[Drawkit] Programmatically adding shapes

[Brad Larson]

I've dug down into the framework and I've gotten lost in trying to  
figure out how to programmatically add a shape.  Currently, all  
addition of new objects is done via a DKDrawingTool, where you set up  
a prototype object for that tool.  Mouse events are passed to the  
tool, which interprets them to draw the shapes, and attach them to the  
current layer.  For loading a file from disk in a non-native format,  
you'll need to parse the file and add objects programmatically with  
the properties specified in the file.  I tried following the  
initWithCoder methods all the way down, which might make this clear  
due to their internal functioning, but got lost.

My crude start is this:

// Initialize the drawing object
DKDrawing *dwg = [[DKDrawing alloc] initWithSize:NSMakeSize(100, 100)];

// The following is based off of the DKDrawing makeDefaultDrawing
// attach a grid layer
[DKGridLayer setGridThemeColour:[[NSColor blackColor]  
colorWithAlphaComponent:0.5]];
DKGridLayer* grid = [[DKGridLayer alloc] init];
[dr addLayer:grid];
[grid tweakDrawingMargins];
[grid release];
	
// attach a drawing layer and make it the active layer
DKObjectDrawingLayer*	layer = [[DKObjectDrawingLayer alloc] init];
[dr addLayer:layer];
[dr setActiveLayer:layer];
[layer release];
	
// info layer
#ifdef ADD_INFO_LAYER
	DKDrawingInfoLayer*	infoLayer = [[DKDrawingInfoLayer alloc] init];
	[dr addLayer:infoLayer];
	[infoLayer setVisible:NO];
	[infoLayer release];
#endif
// attach a guide layer
DKGuideLayer*	guides = [[DKGuideLayer alloc] init];
[dr addLayer:guides];
[guides release];

// Create a shape to be inserted into the drawing
DKDrawableShape *currentShape = [[DKDrawableShape alloc] init];

// Make this shape a rectangle starting at (0,0) and ending at (50,50)
[shape setPath:[DKShapeFactory rect]];
[shape moveToPoint:NSMakePoint(0.0, 0.0)];
[shape setSize:NSMakeSize(50.0, 50.0)];

I don't know how to proceed.  Do I add the shape to the active layer?   
If so, how?  I might also need to set a style in there, somewhere, for  
the shape.  Should I be doing this through a DKDrawingTool instead?

I can probably figure this out if I spend some more time reading  
through the code, but I wanted to see if there might be an easier  
explanation for the process.


______________________
Brad Larson
SonoPlot, Inc.
3030 Laura Lane, Suite 120
Middleton, WI 53562