Custom Markers: Half filled circles

Function CirclesMarkerProc(s)
	STRUCT WMMarkerHookStruct &s
	if( s.marker > 3 )
			return 0
	endif
 
	Variable size= s.size-s.penThick/2
 
	if( s.opaque )
		SetDrawEnv linethick=0,fillpat=-1
		DrawRect s.x-size,s.y-size,s.x+size,s.y+size
		SetDrawEnv linethick=s.penThick
	endif
 
	switch(s.marker)
	case 0: 			// Up
		SetDrawEnv linethick=s.penThick, fillpat=1,fillfgc= (s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue), linefgc=(s.penRGB.red,s.penRGB.green,s.penRGB.blue)
		DrawOval s.x-size,s.y-size,s.x+size,s.y+size
		SetDrawEnv fillfgc= (65535,65535,65535),linefgc=(s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue)
		DrawArc s.x,s.y,size-s.penThick,0,180
		Break
	case 1: 		//Right
		SetDrawEnv linethick=s.penThick, fillpat=1,fillfgc= (s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue), linefgc=(s.penRGB.red,s.penRGB.green,s.penRGB.blue)
		DrawOval s.x-size,s.y-size,s.x+size,s.y+size
		SetDrawEnv fillfgc= (65535,65535,65535),linefgc=(s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue)
		DrawArc s.x,s.y,size-s.penThick,-90,90
		Break
	case 2: 			// Bottom
		SetDrawEnv linethick=s.penThick, fillpat=1,fillfgc= (s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue), linefgc=(s.penRGB.red,s.penRGB.green,s.penRGB.blue)
		DrawOval s.x-size,s.y-size,s.x+size,s.y+size
		SetDrawEnv fillfgc= (65535,65535,65535),linefgc=(s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue)
		DrawArc s.x,s.y,size-s.penThick,180,0
		Break
	case 3: 		//left
		SetDrawEnv linethick=s.penThick, fillpat=1,fillfgc= (s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue), linefgc=(s.penRGB.red,s.penRGB.green,s.penRGB.blue)
		DrawOval s.x-size,s.y-size,s.x+size,s.y+size
		SetDrawEnv fillfgc= (65535,65535,65535),linefgc=(s.mrkRGB.red,s.mrkRGB.green,s.mrkRGB.blue)
		DrawArc s.x,s.y,size-s.penThick,90,-90
		Break
	endswitch
	return 1
End

Window Graph1() : Graph
	PauseUpdate; Silent 1		// building window...
	Make/O/N=10 testw=sin(x)
	Display /W=(35,44,430,252) testw,testw,testw,testw
	ModifyGraph offset(testw#1)={0,-0.2},offset(testw#2)={0,-0.4},offset(testw#3)={0,-0.6}
	ModifyGraph mode=3,marker(testw)=100,marker(testw#1)=101,marker(testw#2)=102,marker(testw#3)=103
	SetWindow kwTopWin,markerHook={CirclesMarkerProc,100,103}
EndMacro