/
drawer.go
76 lines (67 loc) · 1.73 KB
/
drawer.go
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package ebitentmx
import (
"github.com/hajimehoshi/ebiten"
"github.com/pkg/errors"
"github.com/elliotmr/tmx"
)
// Drawer Types
const (
TileLayerDrawer = iota
ObjectGroupDrawer
ImageLayerDrawer
GroupDrawer
)
type Drawer interface {
Type() int
Info() *LayerInfo
Update() error
Draw(image *ebiten.Image) error
Image() *ebiten.Image
}
// NewDrawer creates a Drawer which will render the layer and recursively draw all child layers.
func NewDrawer(resources *Resources, parent Drawer, layer *tmx.Layer) (Drawer, error) {
info, err := newLayerInfo(parent.Info(), layer)
if err != nil {
panic(err)
}
switch info.layer.XMLName.Local {
case "layer":
return newTileLayerDrawer(resources, info)
case "objectgroup":
return newObjectGroupDrawer(resources, info)
case "imagelayer":
return newImageLayerDriver(resources, info)
case "group":
return newGroupDrawer(resources, info)
}
return nil, errors.Errorf("invalid layer type: %s", info.layer.XMLName.Local)
}
// NewRootDrawer will create a special Drawer that will recursively draw the entire tmx map.
func NewRootDrawer(resources *Resources, mapData *tmx.Map) (Drawer, error) {
info := &LayerInfo{
mapData: mapData,
layer: nil,
w: int(mapData.Width),
h: int(mapData.Height),
offX: 0.0,
offY: 0.0,
color: ebiten.ColorM{},
}
gd := &groupDrawer{
info: info,
children: make([]Drawer, 0),
}
gd.image, _ = ebiten.NewImage(
int(mapData.Width * mapData.TileWidth),
int(mapData.Height * mapData.TileHeight),
ebiten.FilterNearest,
)
for _, l := range mapData.Layers {
d, err := NewDrawer(resources, gd, l)
if err != nil {
return nil, errors.Wrap(err, "unable to create layer")
}
gd.children = append(gd.children, d)
}
return gd, nil
}