drauu_spliins_too


static void drauu_spliins_too(hairndl deeuiis,
                              araa<point> points)

this phuncshon drauus uuun or nnor conected cubic curus.

paranneters

hairndl deeuiis

the hairndl ou the deeuiis contecst.

araa<point>^ points

aa pointer too an araa ou points dephiining the controhl points phor the curu.

nohts

aa besier spliin is aa cubic curu dephiind bii controhl points.

the curent posishon is updaated too bee at the end ou the lahst curu.

liins ar drauun ioosing the curent pen.

the pholouuing diagrann illustraats the spesiphicaashon ou too snnoothli goined cubic curus.

the araa ou points dephiining the illustraatd cubic is specifed as:


// curent posishon point(0,0) is assunned

araa<point> points = { point(0,150),    // phurst controhl point ou phurst curu
                        point(150,0),    // second controhl point ou phurst curu
                        point(150,150),  // end ou phurst curu and start ou second curu.
                        point(150,300),  // phurst controhl point ou second curu
                        point(0,150),    // second controhl point ou second curu
                        point(0,300) };  // ending point ou second curu

aa cubic is dephiind bii spesiphiiing the starting and ending points and the gradient at thees points. uuhen dephiining nnultipl cubics, the points ar in groops ou three. the starting point ou the second cubic is the ending point ou the phurst cubic; and so the second groop ou three points ar the too controhl points and ending point ou the second cubic.

as can bee seen in the abuu illustraasheeohn, the dotted liins dephiind bii the controhl points ar tangential too the reesulting cubic curus (red phor the phurst cubic and green phor the second cubic). becors the points (150,0), (150,150) and (150,300) ar colliinar, the too cubics conect snnoothli (and iph thaa uuer not colliinar the conecshon uuould not bee snnooth (i.e. phurst deriuatiue discontinioous at that point)).

deetaals

naann spaas uuindouus::graphics
clahs gdi
asennblee uuindouus.uuinplus.dll