Oddball's polygon collision code conversion.

[JesseParticipant]

I thought these might be useful to somebody. here is the Blitzmax polygon code by Oddball from here:
http://www.mojolabs.nz/codearcs.php?code=1676
converted to monkey2:

Monkey

[crayon-5cba154114781627551030 inline="true" ] Namespace myapp #Import "<std>" #Import "<mojo>" Using std.. Using mojo.. Class MyWindow Extends Window Field verts:Float[]=New Float[](-25.0,0.0,-75.0,75.0,0.0,50.0,100.0,100.0,50.0,25.0,100.0, 0.0,50.0,-25.0,100.0,-100.0,0.0,-50.0,-75.0,-75.0) Field cursor:Float[]=New Float[](0.0,-50.0,100.0,-100.0,50.0,0.0,100.0,100.0,0.0,50.0,-100.0,100.0, -50.0,0.0,-100.0,-100.0) Field ang:Float =0 Field coltype:Int =0 Field rad:Float =20 Method New( title:String="Simple mojo app",width:Int=800,height:Int=600,flags:WindowFlags=Null ) Super.New( title,width,height,flags ) End Method OnRender( canvas:Canvas ) Override App.RequestRender() If Keyboard.KeyHit(Key.Key1) Then coltype=0 If Keyboard.KeyHit(Key.Key2) Then coltype=1 If Keyboard.KeyHit(Key.Key3) Then coltype=3 If Keyboard.KeyHit(Key.Key4) Then coltype=2 Local x:Float=400 Local y:Float=300 Local rot:Float=(ang) Local sx:Float=Cos((ang))/2+1.5 Local sy:Float=Sin((ang))/2+1.5 Local ox:Float=Cos((ang/2))*50 Local oy:Float=Sin((ang/2))*50 Local lx:Float=400+Cos((-ang))*300 Local ly:Float=300+Sin((-ang))*300 Local mx:Int=Mouse.X Local my:Int=Mouse.Y Select coltype Case 0 If PointInTFormPoly(mx,my,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,0) Else canvas.Color = New Color(0,.5,.5) EndIf Case 1 If CircleToTFormPoly(mx,my,rad,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf Case 2 If TFormPolyToTFormPoly(verts,x,y,rot,sx,sy,cursor,mx,my,-rot,0.5,0.5) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf Case 3 If LineToTFormPoly(mx,my,lx,ly,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf End Select DrawPoly(canvas,verts,True,x,y,rot,sx,sy) 'canvas.PushMatrix() canvas.Color= New Color(1,1,1) canvas.DrawText("Select 1, 2, 3 or 4",5,0) canvas.DrawText("1: PointToTFormPoly",5,20) canvas.DrawText("2: CircleToTFormPoly",5,35) canvas.DrawText("3: LineToTFormPoly",5,50) canvas.DrawText("4: TFormPolyToTFormPoly",5,65) canvas.Color = New Color(1,0,0) Select coltype Case 0 canvas.DrawLine(mx,my-10,mx,my+10) canvas.DrawLine(mx-10,my,mx+10,my) Case 1 canvas.DrawOval(mx-rad,my-rad,rad*2,rad*2) Case 2 DrawPoly(canvas,cursor,True,mx,my,-rot,0.5,0.5) Case 3 canvas.DrawLine(mx,my,lx,ly) End Select 'canvas.PopMatrix() ang+=Pi/180.0 'ang = Pi/180.0 * 90 End End Function Main() New AppInstance New MyWindow App.Run() End Function TFormPolyToTFormPoly:Bool( p1_xy:Float[], p1_x:Float=0, p1_y:Float=0, p1_rot:Float=0, p1_scale_x:Float=1, p1_scale_y:Float=1, p2_xy:Float[], p2_x:Float=0, p2_y:Float=0, p2_rot:Float=0, p2_scale_x:Float=1, p2_scale_y:Float=1) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False Local tform1_xy:Float[]=TFormPoly(p1_xy,p1_x,p1_y,p1_rot,p1_scale_x,p1_scale_y) Local tform2_xy:Float[]=TFormPoly(p2_xy,p2_x,p2_y,p2_rot,p2_scale_x,p2_scale_y) If PolyToPoly(tform1_xy,tform2_xy) Return True Else Return False EndIf End Function Function PolyToTFormPoly:Bool( p1_xy:Float[], p2_xy:Float[], p2_x:Float=0, p2_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False Local tform_xy:Float[]=TFormPoly(p2_xy,p2_x,p2_y,rot,scale_x,scale_y) If PolyToPoly(p1_xy,tform_xy) Return True Else Return False EndIf End Function Function PolyToPoly:Bool( p1_xy:Float[], p2_xy:Float[] ) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False For Local i:Int=0 Until p1_xy.Length Step 2 If PointInPoly(p1_xy[i],p1_xy[i+1],p2_xy) Then Return True Next For Local i:Int=0 Until p2_xy.Length Step 2 If PointInPoly(p2_xy[i],p2_xy[i+1],p1_xy) Then Return True Next Local l1_x1:Float=p1_xy[p1_xy.Length-2] Local l1_y1:Float=p1_xy[p1_xy.Length-1] For Local i1:Int=0 Until p1_xy.Length Step 2 Local l1_x2:Int =p1_xy[i1] Local l1_y2:Int=p1_xy[i1+1] Local l2_x1:Float=p2_xy[p2_xy.Length-2] Local l2_y1:Float=p2_xy[p2_xy.Length-1] For Local i2:Int=0 Until p2_xy.Length Step 2 Local l2_x2:Int=p2_xy[i2] Local l2_y2:Int=p2_xy[i2+1] If LinesCross(l1_x1,l1_y1,l1_x2,l1_y2,l2_x1,l2_y1,l2_x2,l2_y2) Return True EndIf l2_x1=l2_x2 l2_y1=l2_y2 Next l1_x1=l1_x2 l1_y1=l1_y2 Next Return False End Function Function CircleToTFormPoly:Bool( circle_x:Float, circle_y:Float, radius:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False Local tform_xy:Float[]=TFormPoly(xy,poly_x,poly_y,rot,scale_x,scale_y) Return CircleToPoly(circle_x,circle_y,radius,tform_xy) End Function Function CircleToPoly:Bool( circle_x:Float, circle_y:Float, radius:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False If PointInPoly(circle_x,circle_y,xy) Then Return True Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] If LineToCircle(x1,y1,x2,y2,circle_x,circle_y,radius) Then Return True x1=x2 y1=y2 Next Return False End Function Function LineToTFormPoly:Bool( line_x1:Float, line_y1:Float, line_x2:Float, line_y2:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False TFormGlobalToLocal(Varptr line_x1,Varptr line_y1,poly_x,poly_y,rot,scale_x, scale_y) TFormGlobalToLocal(Varptr line_x2,Varptr line_y2,poly_x,poly_y,rot,scale_x, scale_y) Return LineToPoly(line_x1,line_y1,line_x2,line_y2,xy) End Function Function LineToPoly:Bool( line_x1:Float, line_y1:Float, line_x2:Float, line_y2:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False If PointInPoly(line_x1,line_y1,xy) Then Return True Local poly_x1:Float=xy[xy.Length-2] Local poly_y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local poly_x2:Float=xy[i] Local poly_y2:Float=xy[i+1] If LinesCross(line_x1,line_y1,line_x2,line_y2, poly_x1,poly_y1,poly_x2,poly_y2) Then Return True poly_x1=poly_x2 poly_y1=poly_y2 Next Return False End Function Function PointInTFormPoly:Bool( point_x:Float, point_y:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False TFormGlobalToLocal(Varptr point_x, Varptr point_y,poly_x,poly_y,rot,scale_x, scale_y) Return PointInPoly(point_x,point_y,xy) End Function Function PointInPoly:Bool( point_x:Float, point_y:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] Local cur_quad:Int=GetQuad(point_x,point_y,x1,y1) Local next_quad:Int Local total:Int For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] next_quad=GetQuad(point_x,point_y,x2,y2) Local diff:Int=next_quad-cur_quad Select diff Case 2,-2 If ( x2 - ( ((y2 - point_y) * (x1 - x2)) / (y1 - y2) ) )<point_x diff=-diff EndIf Case 3 diff=-1 Case -3 diff=1 End Select total+=diff cur_quad=next_quad x1=x2 y1=y2 Next If Abs(total)=4 Then Return True Else Return False End Function Function TFormPoly:Float[]( xy:Float[], tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return Null Local tform_xy:Float[]=xy.Slice(0,xy.Length) For Local i:Int=0 Until tform_xy.Length Step 2 TFormLocalToGlobal(Varptr tform_xy[i],Varptr tform_xy[i+1],tform_x,tform_y,rot, scale_x,scale_y) Next Return tform_xy End Function Function TFormGlobalToLocal( point_x:Float Ptr, point_y:Float Ptr, '8888888888888888888888 tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) point_x[0]-=tform_x point_y[0]-=tform_y 'Print point_x[0]+" "+point_y[0] Local mag:Float=Sqrt(point_x[0]*point_x[0]+point_y[0]*point_y[0]) Local ang:Float=ATan2(point_y[0],point_x[0]) point_x[0]=Cos((ang-rot))*mag point_y[0]=Sin((ang-rot))*mag point_x[0]/=scale_x point_y[0]/=scale_y 'Print point_x[0]+" "+point_y[0] End Function Function TFormLocalToGlobal( point_x:Float Ptr, point_y:Float Ptr, tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) point_x[0]*=scale_x point_y[0]*=scale_y Local mag:Float=Sqrt(point_x[0]*point_x[0]+point_y[0]*point_y[0]) Local ang:Float=ATan2(point_y[0],point_x[0]) point_x[0]=Cos((ang+rot))*mag point_y[0]=Sin((ang+rot))*mag point_x[0]+=tform_x point_y[0]+=tform_y End Function 'Adapted from Fredborg's code Function LinesCross:Bool( x0:Float, y0:Float , x1:Float, y1:Float, x2:Float ,y2:Float, x3:Float, y3:Float ) Local n:Float=(y0-y2)*(x3-x2)-(x0-x2)*(y3-y2) Local d:Float=(x1-x0)*(y3-y2)-(y1-y0)*(x3-x2) If Abs(d) < 0.0001 ' Lines are parallel! Return False Else ' Lines might cross! Local Sn:Float=(y0-y2)*(x1-x0)-(x0-x2)*(y1-y0) Local AB:Float=n/d If AB>0.0 And AB<1.0 Local CD:Float=Sn/d If CD>0.0 And CD<1.0 ' Intersection Point Local X:Int=x0+AB*(x1-x0) Local Y:Int=y0+AB*(y1-y0) Return True End If End If ' Lines didn't cross, because the intersection was beyond the end points of the lines EndIf ' Lines do Not cross! Return False End Function 'Adapted from TomToad's code Function LineToCircle:Bool( x1:Float, y1:Float, x2:Float, y2:Float, px:Float, py:Float, r:Float ) Local sx:Float = x2-x1 Local sy:Float = y2-y1 Local q:Float = ((px-x1) * (x2-x1) + (py - y1) * (y2-y1)) / (sx*sx + sy*sy) If q < 0.0 Then q = 0.0 If q > 1.0 Then q = 1.0 Local cx:Float=(1-q)*x1+q*x2 Local cy:Float=(1-q)*y1 + q*y2 If PointToPointDist(px,py,cx,cy) < r Return True Else Return False Endif End Function Function PointToPointDist:Float( x1:Float, y1:Float, x2:Float, y2:Float ) Local dx:Float = x1-x2 Local dy:Float = y1-y2 Return Sqrt(dx*dx + dy*dy) End Function Function GetQuad:Int(axis_x:Float,axis_y:Float,vert_x:Float,vert_y:Float) If vert_x<axis_x If vert_y<axis_y Return 1 Else Return 4 EndIf Else If vert_y<axis_y Return 2 Else Return 3 EndIf EndIf End Function Function DrawPoly(canvas:Canvas,xy:Float[], fill:Int=True, x:Float=0, y:Float=0, rot:Float=0,sx:Float=1,sy:Float=1 ) canvas.PushMatrix() canvas.Translate(x,y) canvas.Rotate(-rot) canvas.Scale(sx,sy) If fill canvas.DrawPoly(xy) Else Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] canvas.DrawLine(x1,y1,x2,y2) ',x-0.5,y-0.5) x1=x2 y1=y2 Next EndIf canvas.PopMatrix() End Function

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[crayon-5cba154114781627551030 inline="true" ] Namespace myapp   #Import "<std>" #Import "<mojo>"   Using std.. Using mojo..   Class MyWindow Extends Window   Field verts:Float[]=New Float[](-25.0,0.0,-75.0,75.0,0.0,50.0,100.0,100.0,50.0,25.0,100.0, 0.0,50.0,-25.0,100.0,-100.0,0.0,-50.0,-75.0,-75.0) Field cursor:Float[]=New Float[](0.0,-50.0,100.0,-100.0,50.0,0.0,100.0,100.0,0.0,50.0,-100.0,100.0, -50.0,0.0,-100.0,-100.0) Field ang:Float =0   Field coltype:Int =0   Field rad:Float =20 Method New( title:String="Simple mojo app",width:Int=800,height:Int=600,flags:WindowFlags=Null ) Super.New( title,width,height,flags ) End   Method OnRender( canvas:Canvas ) Override App.RequestRender() If Keyboard.KeyHit(Key.Key1) Then coltype=0 If Keyboard.KeyHit(Key.Key2) Then coltype=1 If Keyboard.KeyHit(Key.Key3) Then coltype=3 If Keyboard.KeyHit(Key.Key4) Then coltype=2 Local x:Float=400 Local y:Float=300 Local rot:Float=(ang) Local sx:Float=Cos((ang))/2+1.5 Local sy:Float=Sin((ang))/2+1.5 Local ox:Float=Cos((ang/2))*50 Local oy:Float=Sin((ang/2))*50 Local lx:Float=400+Cos((-ang))*300 Local ly:Float=300+Sin((-ang))*300 Local mx:Int=Mouse.X Local my:Int=Mouse.Y Select coltype Case 0   If PointInTFormPoly(mx,my,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,0) Else canvas.Color = New Color(0,.5,.5) EndIf Case 1 If CircleToTFormPoly(mx,my,rad,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf Case 2 If TFormPolyToTFormPoly(verts,x,y,rot,sx,sy,cursor,mx,my,-rot,0.5,0.5) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf Case 3 If LineToTFormPoly(mx,my,lx,ly,verts,x,y,rot,sx,sy) canvas.Color = New Color(0,1,1) Else canvas.Color = New Color(0,.5,.5) EndIf End Select DrawPoly(canvas,verts,True,x,y,rot,sx,sy) 'canvas.PushMatrix() canvas.Color= New Color(1,1,1) canvas.DrawText("Select 1, 2, 3 or 4",5,0) canvas.DrawText("1: PointToTFormPoly",5,20) canvas.DrawText("2: CircleToTFormPoly",5,35) canvas.DrawText("3: LineToTFormPoly",5,50) canvas.DrawText("4: TFormPolyToTFormPoly",5,65) canvas.Color = New Color(1,0,0) Select coltype Case 0 canvas.DrawLine(mx,my-10,mx,my+10) canvas.DrawLine(mx-10,my,mx+10,my) Case 1 canvas.DrawOval(mx-rad,my-rad,rad*2,rad*2) Case 2 DrawPoly(canvas,cursor,True,mx,my,-rot,0.5,0.5) Case 3 canvas.DrawLine(mx,my,lx,ly) End Select 'canvas.PopMatrix() ang+=Pi/180.0 'ang = Pi/180.0 * 90 End End   Function Main()   New AppInstance New MyWindow App.Run() End   Function TFormPolyToTFormPoly:Bool( p1_xy:Float[], p1_x:Float=0, p1_y:Float=0, p1_rot:Float=0, p1_scale_x:Float=1, p1_scale_y:Float=1, p2_xy:Float[], p2_x:Float=0, p2_y:Float=0, p2_rot:Float=0, p2_scale_x:Float=1, p2_scale_y:Float=1) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False Local tform1_xy:Float[]=TFormPoly(p1_xy,p1_x,p1_y,p1_rot,p1_scale_x,p1_scale_y) Local tform2_xy:Float[]=TFormPoly(p2_xy,p2_x,p2_y,p2_rot,p2_scale_x,p2_scale_y) If PolyToPoly(tform1_xy,tform2_xy) Return True Else Return False EndIf End Function   Function PolyToTFormPoly:Bool( p1_xy:Float[], p2_xy:Float[], p2_x:Float=0, p2_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False Local tform_xy:Float[]=TFormPoly(p2_xy,p2_x,p2_y,rot,scale_x,scale_y) If PolyToPoly(p1_xy,tform_xy) Return True Else Return False EndIf End Function   Function PolyToPoly:Bool( p1_xy:Float[], p2_xy:Float[] ) If p1_xy.Length<6 Or (p1_xy.Length&1) Return False If p2_xy.Length<6 Or (p2_xy.Length&1) Return False For Local i:Int=0 Until p1_xy.Length Step 2 If PointInPoly(p1_xy[i],p1_xy[i+1],p2_xy) Then Return True Next For Local i:Int=0 Until p2_xy.Length Step 2 If PointInPoly(p2_xy[i],p2_xy[i+1],p1_xy) Then Return True Next Local l1_x1:Float=p1_xy[p1_xy.Length-2] Local l1_y1:Float=p1_xy[p1_xy.Length-1] For Local i1:Int=0 Until p1_xy.Length Step 2 Local l1_x2:Int =p1_xy[i1] Local l1_y2:Int=p1_xy[i1+1] Local l2_x1:Float=p2_xy[p2_xy.Length-2] Local l2_y1:Float=p2_xy[p2_xy.Length-1] For Local i2:Int=0 Until p2_xy.Length Step 2 Local l2_x2:Int=p2_xy[i2] Local l2_y2:Int=p2_xy[i2+1] If LinesCross(l1_x1,l1_y1,l1_x2,l1_y2,l2_x1,l2_y1,l2_x2,l2_y2) Return True EndIf l2_x1=l2_x2 l2_y1=l2_y2 Next l1_x1=l1_x2 l1_y1=l1_y2 Next Return False End Function   Function CircleToTFormPoly:Bool( circle_x:Float, circle_y:Float, radius:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False Local tform_xy:Float[]=TFormPoly(xy,poly_x,poly_y,rot,scale_x,scale_y) Return CircleToPoly(circle_x,circle_y,radius,tform_xy) End Function   Function CircleToPoly:Bool( circle_x:Float, circle_y:Float, radius:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False If PointInPoly(circle_x,circle_y,xy) Then Return True Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] If LineToCircle(x1,y1,x2,y2,circle_x,circle_y,radius) Then Return True x1=x2 y1=y2 Next Return False End Function   Function LineToTFormPoly:Bool( line_x1:Float, line_y1:Float, line_x2:Float, line_y2:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False TFormGlobalToLocal(Varptr line_x1,Varptr line_y1,poly_x,poly_y,rot,scale_x, scale_y) TFormGlobalToLocal(Varptr line_x2,Varptr line_y2,poly_x,poly_y,rot,scale_x, scale_y) Return LineToPoly(line_x1,line_y1,line_x2,line_y2,xy) End Function   Function LineToPoly:Bool( line_x1:Float, line_y1:Float, line_x2:Float, line_y2:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False If PointInPoly(line_x1,line_y1,xy) Then Return True Local poly_x1:Float=xy[xy.Length-2] Local poly_y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local poly_x2:Float=xy[i] Local poly_y2:Float=xy[i+1] If LinesCross(line_x1,line_y1,line_x2,line_y2, poly_x1,poly_y1,poly_x2,poly_y2) Then Return True poly_x1=poly_x2 poly_y1=poly_y2 Next Return False End Function   Function PointInTFormPoly:Bool( point_x:Float, point_y:Float, xy:Float[], poly_x:Float=0, poly_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return False TFormGlobalToLocal(Varptr point_x, Varptr point_y,poly_x,poly_y,rot,scale_x, scale_y) Return PointInPoly(point_x,point_y,xy) End Function   Function PointInPoly:Bool( point_x:Float, point_y:Float, xy:Float[] ) If xy.Length<6 Or (xy.Length&1) Return False Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] Local cur_quad:Int=GetQuad(point_x,point_y,x1,y1) Local next_quad:Int Local total:Int For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] next_quad=GetQuad(point_x,point_y,x2,y2) Local diff:Int=next_quad-cur_quad Select diff Case 2,-2 If ( x2 - ( ((y2 - point_y) * (x1 - x2)) / (y1 - y2) ) )<point_x diff=-diff EndIf Case 3 diff=-1 Case -3 diff=1 End Select total+=diff cur_quad=next_quad x1=x2 y1=y2 Next If Abs(total)=4 Then Return True Else Return False End Function   Function TFormPoly:Float[]( xy:Float[], tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) If xy.Length<6 Or (xy.Length&1) Return Null Local tform_xy:Float[]=xy.Slice(0,xy.Length) For Local i:Int=0 Until tform_xy.Length Step 2 TFormLocalToGlobal(Varptr tform_xy[i],Varptr tform_xy[i+1],tform_x,tform_y,rot, scale_x,scale_y) Next Return tform_xy End Function   Function TFormGlobalToLocal( point_x:Float Ptr, point_y:Float Ptr, '8888888888888888888888 tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) point_x[0]-=tform_x point_y[0]-=tform_y 'Print point_x[0]+"  "+point_y[0] Local mag:Float=Sqrt(point_x[0]*point_x[0]+point_y[0]*point_y[0]) Local ang:Float=ATan2(point_y[0],point_x[0]) point_x[0]=Cos((ang-rot))*mag point_y[0]=Sin((ang-rot))*mag point_x[0]/=scale_x point_y[0]/=scale_y 'Print point_x[0]+"  "+point_y[0] End Function   Function TFormLocalToGlobal( point_x:Float Ptr, point_y:Float Ptr, tform_x:Float=0, tform_y:Float=0, rot:Float=0, scale_x:Float=1, scale_y:Float=1) point_x[0]*=scale_x point_y[0]*=scale_y Local mag:Float=Sqrt(point_x[0]*point_x[0]+point_y[0]*point_y[0]) Local ang:Float=ATan2(point_y[0],point_x[0]) point_x[0]=Cos((ang+rot))*mag point_y[0]=Sin((ang+rot))*mag point_x[0]+=tform_x point_y[0]+=tform_y End Function   'Adapted from Fredborg's code Function LinesCross:Bool( x0:Float, y0:Float , x1:Float, y1:Float, x2:Float ,y2:Float, x3:Float, y3:Float )    Local n:Float=(y0-y2)*(x3-x2)-(x0-x2)*(y3-y2) Local d:Float=(x1-x0)*(y3-y2)-(y1-y0)*(x3-x2) If Abs(d) < 0.0001 ' Lines are parallel! Return False Else ' Lines might cross! Local Sn:Float=(y0-y2)*(x1-x0)-(x0-x2)*(y1-y0)   Local AB:Float=n/d If AB>0.0 And AB<1.0 Local CD:Float=Sn/d If CD>0.0 And CD<1.0 ' Intersection Point Local X:Int=x0+AB*(x1-x0)        Local Y:Int=y0+AB*(y1-y0) Return True End If End If ' Lines didn't cross, because the intersection was beyond the end points of the lines EndIf   ' Lines do Not cross! Return False   End Function   'Adapted from TomToad's code Function LineToCircle:Bool( x1:Float, y1:Float, x2:Float, y2:Float, px:Float, py:Float, r:Float ) Local sx:Float = x2-x1 Local sy:Float = y2-y1 Local q:Float = ((px-x1) * (x2-x1) + (py - y1) * (y2-y1)) / (sx*sx + sy*sy) If q < 0.0 Then q = 0.0 If q > 1.0 Then q = 1.0 Local cx:Float=(1-q)*x1+q*x2 Local cy:Float=(1-q)*y1 + q*y2 If PointToPointDist(px,py,cx,cy) < r Return True Else Return False Endif End Function   Function PointToPointDist:Float( x1:Float, y1:Float, x2:Float, y2:Float )   Local dx:Float = x1-x2 Local dy:Float = y1-y2 Return Sqrt(dx*dx + dy*dy) End Function   Function GetQuad:Int(axis_x:Float,axis_y:Float,vert_x:Float,vert_y:Float) If vert_x<axis_x If vert_y<axis_y Return 1 Else Return 4 EndIf Else If vert_y<axis_y Return 2 Else Return 3 EndIf EndIf   End Function   Function DrawPoly(canvas:Canvas,xy:Float[], fill:Int=True, x:Float=0, y:Float=0,   rot:Float=0,sx:Float=1,sy:Float=1 ) canvas.PushMatrix() canvas.Translate(x,y) canvas.Rotate(-rot) canvas.Scale(sx,sy)   If fill canvas.DrawPoly(xy) Else Local x1:Float=xy[xy.Length-2] Local y1:Float=xy[xy.Length-1] For Local i:Int=0 Until xy.Length Step 2 Local x2:Float=xy[i] Local y2:Float=xy[i+1] canvas.DrawLine(x1,y1,x2,y2) ',x-0.5,y-0.5) x1=x2 y1=y2 Next EndIf canvas.PopMatrix() End Function

[/crayon]

[coconParticipant]

Cool!

Also I have been looking for the Blitz archives this week, since wasted.nz is down this site will come handy.

[DruggedBunnyParticipant]

@cocon That is the new home of skidracer’s Blitz/Monkey1 web archive, it just moved from wasted.nz.

Thanks, Jesse!

[AmonParticipant]

Thank you, Jesse. This is cool.

[Author]

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