problem description
accidentally found the following picture of such an effect of a page, the effect is very good, but the source code is compressed can not see, would like to ask the experienced boss, the idea to achieve this effect.
general idea (guessed)
1 Diffusion
weighted average of each point according to the surrounding points (similar to Gaussian blur)
2 dilution
every time using translucent black layer to make full canvas Alpah Blending (canvas seems to have a way to do it directly without having to do it point by point)
Previous: Tencent Map mobile trigger event problem