forked from elliotmr/tmx
/
tiledrawer.go
74 lines (64 loc) · 1.63 KB
/
tiledrawer.go
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package pixeltmx
import (
"github.com/faiface/pixel"
"github.com/pkg/errors"
)
type tileLayerDrawer struct {
resources *Resources
info *LayerInfo
drawers map[uint32]*pixel.Drawer
}
func newTileLayerDrawer(resources *Resources, info *LayerInfo) (*tileLayerDrawer, error) {
ld := &tileLayerDrawer{
resources: resources,
info: info,
drawers: make(map[uint32]*pixel.Drawer),
}
for _, entry := range resources.entries {
_, exists := ld.drawers[entry.firstGID]
if !exists {
ld.drawers[entry.firstGID] = &pixel.Drawer{
Triangles: &pixel.TrianglesData{},
Picture: ld.resources.images[entry.source],
}
}
}
return ld, ld.Update()
}
func (ld *tileLayerDrawer) Type() int {
return TileLayerDrawer
}
func (ld *tileLayerDrawer) Info() *LayerInfo {
return ld.info
}
func (ld *tileLayerDrawer) Update() error {
// TODO: draworder
iter, err := ld.info.layer.Data.Iter()
if err != nil {
return errors.Wrap(err, "unable to load layer iterator")
}
for gid, drawer := range ld.drawers {
i := 1
for iter.Next() {
tse := ld.resources.entries[iter.Get().GID()]
if tse.firstGID != gid {
continue
}
if i*6 > drawer.Triangles.Len() {
drawer.Triangles.SetLen(i * 6)
}
cellIndex := int(iter.GetIndex())
loc, _ := ld.info.TileRect(cellIndex)
triangleSlice := drawer.Triangles.Slice((i-1)*6, i*6)
ld.resources.fillTileAndMod(iter.Get(), loc, ld.info.color, triangleSlice)
i++
}
drawer.Triangles.SetLen(i * 6)
}
return errors.Wrap(iter.Error(), "unable to iterate through layer")
}
func (ld *tileLayerDrawer) Draw(t pixel.Target) {
for _, d := range ld.drawers {
d.Draw(t)
}
}