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garfeng
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lafriks
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Support for object group rendering (#70)
Co-authored-by: Lauris BH <lauris@nix.lv>
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‎assets/test_render_objects.tmx

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<?xml version="1.0" encoding="UTF-8"?>
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<map version="1.9" tiledversion="1.9.2" orientation="orthogonal" renderorder="right-down" width="20" height="20" tilewidth="32" tileheight="32" infinite="0" nextlayerid="3" nextobjectid="11">
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<tileset firstgid="1" source="tilesets/test_wangset_tileset.tsx"/>
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<layer id="1" name="Layer 1" width="20" height="20">
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<data encoding="csv">
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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</data>
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</layer>
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<objectgroup id="2" name="Object Group 1">
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<object id="1" gid="1" x="0" y="32" width="32" height="32"/>
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<object id="2" gid="1" x="80" y="36" width="32" height="32" rotation="105"/>
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<object id="3" gid="21" x="49" y="28" width="32" height="32" rotation="105"/>
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<object id="4" gid="21" x="0" y="64" width="32" height="32"/>
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<object id="5" gid="3" x="64" y="96" width="32" height="32" rotation="-90"/>
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<object id="6" gid="1" x="2" y="169.311" width="50.4916" height="50.4916"/>
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<object id="7" gid="1" x="128.229" y="175.623" width="50.4916" height="50.4916" rotation="105"/>
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<object id="8" gid="21" x="79.3152" y="163" width="50.4916" height="50.4916" rotation="105"/>
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<object id="9" gid="21" x="2" y="219.803" width="50.4916" height="50.4916"/>
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<object id="10" gid="3" x="102.983" y="270.295" width="50.4916" height="50.4916" rotation="-90"/>
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</objectgroup>
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</map>

‎internal/utils/utils.go

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/*
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Copyright (c) 2017 Lauris Bukšis-Haberkorns <lauris@nix.lv>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
6+
in the Software without restriction, including without limitation the rights
7+
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8+
copies of the Software, and to permit persons to whom the Software is
9+
furnished to do so, subject to the following conditions:
10+
11+
The above copyright notice and this permission notice shall be included in all
12+
copies or substantial portions of the Software.
13+
14+
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15+
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16+
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17+
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18+
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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// Package utils contains some generic internal utilities
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package utils
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import (
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"sort"
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)
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// SortAnySlice sorts a slice with given less method
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func SortAnySlice[T any](data []T, lessMethod func(a, b T) bool) []T {
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s := &sortable[T]{
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data: data,
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lessMethod: lessMethod,
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}
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sort.Sort(s)
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return s.data
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}
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type sortable[T any] struct {
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data []T
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lessMethod func(a, b T) bool
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}
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// Swap implements from sort.Interface
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func (s *sortable[T]) Swap(i, j int) {
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tmp := (s.data)[i]
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(s.data)[i] = (s.data)[j]
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(s.data)[j] = tmp
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}
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// Less implements from sort.Interface
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func (s *sortable[T]) Less(i, j int) bool {
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return s.lessMethod(s.data[i], s.data[j])
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}
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// Len implements from sort.Interface
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func (s *sortable[T]) Len() int {
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return len(s.data)
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}

‎render/render_objects.go

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/*
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Copyright (c) 2017 Lauris Bukšis-Haberkorns <lauris@nix.lv>
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4+
Permission is hereby granted, free of charge, to any person obtaining a copy
5+
of this software and associated documentation files (the "Software"), to deal
6+
in the Software without restriction, including without limitation the rights
7+
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8+
copies of the Software, and to permit persons to whom the Software is
9+
furnished to do so, subject to the following conditions:
10+
11+
The above copyright notice and this permission notice shall be included in all
12+
copies or substantial portions of the Software.
13+
14+
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15+
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16+
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17+
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18+
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19+
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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package render
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import (
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"image"
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"image/color"
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"image/draw"
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"math"
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"github.com/lafriks/go-tiled"
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"github.com/lafriks/go-tiled/internal/utils"
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"github.com/disintegration/imaging"
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)
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// RenderVisibleGroups renders all visible groups
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func (r *Renderer) RenderVisibleGroups() error {
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for _, group := range r.m.Groups {
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if !group.Visible {
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continue
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}
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if err := r._renderGroup(group); err != nil {
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return err
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}
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}
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return nil
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}
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// RenderGroup renders single group.
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func (r *Renderer) RenderGroup(groupID int) error {
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if groupID >= len(r.m.Groups) {
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return ErrOutOfBounds
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}
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group := r.m.Groups[groupID]
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return r._renderGroup(group)
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}
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func (r *Renderer) _renderGroup(group *tiled.Group) error {
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for _, layer := range group.Layers {
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if !layer.Visible {
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continue
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}
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if err := r._renderLayer(layer); err != nil {
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return err
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}
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}
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for _, objectGroup := range group.ObjectGroups {
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if !objectGroup.Visible {
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continue
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}
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if err := r._renderObjectGroup(objectGroup); err != nil {
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return err
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}
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}
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return nil
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}
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// RenderVisibleLayersAndObjectGroups render all layers and object groups, layer first, objectGroup second
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// so the order may be incorrect,
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// you may put them into different groups, then call RenderVisibleGroups
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func (r *Renderer) RenderVisibleLayersAndObjectGroups() error {
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// TODO: The order maybe incorrect
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if err := r.RenderVisibleLayers(); err != nil {
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return err
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}
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return r.RenderVisibleObjectGroups()
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}
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// RenderVisibleObjectGroups renders all visible object groups
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func (r *Renderer) RenderVisibleObjectGroups() error {
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for i, layer := range r.m.ObjectGroups {
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if !layer.Visible {
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continue
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}
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if err := r.RenderObjectGroup(i); err != nil {
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return err
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}
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}
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return nil
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}
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// RenderObjectGroup renders a single object group
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func (r *Renderer) RenderObjectGroup(i int) error {
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if i >= len(r.m.ObjectGroups) {
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return ErrOutOfBounds
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}
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layer := r.m.ObjectGroups[i]
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return r._renderObjectGroup(layer)
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}
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func (r *Renderer) _renderObjectGroup(objectGroup *tiled.ObjectGroup) error {
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objs := objectGroup.Objects
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// sort objects from left top to right down
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objs = utils.SortAnySlice(objs, func(a, b *tiled.Object) bool {
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if a.Y != b.Y {
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return a.Y < b.Y
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}
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return a.X < b.X
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})
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for _, obj := range objs {
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if err := r.renderOneObject(objectGroup, obj); err != nil {
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return err
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}
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}
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return nil
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}
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// RenderGroupObjectGroup renders single object group in a certain group.
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func (r *Renderer) RenderGroupObjectGroup(groupID, objectGroupID int) error {
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if groupID >= len(r.m.Groups) {
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return ErrOutOfBounds
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}
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group := r.m.Groups[groupID]
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if objectGroupID >= len(group.ObjectGroups) {
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return ErrOutOfBounds
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}
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layer := group.ObjectGroups[objectGroupID]
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return r._renderObjectGroup(layer)
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}
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func (r *Renderer) renderOneObject(layer *tiled.ObjectGroup, o *tiled.Object) error {
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if !o.Visible {
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return nil
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}
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if o.GID == 0 {
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// TODO: o.GID == 0
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return nil
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}
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tile, err := r.m.TileGIDToTile(o.GID)
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if err != nil {
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return err
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}
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img, err := r.getTileImage(tile)
169+
if err != nil {
170+
return err
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}
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bounds := img.Bounds()
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srcSize := bounds.Size()
175+
dstSize := image.Pt(int(o.Width), int(o.Height))
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if !srcSize.Eq(dstSize) {
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img = imaging.Resize(img, dstSize.X, dstSize.Y, imaging.NearestNeighbor)
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}
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var originPoint image.Point
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img, originPoint = r._rotateObjectImage(img, o.Rotation)
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bounds = img.Bounds()
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pos := bounds.Add(image.Pt(int(o.X), int(o.Y)).Sub(originPoint))
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if layer.Opacity < 1 {
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mask := image.NewUniform(color.Alpha{uint8(layer.Opacity * 255)})
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draw.DrawMask(r.Result, pos, img, img.Bounds().Min, mask, mask.Bounds().Min, draw.Over)
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} else {
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draw.Draw(r.Result, pos, img, img.Bounds().Min, draw.Over)
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}
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return nil
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}
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func (r *Renderer) _rotateObjectImage(img image.Image, rotation float64) (newImage image.Image, originPoint image.Point) {
200+
bounds := img.Bounds()
201+
w := bounds.Dx()
202+
h := bounds.Dy()
203+
points := []image.Point{
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image.Pt(0, 0),
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image.Pt(w-1, 0),
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image.Pt(w-1, h-1),
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image.Pt(0, h-1),
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}
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sin, cos := math.Sincos(math.Pi * rotation / 180)
211+
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rotatedPointsX := []float64{}
213+
rotatedPointsY := []float64{}
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215+
for _, p := range points {
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x := float64(p.X)
217+
y := float64(p.Y)
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rotatedPointsX = append(rotatedPointsX, x*cos-y*sin)
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rotatedPointsY = append(rotatedPointsY, x*sin+y*cos)
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}
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223+
rotatedMinX := rotatedPointsX[0]
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rotatedMinY := rotatedPointsY[0]
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for i := 1; i < 4; i++ {
227+
rotatedMinX = math.Min(rotatedMinX, rotatedPointsX[i])
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rotatedMinY = math.Min(rotatedMinY, rotatedPointsY[i])
229+
}
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originPoint = image.Pt(int(rotatedPointsX[3]-rotatedMinX), int(rotatedPointsY[3]-rotatedMinY))
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return imaging.Rotate(img, -rotation, color.RGBA{}), originPoint
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}

‎render/render_objects_test.go

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/*
2+
Copyright (c) 2023 Lauris Bukšis-Haberkorns <lauris@nix.lv>
3+
Permission is hereby granted, free of charge, to any person obtaining a copy
4+
of this software and associated documentation files (the "Software"), to deal
5+
in the Software without restriction, including without limitation the rights
6+
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7+
copies of the Software, and to permit persons to whom the Software is
8+
furnished to do so, subject to the following conditions:
9+
The above copyright notice and this permission notice shall be included in all
10+
copies or substantial portions of the Software.
11+
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12+
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13+
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14+
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15+
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16+
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17+
SOFTWARE.
18+
*/
19+
20+
package render
21+
22+
import (
23+
"os"
24+
"testing"
25+
26+
"github.com/lafriks/go-tiled"
27+
)
28+
29+
func TestRenderer_RenderObjectGroup(t *testing.T) {
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tiledMap, err := tiled.LoadFile("../assets/test_render_objects.tmx")
31+
if err != nil {
32+
t.Error(err)
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return
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}
35+
36+
renderer, err := NewRenderer(tiledMap)
37+
if err != nil {
38+
t.Error(err)
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return
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}
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renderer.RenderObjectGroup(0)
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w, _ := os.Create("../assets/test_render_objects.png")
45+
defer w.Close()
46+
47+
if err = renderer.SaveAsPng(w); err != nil {
48+
t.Error(err)
49+
}
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}

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