ebiten/examples/mascot/main.go

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// Copyright 2020 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.
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//go:build example
// Mascot is a desktop mascot on cross platforms.
// This is inspired by mattn's gopher (https://github.com/mattn/gopher).
package main
import (
"bytes"
"image"
_ "image/png"
"log"
"math/rand"
"time"
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"github.com/hajimehoshi/ebiten/v2"
rmascot "github.com/hajimehoshi/ebiten/v2/examples/resources/images/mascot"
)
const (
width = 200
height = 200
)
var (
gopher1 *ebiten.Image
gopher2 *ebiten.Image
gopher3 *ebiten.Image
)
func init() {
// Decode an image from the image file's byte slice.
img1, _, err := image.Decode(bytes.NewReader(rmascot.Out01_png))
if err != nil {
log.Fatal(err)
}
gopher1 = ebiten.NewImageFromImage(img1)
img2, _, err := image.Decode(bytes.NewReader(rmascot.Out02_png))
if err != nil {
log.Fatal(err)
}
gopher2 = ebiten.NewImageFromImage(img2)
img3, _, err := image.Decode(bytes.NewReader(rmascot.Out03_png))
if err != nil {
log.Fatal(err)
}
gopher3 = ebiten.NewImageFromImage(img3)
}
func init() {
rand.Seed(time.Now().UnixNano())
}
type mascot struct {
x16 int
y16 int
vx16 int
vy16 int
count int
}
func (m *mascot) Layout(outsideWidth, outsideHeight int) (int, int) {
return width, height
}
func (m *mascot) Update() error {
m.count++
sw, sh := ebiten.ScreenSizeInFullscreen()
ebiten.SetWindowPosition(m.x16/16, m.y16/16+sh-height)
if m.vx16 == 0 {
m.vx16 = 64
}
m.x16 += m.vx16
if m.x16/16 > sw-width && m.vx16 > 0 {
m.vx16 = -64
}
if m.x16 <= 0 && m.vx16 < 0 {
m.vx16 = 64
}
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// Accelerate the mascot in the Y direction.
m.vy16 += 8
m.y16 += m.vy16
// If the mascot is on the ground, stop it in the Y direction.
if m.y16 >= 0 {
m.y16 = 0
m.vy16 = 0
}
// If the mascto is on the ground, cause an action in random.
if rand.Intn(60) == 0 && m.y16 == 0 {
switch rand.Intn(2) {
case 0:
// Jump.
m.vy16 = -240
case 1:
// Turn.
m.vx16 = -m.vx16
}
}
return nil
}
func (m *mascot) Draw(screen *ebiten.Image) {
img := gopher1
if m.y16 == 0 {
switch (m.count / 3) % 4 {
case 0:
img = gopher1
case 1, 3:
img = gopher2
case 2:
img = gopher3
}
}
op := &ebiten.DrawImageOptions{}
if m.vx16 < 0 {
op.GeoM.Scale(-1, 1)
op.GeoM.Translate(width, 0)
}
screen.DrawImage(img, op)
}
func main() {
ebiten.SetScreenTransparent(true)
ebiten.SetWindowDecorated(false)
ebiten.SetWindowFloating(true)
ebiten.SetWindowSize(width, height)
if err := ebiten.RunGame(&mascot{}); err != nil {
log.Fatal(err)
}
}