sPointsBrush.cpp

// The implementation of Point Brush. It is a kind of ImpBrush. All your brush implementations
// will look like the file with the different GL primitive calls.
//

#include "impressionistDoc.h"
#include "impressionistUI.h"
#include "sPointsBrush.h"

extern float frand();
extern float ufRandMap(float);

SPointsBrush::SPointsBrush( ImpressionistDoc* pDoc, const char* name ) :
	ImpBrush(pDoc,name)
{
}

void SPointsBrush::BrushBegin( const Point source, const Point target )
{
	ImpressionistDoc* pDoc = GetDocument();
	ImpressionistUI* dlg=pDoc->m_pUI;
	BrushMove( source, target );
}

void SPointsBrush::BrushMove( const Point source, const Point target )
{
	ImpressionistDoc* pDoc = GetDocument();
	ImpressionistUI* dlg=pDoc->m_pUI;

	if ( pDoc == NULL ) {
		printf( "SPointsBrush::BrushMove  document is NULL\n" );
		return;}

	int size = pDoc->getSize();
	const int scatterRad = size/2;
	const int scatterSize = size;
	glPointSize( (float)size/(float)(scatterRad*5));
	std::vector<float> offsetsX(scatterSize,scatterRad);
	std::vector<float> offsetsY(scatterSize,scatterRad);
	std::transform(offsetsX.begin(),offsetsX.end(),offsetsX.begin(),ufRandMap);
	std::transform(offsetsY.begin(),offsetsY.end(),offsetsY.begin(),ufRandMap);
	glBegin( GL_POINTS );
		SetColor( source );
		std::vector<float>::iterator itX = offsetsX.begin();
		std::vector<float>::iterator itY = offsetsY.begin();
		glVertex2d( target.x, target.y);
		for(int i = 0;i<scatterSize;++i){
			glVertex2d( target.x + *itX, target.y + *itY );
			++itX;
			++itY;}
	glEnd();}



void SPointsBrush::BrushEnd( const Point source, const Point target )
{
	// do nothing so far
}