ebiten/examples/flood/main.go
2018-03-16 12:05:53 +09:00

106 lines
2.6 KiB
Go

// 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.
// +build example jsgo
package main
import (
"bytes"
"image"
"image/color"
_ "image/png"
"log"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/examples/resources/images"
)
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},
}
)
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
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))
// Reset RGB (not Alpha) 0 forcibly
op.ColorM.Scale(0, 0, 0, 1)
// Set color
r := float64(c.R) / 0xff
g := float64(c.G) / 0xff
b := float64(c.B) / 0xff
op.ColorM.Translate(r, g, b, 0)
screen.DrawImage(ebitenImage, op)
}
return nil
}
func main() {
// Decode image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn't work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
if err != nil {
log.Fatal(err)
}
ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Flood fill with solid colors (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}