Scrawl-canvas v8 - Particles test 015

Test purpose

• Create a point emitter which generates new particles that take their initial positions from the history array of existing particles.
• Check that the generated particles move only at specific angles (multiples of 60 degrees, all rotated by 15 degrees)
• Check that the tween correctly updates the color range for new particles

Known issue: the Demo in Safari differs from other browsers as that browser is over-tolerant to retaining previous paints during the clear stage of the Display cycle (based on the Cell wrapper's 'clearAlpha' attribute's value).

Touch test: not required

Annotated code