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layer.go
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layer.go
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// Copyright 2012 Lightpoke. All rights reserved.
// This source code is subject to the terms and
// conditions defined in the "License.txt" file.
package tmx
import (
"fmt"
)
type xmlLayer struct {
Name string `xml:"name,attr"`
Opacity float64 `xml:"opacity,attr"`
Visible int `xml:"visible,attr"`
Data xmlData `xml:"data"`
}
func (x xmlLayer) toLayer(width, height int) (*Layer, error) {
tiles, err := x.Data.tiles(width, height)
if err != nil {
return nil, err
}
return &Layer{
Name: x.Name,
Opacity: x.Opacity,
Visible: x.Visible != 0,
Tiles: tiles,
}, nil
}
// Coord represents a single 2D coordinate pair (x, y)
type Coord struct {
X, Y int
}
// Layer represents a single map layer and all of it's tiles
type Layer struct {
// The name of the layer.
Name string
// Value between 0 and 1 representing the opacity of the layer.
Opacity float64
// Boolean value representing whether or not the layer is visible.
Visible bool
// A map of 2D coordinates in this layer to so called "global tile IDs"
// (gids).
//
// 2D coordinates whose gid's are zero (I.e. 'no tile') are not stored in
// the map for efficiency reasons (as a good majority are zero).
//
// gids are global, since they may refere to a tile from any of the
// tilesets used by the map. In order to find out from which tileset the
// tile is you need to find the tileset with the highest Firstgid that is
// still lower or equal than the gid. The tilesets are always stored with
// increasing firstgids.
Tiles map[Coord]uint32
}
// String returns a string representation of this layer.
func (l *Layer) String() string {
return fmt.Sprintf("Layer(Name=%q, Opacity=%1.f, Visible=%v)", l.Name, l.Opacity, l.Visible)
}