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Thursday, April 30, 2009

Area fill algorithm: crayons and coloring book

by Calvin_Hsia via Calvin Hsia on 4/30/2009 5:40:00 PM

Kids know how to use crayons and a coloring book. How do you write such a program? In my last post ( Which pixels do you turn on when you draw a line? ) I showed how to draw a line. Now suppose you have some lines or shapes already drawn. How would you write code to fill in an area bounded by the drawn pixels? IOW, imagine you’ve drawn a circle. You want to fill the circle with a color. Right click inside. What code should run? Wha ... [ read more ] 4 comment(s)

Data Binding WPF Lookup Combobox Values to EF Entities

by Beth Massi via Beth Massi on 4/30/2009 2:57:00 PM

It’s extremely common to have to hook up lookup tables on your data entry forms in order to populate foreign keys in a database. I’ve talked about how to do this in Winforms and WPF with Datasets and LINQ to SQL before: How Do I: Create a Lookup Combobox in WPF? How Do I: Create a Master-Detail Data Entry Form in WPF? How Do I: Create Lookup Lists? Creating Lookup Lists with LINQ to SQL Related Data Binding and ComboBoxes with LINQ to SQL Ti ... [ read more ] 3 comment(s)

When using LINQ to XML why don’t I get results if I don’t import a XML namespace (Daniel Walzenbach)?

by VBTeam via The Visual Basic Team on 4/30/2009 12:20:00 AM

Hi, I posted a bit of code the other day which I used to get a list of all Code Snippets we ship in Visual Studio . In a nutshell, I used XElement.Load to create a new XML document from a filename from which I then read elements from (There are way to many ‘”from” in this sentence ;-) ). Unfortunately, I forgot to import the XML Namespace in the code I posted which caused my code not to return any results (but instead provided me with a brilliant opportunity to write another post. he ... [ read more ] 1 comment(s)

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