Develop Reference

Autocad .NET - Get Layer width and height for plotting

i'm struggeling a little with my Autocad Plugin..
Since i have a huge amount of AutoCad Drawings to plot programmatically as a pdf-File i found out that some of them contain much unnecessary stuff on it.
i only want to plot a specific area which is defined in a layer. I have no problem of search for the layer and check for its properties but i can not find a single thing about coordinates or something like a height or a width..
So my question is simple: Is there a chance to get the height and width or something like that to print only the needed stuff inside the area of that layer?
Thanks
Alex

If you have a selection set of all the entities you want to plot, loop through and get each entities extents.
Compare each entity against a return value and grab the largest min and max points of everything in your selection set. This will give your the window area bounds you want to plot.

Dynamic-Data-Display WPF Changing the ChartPlotter's default behaviour to moving instead of scaling

I have some data that comes via messages to my chart. It's a electric current over time (seconds) chart. How can I change the behaviour of the FitToView mode (or write a different one) so that the plotter doesn't zoom out and scale to fit the whole line graph, but move left instead, showing for example only the 100 last seconds?
I thought of calculating minimums and maximums every message and changing the plotters restraints explicitly but it doesn't seem very optimal. Also due to the fact that I would have to set the restraints in code-behind but all the data is in the ViewModel (using MVVM with caliburn).
Edit: I've found the functionality for this (adding WidthFollowConstraint to the FitToView constraints) but the linegraph gets moved more than the axis and after that it compensates back to where it should be, making the whole graph glitch out on every iteration. How can this be fixed?

Apperently I forgot to answer this.
I made the graph move instead of scale by adding a MinimalSizeConstraint and a FollowWidthConstraint to the ConstraintCollection in the constructor of the D3 Viewport2D class. The names are pretty selfexplanitory. Basically this changes the FitToView funtion of the graph to the desired behaviour

VISIBLOX, WPF: Getting chart points to scroll horizontally?

I'm using the Visiblox WPF API and am having trouble getting the chart points in my line chart to scroll horizontally. Instead of scrolling, the points are get squashed together, in which, this isn't particularly a problem, except that I expect to have 100s of data points on the chart. I have looked throughout the examples available on the Visiblox website, but couldn't find what I was looking for. Ive attached an example screenshot.
Any ideas?
Thanks for your help,
Sparky

By default Visiblox Charts will re-calculate the range to include all the data in the series, so there are two possible approaches: 1) when you add the last point, remove the first one which will effectively move the visible window one point over or 2) set an explicit axis range and update that when you want to move the visible window.
Check out the Visiblox blog for more details on how ranges work at: http://www.visiblox.com/blog/2011/03/visiblox-charts-ranges-demystified

I just had something like this recently. Everytime I'd add a point to the cart I'd run a little section of code that would check the amount of time (my x-axis dimension) that had passed since 0. I also set up a range of data I always wanted to see. I always wanted to show 120 seconds of data on the graph. So I had something like this:
private void adjustXasis(int timeCount)
{
if(timeCount>desiredRange)
{
chart.axis.Xaxis.minimum=timeCount-desiredRange;
chart.axis.Xaxis.maximum=timeCount;
}
else //two minutes not reached yet
{
chart.axis.Xaxis.minimum=0;
chart.axis.Xaxis.maximum=desiredRange;
}
}
I don't have VS in front of me and I know that syntax for the axis min/max is wrong but you get the idea.

By default Visiblox Charts will re-calculate the range to include all the data in the series, so there are two possible approaches:
1) when you add the last point, remove the first one which will effectively move the visible window one point over or
2) set an explicit axis range and update that when you want to move the visible window.
Check out the Visiblox blog for more details on how ranges work at: http://www.visiblox.com/blog/2011/03/visiblox-charts-ranges-demystified

Drawing a map based on an array, and applying run time changes

I am writing a program to control a mobile robot. One of the things it has to do is to draw a map of the "world" as the robot senses it and apply changes in the map as it senses them.
It also has to highlight in some way the location of the robot and (ideally) the direction it points to.
I currently have an auto-updating array (100 x150) representing the map, using the following representations: 0 represents a clear path, 1 represents an obstacle.
I also have a variable containing the robot's location and next location.
What I need is to visualize it. I thought about using labels, but it is way too tedious using them, and the end result is not so pretty. My other possibility is to write all that data into an Excel spreadsheet, but then I will be back to square one: visualizing the data in an attractive way. Is there a drawing package of some sort that can do the job?
To sum it up:
Using:
- int[] MapArray //100 x 150 array representing the robot's world, and the data there is changing.
- Point[] Locations //Locations[0] is the current location, Locations[1] is the next step.
And I want to draw a map on a Windows Forms application that updates itself in a nice visual manner.
I hope my question is clear enough, don't hesitate to contact me if not!

Try Code: Drawing a Filled Rectangle on a Form (Visual C#) or something similar.
Graphics Programming Example Topics
Just write a couple of cycles which accesses every cell of an array and draws a rectangle on a form according to coords - that's the simplest way.
for(int i=0; i<100; i++)
{
for(int j=0;j<150;j++)
{
<access[i,j] and draw a rectangle with color accordingly to your contents.>
}
}
The same for the drawing location.

If you don't find any nice controls, you can always use a DataGridView with the column width = row height so that it always displays square cells. After that, just change the background color of the obstacles.
You could also look into observable collections for the map array so that the grid updates based on events rather than on timers. Make sure that you overwrite the observable collection to send the CollectionChanged event even when a cell changes its value, not only when adding/removing cells.

Display unsorted data in SL3 line chart

I'm having trouble with my Silverlight Chart. My model is unsorted, that is, the sorting is done on the server side. It needs to support year transitions, but as you can see from the screenshot the charting control automatically sorts the model and fills in the gaps. The line sort be ever increasing and not taking a dip on new year.
How can I make the chart display the data in the order specified in the grid control to the left?
Btw, using SL3
alt text http://img705.imageshack.us/img705/7602/unsortedsilverlightchar.png

The line chart is not designed to do the task you seem to be asking. After all the purpose of a line chart is to help the user trace a trend or even visually interpolate an interim value. However if the interval between horizontal points is not linear and always traveling in the same direction such lines meaningless.
I would therefore suggest that the Line chart is not appropriate or that you have some other hidden data which should be used for the Y-axis which would make the lines meaningful.
Alternatives might be to use a Scatter graph or a Column series where the y-axis value has been converted to a string and thus cause the series to use a Category based axis instead of range based one.