mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// Copyright 2016 Hajime Hoshi
|
|
//
|
|
// 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
|
|
|
|
package main
|
|
|
|
import (
|
|
"image/color"
|
|
_ "image/png"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
ebitenImage *ebiten.Image
|
|
)
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
|
|
const (
|
|
// The offset point to render the image.
|
|
ox = 10
|
|
oy = 10
|
|
)
|
|
|
|
screen.Fill(color.NRGBA{0x00, 0x40, 0x80, 0xff})
|
|
|
|
// Draw the image with 'Source Alpha' composite mode (default).
|
|
op := &ebiten.DrawImageOptions{}
|
|
op.GeoM.Translate(ox, oy)
|
|
screen.DrawImage(ebitenImage, op)
|
|
|
|
// Draw the image with 'Lighter (a.k.a Additive)' composite mode.
|
|
op = &ebiten.DrawImageOptions{}
|
|
w, _ := ebitenImage.Size()
|
|
op.GeoM.Translate(ox+float64(w), oy)
|
|
op.CompositeMode = ebiten.CompositeModeLighter
|
|
screen.DrawImage(ebitenImage, op)
|
|
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.png", ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Additive Blending (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|