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Test Play
Just some code to make a sprite turn to target/face something, probably a cleaner way of doing this, in fact if there is please share, either way, hope this helps.
Strict
Import mojo
Global RedArrow:Image
Global BlueArrow:Image
Global targetx:Float
Global targety:Float
Global movetime:Int
Class MyApp Extends App
Method OnCreate:Int()
SetUpdateRate 60
RedArrow = LoadImage("red_arrow.png",,Image.MidHandle)
BlueArrow = LoadImage("blue_arrow.png",,Image.MidHandle)
targetx=Rnd(640)
targety=Rnd(480)
movetime=Millisecs()
For Local l:Int = 1 To 100
Local ta:cArrow = New cArrow()
Next
Return 0
End
Method OnUpdate:Int()
If Millisecs()-movetime > 1500
movetime=Millisecs()
targetx=Rnd(640)
targety=Rnd(480)
End If
If TouchHit()
Local ta:cArrow = New cArrow(BlueArrow)
End If
For Local ta:cArrow = Eachin ArrowList
ta.Update()
Next
Return 0
End
Method OnRender:Int()
Cls
For Local ta:cArrow = Eachin ArrowList
DrawImage(ta.sprite,ta.x,ta.y,ta.angle,1,1,0)
Next
Return 0
End
End
Global ArrowList:List<cArrow> = New List<cArrow>
Class cArrow
Field sprite:Image
Field x:Float
Field y:Float
Field velx:Float
Field vely:Float
Field speed:Float
Field angle:Float
Field turnrate:Float
Method New(_image:Image=RedArrow)
Self.sprite = _image
Self.x=Rnd(640)
Self.y=Rnd(480)
Self.angle=ATan2(targetx-Self.x,targety-Self.y)
Self.velx=Sin(Self.angle)
Self.vely=Sin(Self.angle)
Self.speed=Rnd(2,6)
Self.turnrate=Rnd(0,5)
ArrowList.AddLast(Self)
End Method
Method Update:Void()
If TouchDown()
Self.angle=TurnTo(Self.angle,ATan2(MouseX()-Self.x,MouseY()-Self.y),Self.turnrate)
Else
Self.angle=TurnTo(Self.angle,ATan2(targetx-Self.x,targety-Self.y),Self.turnrate )
End If
Self.velx=Sin(Self.angle)
Self.vely=Cos(Self.angle)
Self.x+=Self.velx*Self.speed
Self.y+=Self.vely*Self.speed
End Method
Method Render:Void()
DrawImage(Self.sprite,Self.x,Self.y,Self.angle)
End Method
End Class
Function Main:Int()
New MyApp
Return 0
End
Function Clerp:Float(_start : Float, _End : Float, _value : Float)
Local min:Float = 0;
Local max:Float = 360;
Local half:Float = Abs((max - min)/2.0)
Local retval:Float = 0.0;
Local diff:Float = 0.0;
If ((_End - _start) < -half) Then
diff = ((max - _start)+_End)*_value
retval = _start+diff
Else If((_End - _start) > half)
diff = -((max - _End)+_start)*_value
retval = _start+diff
Else
retval = _start+(_End-_start)*_value
Endif
Return retval
End
Function TurnTo:Float(_start : Float, _End : Float, _step : Float)
Local min:Float = -180;
Local max:Float = 180;
Local half:Float = 0
Local retval:Float = 0.0;
If (_End - _start) < -half And (_End - _start)>min And (_End - _start)<max Then
retval = (_start-_step)
Elseif (_End - _start) > half And (_End - _start)>min And (_End - _start)<max Then
retval = (_start+_step)
Elseif (_End - _start) < min Then
retval = (_start+_step)
Repeat
If retval<-180 Then retval+=360
If retval>180 Then retval -=360
Until retval>=-180 And retval<=180
Elseif (_End - _start) > max Then
retval = (_start-_step)
Repeat
If retval<-180 Then retval+=360
If retval>180 Then retval -=360
Until retval>=-180 And retval<=180
Else
retval = _start
Endif
Return retval
End
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