ImpBrush.cpp

//
// ImpBrush.cpp
//
// The implementation of virtual brush. All the other brushes inherit from it.
//

#include "impressionistDoc.h"
#include "impressionistUI.h"
#include "ImpBrush.h"

// Static class member initializations
int			ImpBrush::c_nBrushCount	= 0;
ImpBrush**	ImpBrush::c_pBrushes	= NULL;

ImpBrush::ImpBrush(ImpressionistDoc*	pDoc, 
				   char*				name) :
					m_pDoc(pDoc), 
					m_pBrushName(name)
{
}

//---------------------------------------------------
// Return m_pDoc, which connects the UI and brushes
//---------------------------------------------------
ImpressionistDoc* ImpBrush::GetDocument(void)
{
	return m_pDoc;
}

//---------------------------------------------------
// Return the name of the current brush
//---------------------------------------------------
char* ImpBrush::BrushName(void)
{
	return m_pBrushName;
}

//----------------------------------------------------
// Set the color to paint with to the color at source,
// which is the coord at the original window to sample 
// the color from
//----------------------------------------------------
void ImpBrush::SetColor (const Point source)
{
	ImpressionistDoc* pDoc = GetDocument();

	glDisable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	
	GLubyte color[4];
	float color2[4];

	memcpy ( color, pDoc->GetOriginalPixel( source ), 3 );

	for (int i = 0; i < 3; i++) {
		color2[i] = color[i] / 256.0;
	}

	color2[3] = pDoc->getAlpha();
 
	glColor4fv( color2 );

}