mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
132 lines
2.6 KiB
Go
132 lines
2.6 KiB
Go
// Copyright 2015 Hajime Hoshi
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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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package main
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import (
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"fmt"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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_ "image/png"
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"log"
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"math/rand"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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ebitenImage *ebiten.Image
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)
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type Sprite struct {
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image *ebiten.Image
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x int
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y int
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vx int
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vy int
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}
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func (s *Sprite) Update() {
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s.x += s.vx
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s.y += s.vy
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if s.x < 0 {
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s.x = -s.x
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s.vx = -s.vx
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}
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if s.y < 0 {
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s.y = -s.y
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s.vy = -s.vy
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}
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w, h := s.image.Size()
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if screenWidth <= s.x+w {
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s.x = 2*(screenWidth-w) - s.x
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s.vx = -s.vx
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}
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if screenHeight <= s.y+h {
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s.y = 2*(screenHeight-h) - s.y
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s.vy = -s.vy
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}
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}
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func (s *Sprite) Dst() (x0, y0, x1, y1 int) {
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w, h := s.image.Size()
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return s.x, s.y, s.x + w, s.y + h
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}
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func (s *Sprite) Src() (x0, y0, x1, y1 int) {
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w, h := s.image.Size()
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return 0, 0, w, h
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}
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type Sprites []*Sprite
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func (s Sprites) Update() {
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for _, sprite := range s {
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sprite.Update()
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}
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}
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func (s Sprites) Len() int {
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return len(s)
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}
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func (s Sprites) Dst(i int) (x0, y0, x1, y1 int) {
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return s[i].Dst()
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}
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func (s Sprites) Src(i int) (x0, y0, x1, y1 int) {
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return s[i].Src()
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}
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var sprites = make(Sprites, 2500)
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func update(screen *ebiten.Image) error {
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sprites.Update()
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op := &ebiten.DrawImageOptions{
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ImageParts: sprites,
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}
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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if err := screen.DrawImage(ebitenImage, op); err != nil {
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return err
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}
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ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f\nNum of sprites: %d", ebiten.CurrentFPS(), sprites.Len()))
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return nil
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}
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func main() {
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var err error
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ebitenImage, _, err = ebitenutil.NewImageFromFile("images/ebiten.png", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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for i, _ := range sprites {
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w, h := ebitenImage.Size()
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x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
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vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
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sprites[i] = &Sprite{
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image: ebitenImage,
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x: x,
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y: y,
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vx: vx,
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vy: vy,
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}
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Sprites (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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