On 03/24/2011 12:05 AM, John Spikowski wrote: > On Wed, 2011-03-23 at 23:03 -0400, Kevin Fishburne wrote: > >> That will probably work, but there should be a mathematical way to >> compensate for not cropping the image twice, or even once. As long as >> the entire image is preserved by the rotation function (it is) and it >> behaves in a predictable manner (it does), the camera's coordinates >> should be able to be translated and rotated so that they are in the same >> position in the rotated image as they were in the non-rotated image. For >> the sake of efficiency that is what I'm trying to accomplish. > This thread might help. (or not) > > http://forums.libsdl.org/viewtopic.php?t=2983&sid=1d2c6a94470c0fd56f3f542cd702ec37
No go, but thanks for trying to help. Right now my code looks something like this: ' Convert camera coordinates to their distance from the center of the tile grid. newcx = newcx - (bworkspace.Width / 2) newcy = newcy - (bworkspace.Height / 2) ' Rotate camera. newcx = Cos(Rad(- Client.orientation)) * newcx - Sin(Rad(- Client.orientation)) * newcy newcy = Sin(Rad(- Client.orientation)) * newcx + Cos(Rad(- Client.orientation)) * newcy ' Adjust the camera coordinates to fit the rotated tile grid. newcx = newcx + (brotated.Width / 2) newcy = newcy + (brotated.Height / 2) ' Draw the rotated workspace centered on the camera and cropped by the render window size. Draw.Image(brotated, 0, 0, swidth, sheight, newcx - swidth / 2, newcy - sheight / 2, swidth, sheight) First I figure out the distance of the camera from the center of the non-rotated image. Then I rotate the camera using those distance values as the camera's coordinates. That should in effect make the center of the non-rotated image the origin of rotation. I then take the rotated camera values and add them to the center point of the rotated image to determine the camera's position in the rotated image. Maybe my logic is wrong, maybe it's my math. Maybe demons are hovering over my shoulder casting black magic. I'm about to hit up Facebook for an old math whiz I knew in high school, as gamedev.net has failed me as well. <blood curdling Arnold scream from Predator> -- Kevin Fishburne Eight Virtues www: http://sales.eightvirtues.com e-mail: [email protected] phone: (770) 853-6271 ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Gambas-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gambas-user
