joejulian/gio
1
0
Fork 1
mirror of https://git.sr.ht/~eliasnaur/gio synced 2026-07-06 01:45:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

io/router: fix ellipse hit function

Browse Source 
The previous formula was simply wrong.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-05-11 12:15:54 +02:00
parent a046f15156
commit 3fd1ccbbed
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
io/router/pointer.go
+3 -3
View File
@@ -335,11 +335,11 @@ func (op *areaOp) Hit(pos f32.Point) bool {
case areaEllipse: case areaEllipse:
rx := float32(size.X) / 2 rx := float32(size.X) / 2
ry := float32(size.Y) / 2 ry := float32(size.Y) / 2
rx2 := rx * rx
ry2 := ry * ry
xh := pos.X - rx xh := pos.X - rx
yk := pos.Y - ry yk := pos.Y - ry
return xh*xh*ry2+yk*yk*rx2 <= rx2*ry2 // The ellipse function works in all cases because
// 0/0 is not <= 1.
return (xh*xh)/(rx*rx)+(yk*yk)/(ry*ry) <= 1
default: default:
panic("invalid area kind") panic("invalid area kind")
} }