Any comments on this approach and how to implement it?Īdditionally, I have been using ChartSmith for making charts and really like the features and ease of use. So now my thinking is to create the map display once and store it as a pdf in memory. Then, instead I thought it would be nice to cache the display somehow so that the user could zoom in and out as desired and avoid the time it would take to build all these paths. But this seems like it would hit the database too much and slow the display. At each hit an NSBezierPath is created for all those objects. I thought about hitting the database for each legend class, for example, all interstates have the same attributes of linesize a, linecolor black, then hitting it for the next legend class, secondary roads, line size b, linecolor red. The situation would be that there are several geometries having the same display attributes: line size, line color, fill color. Where I am getting lost is conceptually how to handle these things. So at this point I can more or less (still working on it) retrieve the geometries and put them into NSBezierPath. Here are example inputs as defined by generally accepted standards:
Now I would like to be able to display the map geometry objects. I have toyed with data storage via SQLite and have that functionality down using an SQL interface. I work in the field of geographic information systems (GIS) so this would have some real value for me. I want to develop a larger project now that I have finished some tutorials and the thing I most want/need is a map viewer. I have been learning Cocoa (slowly in between school and a new baby) and have made some progress.
0 kommentar(er)
