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fix: allow arrow to draw full circle

This commit is contained in:
efim 2023-11-22 05:39:50 +00:00
parent 077537a1e3
commit f4c331983c
1 changed files with 18 additions and 12 deletions
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28
routes/room_page_templates_preview.go
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@ -94,6 +94,11 @@ func (r *roomTableData)ArrowData() arrowData {
radius := 50.0
startAngle := 90 + float64(startSector) * ( 360.0 / float64(total) )
endAngle := 90 + float64(endSector) * ( 360.0 / float64(total) )
// if need to draw full circle
if startSector == endSector {
startAngle += 3 // a bit forward
endAngle += 357 // ~ a bit backward (almost full circle forward)
}
startAngleRad := startAngle * (math.Pi / float64(180))
endAngleRad := endAngle * (math.Pi / float64(180))
// endAngle is radius angle, so perpendicular gives direction of teh arrow
@ -106,16 +111,17 @@ func (r *roomTableData)ArrowData() arrowData {
arrowAngleOffset := math.Pi / 4 // 45 degrees
arrowPointDirection := endAngleRad - math.Pi / 2
arrowheadLen := 10.0
line1Angle := arrowPointDirection - arrowAngleOffset
line2Angle := arrowPointDirection + arrowAngleOffset
line1EndX := x2 + arrowheadLen * math.Cos(line1Angle)
line1EndY := y2 + arrowheadLen * math.Sin(line1Angle)
line2EndX := x2 + arrowheadLen * math.Cos(line2Angle)
line2EndY := y2 + arrowheadLen * math.Sin(line2Angle)
arrowMinusAngle := arrowPointDirection - arrowAngleOffset
arrowPlusAngle := arrowPointDirection + arrowAngleOffset
arrowMinusEndX := x2 + arrowheadLen * math.Cos(arrowMinusAngle)
arrowMinusEndY := y2 + arrowheadLen * math.Sin(arrowMinusAngle)
arrowPlusEndX := x2 + arrowheadLen * math.Cos(arrowPlusAngle)
arrowPlusEndY := y2 + arrowheadLen * math.Sin(arrowPlusAngle)
// indicates that the shorter of the two possible arcs should be used.
largeArcFlag := 0
if math.Abs(float64(endSector) - float64(startSector)) > float64(total)/2.0 {
//
if endAngleRad - startAngleRad > (math.Pi) {
// specifies that the longer arc should be chosen.
largeArcFlag = 1
}
@ -129,10 +135,10 @@ func (r *roomTableData)ArrowData() arrowData {
EndX: int(x2),
EndY: int(y2),
LargeArcFlag: largeArcFlag,
Angle1X: int(line1EndX),
Angle1Y: int(line1EndY),
Angle2X: int(line2EndX),
Angle2Y: int(line2EndY),
Angle1X: int(arrowMinusEndX),
Angle1Y: int(arrowMinusEndY),
Angle2X: int(arrowPlusEndX),
Angle2Y: int(arrowPlusEndY),
}
}