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// shape.cpp
// Implementation of classes Shape and Polyline.
#include "shape.h"
// class Shape
// all methods inline
// class Polyline
Polyline::Polyline( Point arr[], int n )
{
arrPoints = NULL;
nLines = 0;
if( n > 0 ) {
anchor = arr[ 0 ]; // anchor
if( n > 1 ) {
nLines = n - 1;
// save points relatively to anchor
arrPoints = new Point[ nLines ];
for( int i = 0; i < n-1; ++i )
arrPoints[ i ] = arr[ i + 1 ] - anchor;
}
}
}
Polyline::Polyline( const Polyline& src ) // copy constructor
{
nLines = src.nLines;
anchor = src.anchor;
arrPoints = NULL;
if( src.nLines > 0 ) {
arrPoints = new Point[ nLines ];
for( int i = 0; i < nLines; ++i )
arrPoints[ i ] = src.arrPoints[ i ];
}
}
Polyline& Polyline::operator=( const Polyline& src ) // assignment
{
if( this != &src ) {
delete [] arrPoints;
nLines = src.nLines;
anchor = src.anchor;
arrPoints = NULL;
if( src.nLines > 0 ) {
arrPoints = new Point[ nLines ];
for( int i = 0; i < nLines; ++i )
arrPoints[ i ] = src.arrPoints[ i ];
}
}
return *this;
}
double Polyline::getLength() const
{
double len = 0.0;
if( nLines > 0 ) {
Point begin( 0, 0 );
for( int i = 0; i < nLines; ++i ) {
len += begin.distance( arrPoints[ i ] );
begin = arrPoints[ i ];
}
}
return len;
}
// append one more point:
Polyline& Polyline::operator+=( const Point& p )
{
Point* ptr = new Point[ nLines + 1 ]; // new array
for( int i = 0 ; i < nLines; ++i ) // copy points into new array
ptr[ i ] = arrPoints[ i ];
ptr[ nLines ] = p - anchor; // add new point
++nLines;
delete [] arrPoints; // free old array
arrPoints = ptr;
return *this;
}
// append a second line:
Polyline& Polyline::operator+=( const Polyline& src )
{
if( src.nLines > 0 ) {
Point last = Point( 0, 0 ); // rel. coordinates of last point
if( nLines > 0 )
last = arrPoints[ nLines - 1 ];
Point* ptr = new Point[ nLines + src.nLines ]; // new array
int i;
for( i = 0; i < nLines; ++i ) // copy points into new array
ptr[ i ] = arrPoints[ i ];
for( i = 0; i < src.nLines; ++i ) // append points of src
ptr[ nLines + i ] = last + src.arrPoints[ i ];
nLines += src.nLines;
delete [] arrPoints; // free old array
arrPoints = ptr;
}
return *this;
}
void Polyline::scale( double scalingFactor )
{
for( int i = 0; i < nLines; ++i )
arrPoints[ i ] *= scalingFactor;
}
string Polyline::toString() const // points of line
{
string str = anchor.toString();
for( int i = 0; i < nLines; ++i )
str += " ", str += ( anchor + arrPoints[ i ] ).toString();
return str;
}
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