rain loop

[Mike]

Hi
for a rainsimulation i do new drops(class) and set x/y. finally at the
end of loop I do delete the pointers.
Now:
- how could i increase the life span of the drops? Actually they are
drawn and immediately (loop end?) gone.
- how to add a trail? i load another image slightly below in y but to
make it longer(repeate) with wind.
I don't understand how to shape the loop.
Many thanks
Michael

 

[Mike]

the loop is alike:
for(int i=0;i<num;i++)
{
drops = new droplet
.........
if(drops->
...........
// then i tried a fadout before draw but that's not working as
always new drops at different x/y are created
FadeOUT();
}
//after we are done, clean the mess
for(drawed=0;drawed<num;drawed++) delete drops

How should i take it out the loop? I want to show the drops ~2 second
and fade away
Thanks

 

[Mike]

ok now i try without pointers but get:

cannot convert ‘GLfloat*’ to ‘GLfloat’ for argument ‘1’ to ‘void
glVertex2f(GLfloat, GLfloat)’

thanks

 

[Nick Keighley]

for a rainsimulation i do new drops(class) and set x/y. finally at the
end of loop I do delete the pointers.

which doesn't need dynamic allocation...

Now:
- how could i increase the life span of the drops?

don't call delete. I'm serious if calling delete at the end of the
loop is giving you raindrops the wrong lifetime then move the deletion
point.

Actually they are
drawn and immediately (loop end?) gone.
- how to add a trail? i load another image slightly below in y but to
make it longer(repeate) with wind.
I don't understand how to shape the loop.

we don't know enough about your application/OS/graphics lib. But
something like this:

void timerEvent(Time time)
{
if (time_to_create_a drop (time))
add_to_drop_collection (drop_collection, new_drop());

if (time_to_remove_drops (time))
remove_old_drops (drop_collection);

if (time_to_draw (time))
draw_stuff (drop_collection);
}