Heya
Once again, I played with curves and alpha values, and I got something which looks pretty nice. It's totally unoptimized, it's more a proof of concept than a project or anything else.
How it works ?
- Calculate the Coordinates of the next point (I used parametric equations of Quartics I guess, but surely of higher degree too). If you loop through a variable to calculate those coords (like with angles : from 0 to 2*pi), don't hesitate to use a really small step (I used a 0.005 step), it'll ask more CPU time, but the result will be more easily controllable.
- To render, I used a superposition of 3 shapes (I used circles) with decreasing radius and increasing alpha. Both first circles are filled, the last one is not. Play also with the color ! (you can use your counter variable to slightly move a component of your colors.
- If you want movement, use another counter variable which'll be increased slowly and added in some of the equations members (eg : Cos(Angle+NewCounterVariable) )
Play with those tthree steps, and you'll have a nice transparent/neon colors on your moving shapes
If anyone is interested with this method, I'd be really glad to see some creations in this post !
Attached : Screenshot, Rar(SRC+BIN)
Source :
#include "fbgfx.bi"
Screenres 640,480,32,2,fb.GFX_ALPHA_PRIMITIVES
dim as single x,y
dim as integer col,gridX,gridY
dim as single alphat,tglob,oldtglob,oldoldtglob
WindowTitle "Curves"
color ,rgb(25,25,25)
Do : screenlock : cls
For t as single = 0 to 2*3.1415926535 step .005
'' forme 1
x = cos(t+tglob*.2)*cos(t+tglob)*cos(t+tglob*2)
y = sin(t+tglob*.7)*sin(t)*sin(t)
x *= 100
y *= 100
Circle(200+x,140+y),7,rgba(t*25,250,230,alphaT/8),,,,f
Circle(200+x,140+y),6,rgba(225,225,225,alphaT/4),,,,f
Circle(200+x,140+y),5,rgba(t*20,250,150,alphaT/2)
'' forme 2
x = cos(tglob)*cos(t+tglob)*cos(t+tglob)
y = sin(t+tglob)*sin(tglob)*sin(t)
x *= 100
y *= 100
Circle(440+x,140+y),7,rgba(t*25,250,230,alphaT/8),,,,f
Circle(440+x,140+y),6,rgba(225,225,225,alphaT/4),,,,f
Circle(440+x,140+y),5,rgba(t*20,250,150,alphaT/2)
'' forme 3
x = cos(tglob)*.5+cos(t*.1+tglob*.1)/cos((tglob + t)*2)
y = sin(t+tglob)*sin(t)*sin(t*.5)*cos(tglob)
x *= 100
y *= 100
Circle(320+x,340+y),7,rgba(t*25,250,230,alphaT/8),,,,f
Circle(320+x,340+y),6,rgba(225,225,225,alphaT/4),,,,f
Circle(320+x,340+y),5,rgba(t*20,250,150,alphaT/2)
next
alphaT = 12
tglob +=.03
Screenunlock : sleep 1,1
Loop until multikey(&h01)
