the coordinates of the satellite position are vector . If I get you right you need to expend the length of the vector That is to increase its magnitude . Just multiply vector components by a scalar factor and then redraw your line to the new vector points . Hope it helps
On Tue, Jun 1, 2010 at 2:23 PM, Josh <[email protected]> wrote: > Hi folks, > > I'm looking to draw a line from a point on a sphere to a point in > orbit, I've given it my best shot but I'm coming up a little short, > any help would be amazing. > > So I have some geolocated points on a sphere, which I'm placing using > this code... > > var phi:Number = (90-lat_)*Math.PI/180; > var theta:Number = (lon_ +180) * Math.PI / 180; > > var xp:int = (sphereRadius) * Math.sin(phi) * Math.cos(theta); > var zp:int = (sphereRadius) * Math.sin(phi) * Math.sin(theta); > var yp:int = (sphereRadius) * Math.cos(phi); > > Above each of these points I'm adding a satellite billboard > > msc_= new MovieClipSprite(satellite_mc, { scaling:1, ownCanvas:true, > smooth:true, deltaZ:0, rescale:true } ); > msc_.x = (sphereRadius+ 200) * Math.sin(phi) * Math.cos(theta); > msc_.z = (sphereRadius+ 200) * Math.sin(phi) * Math.sin(theta); > msc_.y = (sphereRadius+ 200) * Math.cos(phi); > > I am then connecting the surface point on the sphere to it's satellite > in orbit using a linesegement... > > var mat:WireframeMaterial = new WireframeMaterial( 0x56BEEC, {width:1, > height:1, thickness:2}); > line_ = new LineSegment( { material:mat } ); > line_.start = new Vertex(xp, yp, zp); > line_.end = new Vertex(msc_.x, msc_.y, msc_.z); > addChild(line_); > > This all works perfectly, however I want to offset the position of the > satellite, something like this... > > msc_.screenXOffset = 100; > > But I can't figure out how to draw my line taking into account the > offset of my satellite so that they still connect, if awayone has an > idea how I could do this I'd really appreciate your help. -- Michael Ivanov ,Programmer Neurotech Solutions Ltd. Flex|Air |3D|Unity| www.neurotechresearch.com http://blog.alladvanced.net http://www.meetup.com/GO3D-Games-Opensource-3D/ Tel:054-4962254 [email protected] [email protected]
