Thread: Ask about SetPixel, Lineto and Moveto

I write these below program to draw a rectangle which have black frame. In the rectangle have 4 red points and I draw the line between 2 point. So I get the result as this picture http://www.geocities.com/ooosawaddee...intPicture.jpg

In the picture the red point is very small and the line between point is not exactly straight. I want the larger red point and straight line. Do you know how to do that?

Code:

	pDC->SetMapMode(MM_TEXT);

	// Paint white color as the background 
	pDC->FillSolidRect(origin.x, origin.y, 2000, 2000, RGB(255,255,255));
	
	int cx = 5;
	int cy = 5;	
	
	CPen pen, pen2;
	pen.CreatePen(PS_SOLID,2, RGB(0,0,0));

	pDC->SelectObject(&pen);

	pDC->Rectangle(cx,cy,(cx +256), (cy + 192));
	pDC->SetPixel(45,10, RGB(255,0,0));
	pDC->SetPixel(47,9, RGB(255,0,0));
	pDC->SetPixel(79,45, RGB(255,0,0));
	pDC->SetPixel(46,120, RGB(255,0,0));

	pen2.CreatePen(PS_SOLID,1, RGB(0,0,255));

	pDC->SelectObject(&pen2);
	pDC->MoveTo(45,10);
	pDC->LineTo(79,45);

You can try drawing some rects and filling them for larger "points". Or you can make your on function which will draw diamonds or what not. A pixel is a pixel, its pretty small. Also you can get rid of the aliasing with bi-linear filtering if you'd like but that's probably not within the scope of your project. However if you are interested you can find a lot of algorithms online.