migrated to github.com/zyedidia/generic/heap, pathfinding improved. g…

README.md

@@ -114,13 +114,13 @@ goos: linux
 goarch: amd64
 pkg: github.com/s0rg/grid
 cpu: AMD Ryzen 5 5500U with Radeon Graphics
-BenchmarkGrid/Set-12              1000000000        1.022 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/Get-12               721531257        1.634 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/Neighbours-12         66094719        18.29 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/LineBresenham-12       5609686        215.2 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/CastRay-12             4111668        283.9 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/CastShadow-12            34016        34912 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/LineOfSight-12           11792       100790 ns/op         0 B/op        0 allocs/op
-BenchmarkGrid/DijkstraMap-12            1054      1094518 ns/op     20656 B/op        3 allocs/op
-BenchmarkGrid/Path-12                    120     10212821 ns/op  14209590 B/op    40388 allocs/op
+BenchmarkGrid/Set-12                 1000000000      0.8379 ns/op       0 B/op         0 allocs/op
+BenchmarkGrid/Get-12                  781486358       1.521 ns/op       0 B/op         0 allocs/op
+BenchmarkGrid/Neighbours-12            61203862       19.25 ns/op       0 B/op         0 allocs/op
+BenchmarkGrid/LineBresenham-12          5331663       223.9 ns/op       0 B/op         0 allocs/op
+BenchmarkGrid/CastRay-12                4160371       287.7 ns/op       0 B/op         0 allocs/op
+BenchmarkGrid/CastShadow-12               33894     34771 ns/op         0 B/op         0 allocs/op
+BenchmarkGrid/LineOfSight-12              11482    104325 ns/op         0 B/op         0 allocs/op
+BenchmarkGrid/DijkstraMap-12               1011   1105615 ns/op     20656 B/op         3 allocs/op
+BenchmarkGrid/Path-12                       166   7458693 ns/op  13347421 B/op     13643 allocs/op
 ```

go.mod

@@ -1,11 +1,15 @@
 module github.com/s0rg/grid
 
-go 1.20
+go 1.21
 
 require (
 	github.com/s0rg/array2d v1.1.1
 	github.com/s0rg/set v1.0.1
 	github.com/s0rg/vec2d v1.1.1
+	github.com/zyedidia/generic v1.2.1
 )
 
-require golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b // indirect
+require (
+	github.com/segmentio/fasthash v1.0.3 // indirect
+	golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63 // indirect
+)

go.sum

@@ -4,5 +4,9 @@ github.com/s0rg/set v1.0.1 h1:eJ2KSRUwnIZOBtlQScgET80+jkm/ro01pn6YeZzgWp4=
 github.com/s0rg/set v1.0.1/go.mod h1:aBGSm+F2mCTDjNIRR4GMB04NMqZBhtSh0tOBe/u5z5k=
 github.com/s0rg/vec2d v1.1.1 h1:asdV+Iev4M5lcFwB46883k8oLku4JgNQHyI/4SHAtMo=
 github.com/s0rg/vec2d v1.1.1/go.mod h1:/0pgb+2ax3mWfBZ1gb9LMMFawvmGyWpgCjk8a/ImCgg=
-golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b h1:r+vk0EmXNmekl0S0BascoeeoHk/L7wmaW2QF90K+kYI=
-golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b/go.mod h1:FXUEEKJgO7OQYeo8N01OfiKP8RXMtf6e8aTskBGqWdc=
+github.com/segmentio/fasthash v1.0.3 h1:EI9+KE1EwvMLBWwjpRDc+fEM+prwxDYbslddQGtrmhM=
+github.com/segmentio/fasthash v1.0.3/go.mod h1:waKX8l2N8yckOgmSsXJi7x1ZfdKZ4x7KRMzBtS3oedY=
+github.com/zyedidia/generic v1.2.1 h1:Zv5KS/N2m0XZZiuLS82qheRG4X1o5gsWreGb0hR7XDc=
+github.com/zyedidia/generic v1.2.1/go.mod h1:ly2RBz4mnz1yeuVbQA/VFwGjK3mnHGRj1JuoG336Bis=
+golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63 h1:m64FZMko/V45gv0bNmrNYoDEq8U5YUhetc9cBWKS1TQ=
+golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63/go.mod h1:0v4NqG35kSWCMzLaMeX+IQrlSnVE/bqGSyC2cz/9Le8=

grid.go

@@ -1,13 +1,13 @@
 package grid
 
 import (
-	"container/heap"
 	"image"
 	"math"
 
 	"github.com/s0rg/array2d"
 	"github.com/s0rg/set"
 	"github.com/s0rg/vec2d"
+	"github.com/zyedidia/generic/heap"
 )
 
 const one = 1.0
@@ -131,16 +131,18 @@ func (m *Map[T]) Path(
 
 	var (
 		road   path
-		queue  pqueue
 		last   image.Point
 		closed = make(set.Set[image.Point])
 	)
 
-	heap.Init(&queue)
-	heap.Push(&queue, road.Fork(src, tdist))
+	queue := heap.New[path](func(a, b path) bool {
+		return a.Cost < b.Cost
+	})
+
+	queue.Push(road.Fork(src, tdist))
 
-	for queue.Len() > 0 {
-		road = heap.Pop(&queue).(path)
+	for queue.Size() > 0 {
+		road, _ = queue.Pop()
 		last = road.Last()
 
 		if !closed.TryAdd(last) {
@@ -155,7 +157,7 @@ func (m *Map[T]) Path(
 			var ncost float64
 
 			if ncost, ok = cost(p, dist(dst, p), t); ok {
-				heap.Push(&queue, road.Fork(p, ncost))
+				queue.Push(road.Fork(p, ncost))
 			}
 
 			return true