ImageLibEx library

[agraham]

Originally Posted by Byak@

How can i rotate image for some degrees?for example 37 degrees?

Version 1.1 posted with new method BitmapEx.Rotate which rotates a bitmap an arbitrary number of degrees. Note that it you want to merge the source for a device app you need to put a SIP(False) statement in your App_Start if you do not already use SIP else where. This forces the Basic4ppc to reference a .NET assembly that itf would not otherwise do and that is required for merging. This need will be removed with the next version of Basic4ppc.

[Byak@]

ooops)big thanks agraham!

[wolfgang]

Hi agraham,
I tested the new features and especially ROTATE works very good and fast in steps of 90° (about 150 msec for an image with 240 x 240 pixels) on my HTC. But 90° is a little too much for “Course Up” with my moving map system. The maximum deviation is 45°. When I rotate the map with the raw heading it takes up to 1800 msec and this is too slow. Is it possible to optimize the rotation for steps of e.g. 30° or 45°. May be we can (you can) replace the trigonometric functions with a constant and this will be much faster??
BTW: Using ROTATE clock- and counterclockwise would be unbelievable!

[agraham]

Originally Posted by wolfgang

replace the trigonometric functions with a constant

I already did. It was reasonably optimised before but now I have moved as much out of the main loop as I can. Try this modified library and post here how it goes. It may be a little improved but this is as fast as it is going to get in a .NET library unless I can think of a better algorithm - and I doubt that!

[wolfgang]

thank you. Can you please upload the cs files as well because I don't develop on the device.

[agraham]

Originally Posted by wolfgang

thank you. Can you please upload the cs files as well because I don't develop on the device.

Just copy ImageLibExDevice.dll to your device with your compiled app. I'll sort out cs files and help once I have determined what is going in the next release.

[wolfgang]

Hi,
first off all: congratulations!
Tested on HTC Cruise 3650 WM 6.0 Pro (Qualcomm® MSM7200™, 400MHz). Image size 240 x 240 pixels (bmp or gif doesn’t matter).
90°, 180° and 270° ~ 130 msec
5° ~ 400 msec
45° ~ 600 msec (45° is the slowest)
That’s very cloth to perfect. Now I have to optimize my code. Thanks’ again.

[wolfgang]

Hi,
Rotate(180,cWhite) and Flip create a mirror image!? Flip may be correct but not Rotate. This happens on desktop and device with both versions.

[agraham]

Originally Posted by wolfgang

Flip may be correct but not Rotate.

Flip is correct but Rotate 180 isn't. Sorry, bad attempt at optimisation . I'll soon release version 1.2 with this corrected, all the rotations slightly more optimised and a couple of other changes and additions.

[agraham]

Wolfgang. Please check this interim version out before I finalise the next release. I have fixed the rotate and added a new rotate method, Rotate180.