On May 5, 2015, at 10:06 AM, Robby Findler <[email protected]> wrote:
> One of the issues is that the racket/draw version is not doing the > cropping that the 2htdp/image version is doing. Changing the > "scene+line" call in utils.rkt to "add-line" cuts the freeze time in > half for me (using size 242 instead of 728 in the time.rkt file). I > didn't check to see if lines go outside the shape, but if they do, you > might consider just using some arithmetic comparisons there in > util.rkt instead. At first, I was using add-line, but then switched to scene+line because at first the lines were sometimes going outside the shape, and when that happened on the left (or the top), it would effectively shift the whole image to the right, but it would still draw the next line too far left, shifting the rest of the image even more right, and I ended up with an image with a little bit of what I wanted on the far right, and a little bit of what I wanted on the far left, and in between a trail of tiny lines oriented in weird directions. I had kind of assumed that scene+line might be faster because it could be “translated” into just adding a line to a bitmap, while I thought add-line would be slightly more expensive because it had to adjust the bounding box when it went outside the image, but I guess I was wrong. So thanks for the suggestion! > With that change, then I see the time for freezing being the same as > the time for the racket/draw version to draw. That’s not what I see for size 728: (time (snowflake/inner-fractal 728)) : cpu time: 14822 real time: 14847 gc time: 2327 (time (freeze img1)) : cpu time: 197506 real time: 197911 gc time: 102407 (time (snowflake/inner-fractal/draw 728)) : cpu time: 23638 real time: 23646 gc time: 5495 Where before it was: (time (snowflake/inner-fractal 728)) : cpu time: 14775 real time: 14874 gc time: 2304 (time (freeze img1)) : cpu time: 377110 real time: 377867 gc time: 198343 (time (snowflake/inner-fractal/draw 728)) : cpu time: 24257 real time: 24267 gc time: 5852 So it did significantly reduce the time for freezing it, but it’s still about 8 times slower than using racket/draw. Alex Knauth -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
