ebiten/examples/isometric/level.go

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// Copyright 2021 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.
//go:build example
// +build example
package main
import (
"fmt"
"math/rand"
"time"
)
// Level represents a Game level.
type Level struct {
w, h int
tiles [][]*Tile // (Y,X) array of tiles
tileSize int
}
// Tile returns the tile at the provided coordinates, or nil.
func (l *Level) Tile(x, y int) *Tile {
if x >= 0 && y >= 0 && x < l.w && y < l.h {
return l.tiles[y][x]
}
return nil
}
// Size returns the size of the Level.
func (l *Level) Size() (width, height int) {
return l.w, l.h
}
// NewLevel returns a new randomly generated Level.
func NewLevel() (*Level, error) {
// Create a 108x108 Level.
l := &Level{
w: 108,
h: 108,
tileSize: 64,
}
// Load embedded SpriteSheet.
ss, err := LoadSpriteSheet(l.tileSize)
if err != nil {
return nil, fmt.Errorf("failed to load embedded spritesheet: %s", err)
}
// Generate a unique permutation each time.
r := rand.New(rand.NewSource(time.Now().UTC().UnixNano()))
// Fill each tile with one or more sprites randomly.
l.tiles = make([][]*Tile, l.h)
for y := 0; y < l.h; y++ {
l.tiles[y] = make([]*Tile, l.w)
for x := 0; x < l.w; x++ {
t := &Tile{}
isBorderSpace := x == 0 || y == 0 || x == l.w-1 || y == l.h-1
val := r.Intn(1000)
switch {
case isBorderSpace || val < 275:
t.AddSprite(ss.Wall)
case val < 285:
t.AddSprite(ss.Statue)
case val < 288:
t.AddSprite(ss.Crown)
case val < 289:
t.AddSprite(ss.Floor)
t.AddSprite(ss.Tube)
case val < 290:
t.AddSprite(ss.Portal)
default:
t.AddSprite(ss.Floor)
}
l.tiles[y][x] = t
}
}
return l, nil
}