35 lines
780 B
Go
35 lines
780 B
Go
|
package collision
|
||
|
|
|
||
|
|
import (
|
||
|
|
"git.kirsle.net/apps/doodle/lib/render"
|
||
|
|
"git.kirsle.net/apps/doodle/pkg/log"
|
||
|
|
)
|
||
|
|
|
||
|
|
// IndexTuple holds two integers used as array indexes.
|
||
|
|
type IndexTuple [2]int
|
||
|
|
|
||
|
|
// BetweenBoxes checks if there is a collision between any
|
||
|
|
// two bounding rectangles.
|
||
|
|
//
|
||
|
|
// This returns a generator that spits out indexes of the
|
||
|
|
// intersecting boxes.
|
||
|
|
func BetweenBoxes(boxes []render.Rect) chan IndexTuple {
|
||
|
|
generator := make(chan IndexTuple)
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
// Outer loop: test each box for intersection with the others.
|
||
|
|
for i, box := range boxes {
|
||
|
|
for j := i + 1; j < len(boxes); j++ {
|
||
|
|
if box.Intersects(boxes[j]) {
|
||
|
|
log.Info("Actor %d intersects %d", i, j)
|
||
|
|
generator <- IndexTuple{i, j}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
close(generator)
|
||
|
|
}()
|
||
|
|
|
||
|
|
return generator
|
||
|
|
}
|