Re: Antialiasing with GD..?

The jpgraph graphing package written in PHP has such an anti-aliasing line draw routine written in PHP and it isn't actually that slow. Check it out at http://www.aditus.nu/jpgraph/ -Rasmus On Thu, 13 Dec 2001, Phil Driscoll wrote: > On Wednesday 12 December 2001 8:35 am, Jan Maska wrote: > > Hi, > > I have the following problem: > > > > Using the database, I create a graph like __.------._.--._/\.__ > > In order to keep exact colors and prevent a JPEG detail distortion, I use > > PNG format as output. > > This has one disadvantage: all lines are rough and I don't know how to > > antialias them. > > > > Can anyone help? > > I've never done this in PHP but clearly writing your own antialiased line > drawing algorithm in PHP will most likely produce something which runs too > slowly, so you need to do what you can in external libraries. > > I would draw the line into a bitmap which was exactly twice the size required > and then scale the image back to the correct size when you've done with > imagecopyresampled. > > Cheers > >