How to draw curve?

[sportmaster]

How to draw curve from point to point with canvas ? I also would like to know how to draw sine wave and of course circle, and maybe sphere with gradient filling.

[Bee-Ant]

For wide circle, it seems you can't draw it with solid line...only with dotted line...
Here's the code if I'm not mistaken...

Code: Select all

int i,xx,yy,R=100;
erase(0,0,0,1);
for(i=0;i<360;i++)
{
    xx=cos(degtorad(i))*R;
    yy=sin(degtorad(i))*R;
    setpen(255,255,255,0,1);
    putpixel(width/2+xx,height/2+yy);
}

[sportmaster]

The circle looks... so, so, but the code is smart and I can't deny it is a circle, and what about just one curve line ? Is it possible to draw solid ?

[lcl]

You can make is smoother by adding another one, little bit larger and transparent circle under it.
Like this:

Code: Select all

int i, xx, yy, R = 100;
erase(0, 0, 0, 1);

for (i = 0; i < 360; i ++)
{
    xx = cos(degtorad(i)) * R;
    yy = sin(degtorad(i)) * R;
    setpen(255, 255, 255, 0.5, 4);
    putpixel(width / 2 + xx, height / 2 + yy);
}
for (i = 0; i < 360; i ++)
{
    xx = cos(degtorad(i)) * R;
    yy = sin(degtorad(i)) * R;
    setpen(255, 255, 255, 0, 2);
    putpixel(width / 2 + xx, height / 2 + yy);
}

Just edited Bee-Ant's code.

[jimmynewguy]

Kall's brother showed us a way of counting a circle path a whiles back, i just put that code in a canvas and you don't get a pixley one. But he wants a curved line so this doesn't help. Guess I'll make another one if i find time in the next couple of minutes

[Bee-Ant]

Kall's brother

Kall's brother?you mean Kalladdolf's???
Who's he?

[jimmynewguy]

yea, you were in this discussion bee!
viewtopic.php?f=5&t=4600&hilit=counting+a+circle+path&start=15

[Bee-Ant]

yea, you were in this discussion bee!
viewtopic.php?f=5&t=4600&hilit=counting+a+circle+path&start=15

Owh, what an old topic...no wonder I forgot it

[sportmaster]

lcl improved Bee - Ant's circle but Jimmy's looks better because it's clear but I probably can't get collision with that line so it's only visaul effect. The advantage of lcl's is that I can add physicall response with canvas. Thanks to you I know two ways to draw circle but I still don't know how to make a curve line from point to point. I need to know how to display by canvas lines with various curvature for my next game so I'm counting on you

[Bee-Ant]

Something like this???
http://dl.dropbox.com/u/3997355/Curve.ged

Well, basically you just need an array to store all the y point value.
Then connect them using moveto() and lineto()

[sportmaster]

Yeaaach!! Another point for Beeee - Aaant !

[Bee-Ant]

Thanks. Glad I could help