drawing a lightning! how to?

[sonicfire]

so for example i have this:

no problem using lineto.

but, what if i want to do this ?


i´m simply not sure about the maths here. anyone could guide me?
i always have source and target coordinates but how would i go about "dividing" this
line into lets say 8 [img]lineto[/img]´s with slight random variations but still point to the target?

anybody could help me? would be much appreciated thanks!!

[Hblade]

Hmm, thats a hard one.

You can always try:

Code: Select all

for(i=0;i<(distance(x,y,target.x,target.y)/2);i++) {
moveto(x, y);
lineto(i, i);
lineto(i, i);
lineto(target.x, target.y);
}


Untested, but might create a stagger in th emiddle.


There is another method but it's a long rout to take.

[sonicfire]

Thank you Will give it a try!

[Game A Gogo]

Here's my version

Code: Select all

int i,rx,ry;
int Crack=25,Force=25;
setpen(0,127,255,0,3);
moveto(0,0);
for(i=0;i<Crack;i++)
{
    rx=(rand(2)-1)*((float)i/Crack)*Force;
    ry=(rand(2)-1)*((float)i/Crack)*Force;
    lineto(((float)i/Crack)*width+rx,((float)i/Crack)*height+ry);
}

variable Crack is how many segment should crack and Force is the intensity of the cracking.
note, the cracking intensity is graduate, so it starts smoothly to more and more

[Game A Gogo]

exemple that follows the mouse (put in draw actor)

Code: Select all

int i,rx,ry;
int Crack=25,Force=25;
erase(0,0,0,1);
setpen(0,127,255,0,3);
moveto(320,240);
for(i=0;i<Crack;i++)
{
    rx=(rand(2)-1)*((float)i/Crack)*Force;
    ry=(rand(2)-1)*((float)i/Crack)*Force;
    lineto((((float)i/Crack)*(xmouse-320)+rx)+320,(((float)i/Crack)*(ymouse-240)+ry)+240);
}

or

Code: Select all

int i,rx,ry;
int Crack=10,Force=10;
erase(0,0,0,1);
setpen(0,127,255,0,3);
moveto(320,240);
for(i=0;i<Crack;i++)
{
    rx=(rand(2)-1)*min(1,((float)i/Crack)*3)*Force;
    ry=(rand(2)-1)*min(1,((float)i/Crack)*3)*Force;
    lineto((((float)i/Crack)*(xmouse-320)+rx)+320,(((float)i/Crack)*(ymouse-240)+ry)+240);
}

[sonicfire]

amazing, thanks very much!
thank you both