## What are the steps of scanline fill algorithm?

Table of Contents

1) intersect scanline y with each edge 2) sort interesections by increasing x [p0,p1,p2,p3] 3) fill pairwise (p0 −> p1, p2−> p3..) Rule: If the intersection is the ymin of the edge’s endpoint, count it.

## What is flood fill technique?

Flood fill is an algorithm mainly used to determine a bounded area connected to a given node in a multi-dimensional array. It is a close resemblance to the bucket tool in paint programs. The most approached implementation of the algorithm is a stack-based recursive function, and that’s what we’re gonna talk about next.

**What is difference between boundary fill and flood fill?**

In Flood-fill algorithm a random colour can be used to paint the interior portion then the old one is replaced with a new one. In Boundary-fill algorithm Interior points are painted by continuously searching for the boundary colour. It requires huge amount of memory.

**Is flood fill algorithm?**

Flood fill also called as seed fill is an algorithm to determine the area connected to the given node in a multi-dimensional array. The most common use of this is to use it as a bucket to fill connected, same colored areas in the painting apps Or in the images to replace the pixels with same color.

### What is scanline fill?

Scanline filling is basically filling up of polygons using horizontal lines or scanlines. The purpose of the SLPF algorithm is to fill (color) the interior pixels of a polygon given only the vertices of the figure.

### What are the basic steps performed to fill a polygon explain the algorithm with the given scenario?

Step 1 − Initialize the value of seed point seedx,seedy, fcolor and dcol. Step 2 − Define the boundary values of the polygon. Step 3 − Check if the current seed point is of default color, then repeat the steps 4 and 5 till the boundary pixels reached.

**What are the three flood fill techniques you can use in your sketch?**

The traditional flood-fill algorithm takes three parameters: a start node, a target color, and a replacement color.

**What is 4 connected and 8 connected method?**

4-connected region: from a given pixel you can get to any other pixel in the region by a series of 4 way moves (up, down,left, right). 8-connected region: from a given pixel you can get to any other pixel in the region by a series of 8 way moves (up, down,left, right, up-left, up-right, down-left, down-right).

## What are the drawbacks of boundary filling color method?

The limitations of boundary fill algorithm like if the polygon is having boundaries with different colors then boundary fill algorithm fails. This limitation of boundary fill algorithm is overcome in flood fill algorithm. The flood fill algorithm is also called as seed fill algorithm.

## In which situation flood fill is better than boundary fill area filling algorithm?

The crucial differing point in these algorithms is that the flood-fill first checks whether a random pixel is having the region’s original colour or not….Comparison Chart.

Basis for comparison | Flood-fill Algorithm | Boundary-fill algorithm |
---|---|---|

Memory consumption | High | Low |

Speed | Comparatively slower | Fast |

**Which parameters are accepted by flood fill algorithm?**

The Algorithm Parameters The traditional flood-fill algorithm takes three parameters: a start node, a target color, and a replacement color. The algorithm looks for all nodes in the array that are connected to the start node by a path of the target color and changes them to the replacement color.