mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
156 lines
3.2 KiB
Go
156 lines
3.2 KiB
Go
// Copyright 2020 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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//go:build example
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// +build example
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// Mascot is a desktop mascot on cross platforms.
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// This is inspired by mattn's gopher (https://github.com/mattn/gopher).
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package main
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import (
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"bytes"
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"image"
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_ "image/png"
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"log"
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"math/rand"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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rmascot "github.com/hajimehoshi/ebiten/v2/examples/resources/images/mascot"
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)
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const (
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width = 200
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height = 200
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)
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var (
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gopher1 *ebiten.Image
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gopher2 *ebiten.Image
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gopher3 *ebiten.Image
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)
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func init() {
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// Decode an image from the image file's byte slice.
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// Now the byte slice is generated with //go:generate for Go 1.15 or older.
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// If you use Go 1.16 or newer, it is strongly recommended to use //go:embed to embed the image file.
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// See https://pkg.go.dev/embed for more details.
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img1, _, err := image.Decode(bytes.NewReader(rmascot.Out01_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher1 = ebiten.NewImageFromImage(img1)
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img2, _, err := image.Decode(bytes.NewReader(rmascot.Out02_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher2 = ebiten.NewImageFromImage(img2)
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img3, _, err := image.Decode(bytes.NewReader(rmascot.Out03_png))
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if err != nil {
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log.Fatal(err)
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}
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gopher3 = ebiten.NewImageFromImage(img3)
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}
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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type mascot struct {
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x16 int
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y16 int
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vx16 int
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vy16 int
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count int
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}
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func (m *mascot) Layout(outsideWidth, outsideHeight int) (int, int) {
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return width, height
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}
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func (m *mascot) Update() error {
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m.count++
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sw, sh := ebiten.ScreenSizeInFullscreen()
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ebiten.SetWindowPosition(m.x16/16, m.y16/16+sh-height)
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if m.vx16 == 0 {
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m.vx16 = 64
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}
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m.x16 += m.vx16
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if m.x16/16 > sw-width && m.vx16 > 0 {
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m.vx16 = -64
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}
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if m.x16 <= 0 && m.vx16 < 0 {
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m.vx16 = 64
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}
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// Accelarate the mascot in the Y direction.
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m.vy16 += 8
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m.y16 += m.vy16
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// If the mascot is on the ground, stop it in the Y direction.
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if m.y16 >= 0 {
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m.y16 = 0
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m.vy16 = 0
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}
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// If the mascto is on the ground, cause an action in random.
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if rand.Intn(60) == 0 && m.y16 == 0 {
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switch rand.Intn(2) {
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case 0:
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// Jump.
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m.vy16 = -240
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case 1:
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// Turn.
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m.vx16 = -m.vx16
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}
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}
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return nil
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}
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func (m *mascot) Draw(screen *ebiten.Image) {
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img := gopher1
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if m.y16 == 0 {
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switch (m.count / 3) % 4 {
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case 0:
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img = gopher1
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case 1, 3:
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img = gopher2
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case 2:
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img = gopher3
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}
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}
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op := &ebiten.DrawImageOptions{}
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if m.vx16 < 0 {
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op.GeoM.Scale(-1, 1)
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op.GeoM.Translate(width, 0)
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}
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screen.DrawImage(img, op)
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}
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func main() {
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ebiten.SetScreenTransparent(true)
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ebiten.SetWindowDecorated(false)
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ebiten.SetWindowFloating(true)
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ebiten.SetWindowSize(width, height)
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if err := ebiten.RunGame(&mascot{}); err != nil {
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log.Fatal(err)
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}
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}
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