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County route 517 leaves Hackettstown, NJ as High Street, heading north. Not far past the huge Mars candy plant on the outskirts of town the road lifts itself up and over the shoulder of Allamuchy Mt., and then it is just 517, the road to Andover and Sparta. As you drive northward past the little crossroads town of Allamuchy,sheltering in the shadow of two highways and what is really a large hill, a broad valley opens up on your left. It is typical northern New Jersey farmland, rolling and rich, stitched into quilted patterns by old stone walls, bits of forest, and wandering streams. This is the valley of the Pequest River,  which has its start in Stickles Pond high on the slopes of Wawayanda, where they call it a creek. Down here in Warren County it is a river, whatever those Sussexers might say.

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Last time out I introduced the DragHandle class, a small control that can be placed on a Canvas and moved around with the mouse. DragHandle is meant to provide one of the building blocks of shape editing in an application I have been working on. I ended that post with the DragHandle built and working, but still requiring quite a bit of plumbing to do what it was designed for: affect properties of shapes. In this post I’m going to show you the class that provides the rest of the mechanism for dragging objects: the DragHandleConnector. After that I am probably going to take a break and actually write some more code. As with the previous post I have linked the source file(s) at the bottom. I am not going to distributed binaries on these because they are part of larger libraries that I am not ready to publish, but you can easily build the control and supporting classes from the source files.

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In my last post on the Silverlight drawing project I said I was going to stay away from the design and talk about code next. Quite a bit has changed, though, since then. For one thing the DrawStylus class has fallen victim to shrinking relevance and has been removed. The operations I initially envisioned for it kept leaping to other classes until it was nothing more than a forlorn wrapper around the mouse events. Oh well. Sometimes you have to be ruthless. Some additional classes have appeared, notably the StyleBox and StyleControl, which have about the same relationship as ToolBox and Tool, but are focused on editing styles. StyleBox derived from a StackPanel, and I’ve found that works very well, so I will probably be going back and changing ToolBox to derive from one as well.

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I see a lot of questions on the Silverlight.Net forums about control layout. Typically they follow the general pattern “I placed a {insert control} into a {insert container}, but {insert problem} is happening. Can you help?” I thought it would be useful to cover the main types of control containers available in WPF and Silverlight, and catalog the differences in their default behavior with respect to layout.

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When you start to design an application for producing drawings in Silverlight, there are some things you don’t have to worry too much about. You don’t have to come up with definitions for shapes, or figure out a fast way to render them. You don’t have to define a color space, and gradients, and geometries for clipping and filling. You don’t even have to define what a surface is and how shapes interact with it. Windows Presentation Foundation takes care of all of that stuff, and quite nicely too.

What you do have to think about is how to organize and present that capability to the user, and how to connect the user’s intentions to the underlying systems. You need to think about how to do all that in a robust and extensible manner, in an environment that is quite a bit more constrained than the context in which a normal WPF app runs. In other words, you need everything but all the stuff I mentioned above, and that still leaves quite a lot to chew on.

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I’ve decided to write a couple of posts about the design and execution of a Silverlight application I’m working on. If you’re not familiar with Silverlight, here it is in one sentence: Silverlight is a downloadable subset of the WPF containing just enough of the framework to execute specialized WPF applications in a browser window. It’s a competitor to Flash, without doubt, but since I never really went in for doing games and demos in Flash I don’t really think about the positioning. Silverlight lets you animate, and play sounds, and do all that cool stuff that I think of when I think of Flash. But Silverlight also has everything you need to do lightweight, browser-hosted, net-delivered applications. I don’t know if people do many apps in Flash, but that’s the part of Silverlight that gets me excited. If you think about all the datacenter cycles that get spent pushing ASP roundtrips to update the front-end, Silverlight starts to look pretty damn appealing.

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This post is about an online fantasy role playing game called Warhammer Online: Age of Reckoning. It is developed and operated by Mythic, now a division of Electronic Arts. I’ve been playing it for about a month now, on the Iron Rock server, with a bunch of former Dark Age gaming buddies. You would think I am too old to be wasting time on something like that, and, in the end, the point of this essay may be that you’re right. At least, it may be that online role playing games have moved on, and I haven’t. In any case, this isn’t going to be a very positive post, and I’m sorry about that. Mythic got monthly subscription dollars from me for Dark Age of Camelot for years. I wanted Marc Jacobs to succeed with Warhammer Online, and it may well be that he will, but it doesn’t look good from here.

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There’s something a little melancholy, for me, in walking along an abandoned railroad. I feel it whenever I explore the remains of our national past, but old rights of way bring it out most strongly. Partly this is because I was always a little bit of a railfan, and partly it is the significance of these narrow strips of landscape, empty and overgrown where once great steam engines chugged along hauling the commerce of a young country. A century and a half ago the great men of the day gathered in smoke-filled rooms and clinked their glasses in celebration of the last rail layed and the last spike driven, and yet now it is all just memory.

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The sandy loams of the Pine Barrens of Southern New Jersey are a porous filter for the water that trickles through purifying layers to feed one of the largest aquifers on the East Coast. Hours after the rain has fallen the ground is for the most part dry again, and undisturbed. Into this same ground has been poured, over the centuries, the hopes and dreams of generations of entrepreneurs. The woodcutters, colliers, iron and paper mongers, would-be glass barons, and land speculators have all thrown their best shots at these seemingly endless miles of forest, meadow, river, spung, and swamp, with as little effect. To decamp in the middle of these woods today, in Lacey Township, or perhaps old Shamong, is to find yourself set back 200 years to the turn of the eighteenth century. Before and behind you are the miles of rutted sand roads. Around you the wind moans in the cedars and oaks. There seems to be no sign of the place this once was, and yet, something gleams dully from under a thick carpet of spring greenery.

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My feet wandered back into the area of old Millbrook this weekend, and I expect they will tread that way again soon, and hopefully for years to come. This region, like the Pine Barrens in the Southern part of the state, completely fascinates me, and for the same reason. For such a small state New Jersey must be unique in having two such areas of restored wilderness. I say restored because in both the Pine Barrens, which make up much of the Southeastern corner, and the Highlands, which take up the Northwestern, civilization once thrived. Agriculture, mining, lumbering, manufacturing, transportation; every major enterprise of eighteenth and nineteenth century America was engaged in on these Northern slopes, and those Southern plains. Today there are, for the most part, just the woods, the hills, the sandy trails and woodland tracks that were once arteries, and the little dots on old maps that mark the towns.

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