Line rasterisation: Cover all pixels, regardless of line gradient?

Question

Basically, I want to use a line algo to determine which cells to check for collisions for my raycaster.

Bresenham isn\'t great for this as it uses a unified-thicknes

Answer 1

This thread old, but I thought it'd be worth putting this on the Internet:

// This prints the pixels from (x, y), increasing by dx and dy.
// Based on the DDA algorithm (uses floating point calculations).
void pixelsAfter(int x, int y, int dx, int dy)
{
    // Do not count pixels |dx|==|dy| diagonals twice:
    int steps = Math.abs(dx) == Math.abs(dy)
            ? Math.abs(dx) : Math.abs(dx) + Math.abs(dy);
    double xPos = x;
    double yPos = y;
    double incX = (dx + 0.0d) / steps;
    double incY = (dy + 0.0d) / steps;
    System.out.println(String.format("The pixels after (%d,%d) are:", x, y));
    for(int k = 0; k < steps; k++)
    {
        xPos += incX;
        yPos += incY;
        System.out.println(String.format("A pixel (%d) after is (%d, %d)",
            k + 1, (int)Math.floor(xPos), (int)Math.floor(yPos)));
    }
}