Forums: Flash:

Hello flash peeps,

I'm a dunce when it comes to maths and I have a problem I need help with. I doubt it's especially hard but it's too much for my feeble brain so I'd appreciate any help.

I need to join two points with a line. Easy enough if it's a straight line, but I need the line to have a slight curve. I know how to use curveTo, what I don't know is how to calculate the position of the 'control point' that dictates the shape of the curve.

So here's my (theoretical) code:

start_point = {

x:0,

y:0

};

end_point = {

x:100,

y:100

};

control_point = {

x:???,

y:???

};



line.moveTo(start_point.x, start_point.y);

line.curveTo(control_point.x , control_point.y, end_point.x, end_point.y);	

Are you trying to find curveThru code?
forums.swishzone.com/index.php?s=d8b09993f33ccb9361b069fda0bbae89&showtopic=923

Thanks for the pointers, but in the end I worked it out for myself using the sort of bonehead maths that my brain is capable of understanding (I had a shower, I always seem to think better in the shower).

It goes something like this:

start_point = {
x:0,
y:0
};
end_point = {
x:100,
y:100
};

mid_point_x = ( start_point.x + end_point.x ) / 2;
mid_point_y = ( start_point.y + end_point.y ) / 2;

line_diff_x = end_point.x - start_point.x;
line_diff_y = end_point.y - start_point.y;

control_point = {
x:mid_point_x - ( line_diff_y / 10 ),
y:mid_point_y + ( line_diff_x / 10 )
};

line.moveTo(start_point.x, start_point.y);
line.curveTo(control_point.x , control_point.y, end_point.x, end_point.y);