### Afghan Urbanization Pie Chart ###

class GRDEVICE_MEM_RGB24 imagedev;		## color rendering device in memory for drawing GraphTip
class GRDEVICE_MEM_BINARY maskdev;		## transparency mask in memory for GraphTip
class GC gc;									## graphics context for GraphTip

class GRE_LAYER_VECTOR cntyLayer;
class GRE_GROUP group;
class VECTOR CntyVec;
class GEOREF vecGeoref;
class TRANSPARM trans;
class POINT2D ptLayer;
class POINT2D offset;
class COLOR color;

numeric polyNum;						## element number of polygon under cursor
numeric total;							## variable for total number of households in county
numeric urban, rural	;		## variables for different household type values
string percent$;				## string for percemtage labels
numeric start;				## starting x-ccordinate for label, computed from rendered length

## procedure called when group or layout is initialized
proc OnInitialize () {
	imagedev.Create(100, 85);	## create GraphTip drawing area and mask with specified dimensions
	maskdev.Create(100, 85);
	gc = maskdev.CreateGC();	## create graphics context for mask
	gc.SetColorPixel(1);
	gc.FillArcWedge(42, 30, 25, 25, 0, 360);		## set mask values for pie circle and label rectangle
	gc.FillRect(1, 60, 85, 40);						## areas to 1; other graph tip areas transparent 
	offset.x = 10;					## set offset of graphtip from cursor position (right and down)
	offset.y = 10;
	}

### procedure called when View is created for group; use to get layer information
proc OnLayoutDrawEnd (
   class GRE_LAYOUT layout,
   class GRE_VIEW view
   ) {
	group = layout.GetGroupByName("Urbanization");
	cntyLayer = group.ActiveLayer;
	DispGetVectorFromLayer(CntyVec, cntyLayer);
	vecGeoref = GetLastUsedGeorefObject(CntyVec);

#	PopupMessage("Script Activated")
   }

### function called when datatip event is triggered
func OnViewDataTipShowRequest (
   class GRE_VIEW view,				## predefined class variables
   class POINT2D point,
   class TOOLTIP datatip
   ) {
   numeric retval = 1;				## in GraphTip use only what is created by script

	trans = view.GetTransLayerToScreen(cntyLayer, 1);		## get transform from screen to layer
	ptLayer = trans.ConvertPoint2DFwd(point);					## cursor position in layer coordinates

	polyNum = FindClosestPoly(CntyVec, ptLayer.x, ptLayer.y, vecGeoref, 0);

	total = CntyVec.poly[polyNum].ProvStats.TOTAL;			## get values for households for polygon
	rural = 360 * CntyVec.poly[polyNum].ProvStats.RURAL / total;
	urban = 360 * CntyVec.poly[polyNum].ProvStats.URBAN / total;
	string name$ = CntyVec.poly[polyNum].ProvStats.PROVINCE$;
	numeric pop = CntyVec.poly[polyNum].Population_PRV.Population;

	gc = imagedev.CreateGC();			## create graphics context for graph tip
	gc.SetColorName("white");			## fill white rectangle with black border for label background
	gc.SetLineWidth(1, "pixels");
	gc.FillRect(1,60,83,50);# 1 60 84 50
	gc.SetColorName("black");
	gc.DrawRect(1,60,83,39);# 1 60 82 39

	gc.DrawTextSetFont("ARIAL.TTF");
	gc.DrawTextSetHeightPixels(13);
	gc.TextStyle.RoundWidth = 1;

	color.Name = "black";				## draw title for label area
	gc.SetColor(color);
	gc.DrawTextSetColors(color);
	numeric textsize = gc.TextGetWidth(name$); ## demir
	gc.DrawTextSimple(name$, (85-textsize)/2, 72);
	gc.DrawTextSetHeightPixels(11);

	## draw pie slice for urbans
	color.Name = "red";
	gc.SetColor(color);
	gc.FillArcWedge(42, 30, 25, 25, 0, urban);
	gc.DrawTextSetColors(color);					## draw label and percentage in same color 
	gc.DrawTextSimple("Urban:", 5, 83);
	percent$ = sprintf("%.1f\%", urban / 3.6);
	start = 80 - gc.TextGetWidth(percent$); 	## compute start position for percent to right-align
	gc.DrawTextSimple(percent$, start, 83);

	## draw pie slice for rurals
	color.red =0;		color.green = 0;		color.blue = 255;
	gc.SetColor(color);
	gc.FillArcWedge(42, 30, 25, 25, urban, rural);
	gc.DrawTextSetColors(color);					## draw label and percentage in same color 
	gc.DrawTextSimple("Pop:", 6, 95);
	string pop$ = sprintf("%d", pop);
	start = 80 - gc.TextGetWidth(pop$); 
	gc.DrawTextSimple(pop$, start, 95);

		if (name$ <> ""){ # the data is available or not?
		### set the rendered image and mask as source for the GraphTip
		datatip.SetImageTip(imagedev, maskdev);
	   return retval;
		}
   }