Tô màu cho từng điểm của Rectangle

[nttt]

Có ai biết cách nào để tô màu từng pixel trong Rectangle không? Giúp mình với.

[huyfeng]

//Ham hoan vi

void Hoan_vi(int &a,int &b)
{
	int Temp;
	Temp=a;
	a=b;
        b=Temp;
}

//Ham hoan vi 2 diem

void Hoan_vi_2_diem(int &X1,int &Y1,int &X2,int &Y2)
{
	Hoan_vi(X1,X2);
	Hoan_vi(Y1,Y2);
}

//Ham lam tron

int Round (float x)
{
	return (int)(x+0.5);
}

/*------------------ Thuat toan DDA ----------------------*/
// Truong hop 1 & 3: X1<X2

void DrawLine1 (int X1,int Y1,int X2,int Y2,int color)
{
	float m,y;
	int x;
	m = (float)(Y2-Y1)/(X2-X1);
	x = X1;
	y = Y1;
	putpixel (x,y,color);
	while ( x < X2 )
	{
		x++;
		y += m;
		putpixel(x,Round(y),color);
	}
}

// Truong hop 2 & 4: Y1<Y2

void DrawLine2 (int X1,int Y1,int X2,int Y2,int color)
{
	float k,x;
	int y;
	k = (float)(X2-X1)/(Y2-Y1);
	x = X1;
	y = Y1;
	putpixel (x,y,color);
	while ( y < Y2 )
	{
		y++;
		x += k;
		putpixel(Round(x),y,color);
	}
}

void DrawLine (int X1,int Y1,int X2,int Y2,int color)
{
	if(X1 == X2 && Y1 == Y2)
	{
		putpixel(X1,Y1,color);
		return;
	}
	if( abs(X2-X1) >= abs(Y2-Y1) )
	{
		if ( X1>X2 )
			Hoan_vi_2_diem(X1,Y1,X2,Y2);
		DrawLine1(X1,Y1,X2,Y2,color);
	}
	else
	{
		if ( Y1>Y2 )
			Hoan_vi_2_diem(X1,Y1,X2,Y2);
		DrawLine2(X1,Y1,X2,Y2,color);
	}
}

/*----------------------------------------------------------------*/

void Sap_xep_1(int &Left,int &Top,int &Right,int &Bottom)
{
	if(Top<Bottom)
		Hoan_vi(Top,Bottom);
	if(Left>Right)
		Hoan_vi(Left,Right);
}

/*-------------- TO HINH CHU NHAT ---------------------------*/

void FillRectangle (int Left,int Top,int Right,int Bottom,int fColor)
{
	int y;
	Sap_xep_1(Left,Top,Right,Bottom);
	for(y=Bottom;y<=Top;y++)
	{
		DrawLine(Left,y,Right,y,fColor);
		delay (DELAY);
	}
}