ebiten/examples/flood/main.go

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// Copyright 2018 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
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// +build example
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package main
import (
"bytes"
"image"
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"image/color"
_ "image/png"
"log"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
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)
const (
screenWidth = 320
screenHeight = 240
)
var (
ebitenImage *ebiten.Image
colors = []color.RGBA{
{0xff, 0xff, 0xff, 0xff},
{0xff, 0xff, 0x0, 0xff},
{0xff, 0x0, 0xff, 0xff},
{0xff, 0x0, 0x0, 0xff},
{0x0, 0xff, 0xff, 0xff},
{0x0, 0xff, 0x0, 0xff},
{0x0, 0x0, 0xff, 0xff},
{0x0, 0x0, 0x0, 0xff},
}
)
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type Game struct {
}
func (g *Game) Update() error {
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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const (
ox = 10
oy = 10
dx = 60
dy = 50
)
screen.Fill(color.NRGBA{0x00, 0x40, 0x80, 0xff})
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(ox, oy)
screen.DrawImage(ebitenImage, op)
// Fill with solid colors
for i, c := range colors {
op := &ebiten.DrawImageOptions{}
x := i % 4
y := i/4 + 1
op.GeoM.Translate(ox+float64(dx*x), oy+float64(dy*y))
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// Reset RGB (not Alpha) 0 forcibly
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op.ColorM.Scale(0, 0, 0, 1)
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// Set color
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r := float64(c.R) / 0xff
g := float64(c.G) / 0xff
b := float64(c.B) / 0xff
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op.ColorM.Translate(r, g, b, 0)
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screen.DrawImage(ebitenImage, op)
}
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
// Decode an image from the image file's byte slice.
// 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.
// See https://pkg.go.dev/embed for more details.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
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if err != nil {
log.Fatal(err)
}
ebitenImage = ebiten.NewImageFromImage(img)
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ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Flood fill with solid colors (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}