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object.go
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object.go
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// Copyright 2014 Lightpoke. All rights reserved.
// This source code is subject to the terms and
// conditions defined in the "License.txt" file.
package tmx
import (
"fmt"
"strconv"
"strings"
)
// Ellipse represents an ellipse object, found in the Object.Value field.
type Ellipse struct {
// The position and size of the ellipse.
//
// These values are identical to the parent object's fields of the same
// name, they are only provided for convenience.
X, Y, Width, Height int
}
// Point represents a single point.
type Point struct {
X, Y int
}
// Polygon represents a polygon object, found in the Object.Value field.
type Polygon struct {
// The position/origin of the polygon.
//
// These values are identical to the parent object's fields of the same
// name, they are only provided for convenience.
X, Y int
// Points making up the polygon, in pixels.
Points []Point
}
// Polyline represents a polyline object, found in the Object.Value field.
type Polyline struct {
// The position/origin of the polyline.
//
// These values are identical to the parent object's fields of the same
// name, they are only provided for convenience.
X, Y int
// Points making up the polyline, in pixels.
Points []Point
}
// Polygon and Polyset are identical, we share definitions here.
type xmlPolyset struct {
Data string `xml:"points,attr"`
}
func (x xmlPolyset) toPoints() (points []Point) {
pairs := strings.Split(x.Data, " ")
points = make([]Point, 0, len(pairs))
for _, pair := range pairs {
xy := strings.Split(strings.TrimSpace(pair), ",")
if len(xy) == 2 {
x, _ := strconv.Atoi(strings.TrimSpace(xy[0]))
y, _ := strconv.Atoi(strings.TrimSpace(xy[1]))
points = append(points, Point{
X: x,
Y: y,
})
}
}
return points
}
type xmlObject struct {
Name string `xml:"name,attr"`
Type string `xml:"type,attr"`
X int `xml:"x,attr"`
Y int `xml:"y,attr"`
Width int `xml:"width,attr"`
Height int `xml:"height,attr"`
Rotation float64 `xml:"rotation,attr"`
Gid int `xml:"gid,attr"`
Visible int `xml:"visible,attr"`
Properties xmlProperties `xml:"properties"`
Ellipse *string `xml:"ellipse"`
Polygon xmlPolyset `xml:"polygon"`
Polyline xmlPolyset `xml:"polyline"`
// FIXME: alledgedly, object tags can have images under them, but it's not
// clear what that would mean. There also is no way to create one in
// Tiled-Qt that I can find anywhere. My guess: it's not supposed to be
// there at all and none actually have them.
}
func (x xmlObject) toValue() interface{} {
if x.Ellipse != nil {
return &Ellipse{
X: x.X,
Y: x.Y,
Width: x.Width,
Height: x.Height,
}
}
if len(x.Polygon.Data) > 0 {
return &Polygon{
X: x.X,
Y: x.Y,
Points: x.Polygon.toPoints(),
}
}
if len(x.Polyline.Data) > 0 {
return &Polyline{
X: x.X,
Y: x.Y,
Points: x.Polyline.toPoints(),
}
}
return nil
}
func (x xmlObject) toObject() *Object {
return &Object{
Name: x.Name,
Type: x.Type,
X: x.X,
Y: x.Y,
Width: x.Width,
Height: x.Height,
Rotation: x.Rotation,
Gid: uint32(x.Gid),
Visible: x.Visible != 0,
Properties: x.Properties.toMap(),
Value: x.toValue(),
}
}
// Object represents a single object, which are generally used to add custom
// information to tile maps, like collision information, spawn points, etc.
type Object struct {
// The name of this object.
Name string
// The type of this object, which is an arbitrary string.
Type string
// The X and Y coordinates, as well as the width and height of this object
// in pixels.
X, Y, Width, Height int
// The rotation of this object in degrees clockwise.
Rotation float64
// Reference to a tile (optional). If it is non-zero then this object is
// represented by the image of the tile with this global ID. Currently that
// means width and height are ignored for such objects. The image alignment
// currently depends on the map orientation:
// Orthogonal - Aligned to the bottom-left
// Isometric - Aligned to the bottom-center
Gid uint32
// Boolean value representing whether or not the object group is visible.
Visible bool
// Map of properties for this object group.
Properties map[string]string
// Value represents the underlying object value (which is sometimes nil).
// You can use a type switch to determine it's value:
// switch v := obj.Value.(type) {
// case *tmx.Ellipse: handleEllipse(obj, v)
// case *tmx.Polygon: handlePolygon(obj, v)
// case *tmx.Polyline: handlePolyline(obj, v)
// case *tmx.Image: handleImage(obj, v)
// }
Value interface{}
}
// String returns a string representation of this object, like:
// Object(Name="the name", X=%d, Y=%d, Width=%d, Height=%d)
func (o *Object) String() string {
return fmt.Sprintf("Object(Name=%q, X=%d, Y=%d, Width=%d, Height=%d)", o.Name, o.X, o.Y, o.Width, o.Height)
}