With d3.geo, i want to draw a map with a projection that i do not want to find by try&error, but with a visual tool to help me along.
There is a tool out there: The Visual Map Configurator for Kartograph.js. Is there any tool i can use to generate a projection for d3.geo?
How do you find the projection you want, without try&error? I can get the origin parameters from any map but for scale and translate?
While not as polished as Kartograph's configurator, if you clone the D3 git repository, you'll find three examples with sliders to control the projection settings:
If you're using an azmithal projection, you can also try dragging this interactive globe and then use the JavaScript Console to extract the origin (projection.origin()).