *ebiten.Image
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leftSprite *ebiten.Image
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rightSprite *ebiten.Image
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idleSprite *ebiten.Image
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backgroundImage *ebiten.Image
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)
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func init() {
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// Preload images
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img, _, err := image.Decode(bytes.NewReader(rplatformer.Right_png))
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if err != nil {
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panic(err)
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}
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rightSprite, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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img, _, err = image.Decode(bytes.NewReader(rplatformer.Left_png))
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if err != nil {
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panic(err)
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}
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leftSprite, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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img, _, err = image.Decode(bytes.NewReader(rplatformer.MainChar_png))
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if err != nil {
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panic(err)
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}
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idleSprite, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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img, _, err = image.Decode(bytes.NewReader(rplatformer.Background_png))
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if err != nil {
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panic(err)
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}
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backgroundImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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}
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var (
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charX = 50
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charY = 380
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)
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func update(screen *ebiten.Image) error {
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// Controls
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if ebiten.IsKeyPressed(ebiten.KeyA) || ebiten.IsKeyPressed(ebiten.KeyLeft) {
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// Selects preloaded sprite
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loadedSprite = leftSprite
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// 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
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loadedSprite = rightSprite
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// Moves character 3px left
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charX += 3
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} else {
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loadedSprite = idleSprite
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}
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if ebiten.IsDrawingSkipped() {
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return nil
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}
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// Draws Background Image
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Scale(0.5, 0.5)
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screen.DrawImage(backgroundImage, op)
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// Draws selected sprite image
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op = &ebiten.DrawImageOptions{}
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op.GeoM.Scale(0.5, 0.5)
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op.GeoM.Translate(float64(charX), float64(charY))
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screen.DrawImage(loadedSprite, op)
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// FPS counter
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fps := fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())
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ebitenutil.DebugPrint(screen, fps)
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Platformer (Ebiten Demo)"); err != nil {
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panic(err)
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}
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}
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