# What is Scanline polygon fill algorithm explain with the help of an example?

What is Scanline polygon fill algorithm explain with the help of an example? Scanline Polygon filling Algorithm Scanline filling is basically filling up of polygons using horizontal lines or scanlines. The purpose of the SLPF

## What is Scanline polygon fill algorithm explain with the help of an example?

Scanline Polygon filling Algorithm 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 steps of scanline fill algorithm with example?

Polygon Filling Algorithm

• Step 1 − Find out the Ymin and Ymax from the given polygon.
• Step 2 − ScanLine intersects with each edge of the polygon from Ymin to Ymax.
• Step 3 − Sort the intersection point in the increasing order of X coordinate i.e. p0,p1, p1,p2, and p2,p3.

#### Which algorithm is used to fill boundary of polygon?

Boundary fill is the algorithm used frequently in computer graphics to fill a desired color inside a closed polygon having the same boundary color for all of its sides.

Which algorithm is used for large polygons?

The painter’s algorithm (also depth-sort algorithm and priority fill) is an algorithm for visible surface determination in 3D computer graphics that works on a polygon-by-polygon basis rather than a pixel-by-pixel, row by row, or area by area basis of other Hidden Surface Removal algorithms.

What is Z buffer algorithm?

The z-Buffer algorithm is one of the most commonly used routines. It is simple, easy to implement, and is often found in hardware. The idea behind it is uncomplicated: Assign a z-value to each polygon and then display the one (pixel by pixel) that has the smallest value.

## What is edge fill algorithm?

The edge flag algorithm — A fill method for raster scan displays. Contour (polygon) filling is a primitive required in many application areas of raster scan graphics. The bit-map memory in a frame-store display is computationally well suited to this task, as it provides a large scratch pad working space.

### What is line clipping algorithm?

In computer graphics, line clipping is the process of removing lines or portions of lines outside an area of interest. There are two common algorithms for line clipping: Cohen–Sutherland and Liang–Barsky. A line-clipping method consists of various parts.

#### How many types of polygon filling are?

Three types of polygon are recognized, figure (1): convex, concave, and complex.

What are the 4 steps of Warnock’s algorithm?

Fig.3.5. Warnock algorithm

• Initialize the region.
• Generate list of polygons by sorting them with their z values.
• Remove polygons which are outside the area.
• Identify relationship of each polygon.
• Execute visibility decision analysis:
• If none of above is correct then subdivide the area and Go to Step 2.

What is the drawback of z-buffer algorithm?

Storage requirement higher. Since depth storing s not done, a location in the z-buffer may have to be changed many times depending on the number of surfaces representing the scene. It is a time-consuming process as it needs to scan convert every polygon. The space involved is very large.

## Is basic approach used to fill the polygon?

There are two basic approaches used to fill the polygon. One way to fill polygon is to start from given “seed”, point known to be inside the polygon and highlight outward from this point i.e. neigh-bouring pixels until we encounter the boundary pixels.

### Which one is not a type of basic fill style?

2. Which one is not a type of basic fill styles? Explanation: Dark fill is not a type of basic fill style, rest of them is the basic fill styles. Explanation: Rectangular fill pattern is called tiling or tiling pattern.

#### How to explain scan line polygon filling algorithm?

Explain Scan Line Polygon filling algorithm. Recursive algorithms for seed fill methods have got two difficulties:- The first difficulty is that if some inside pixels are already displayed in fill colour then recursive branch terminates leaving further internal pixels unfilled.

How is the scanline filling algorithm used in Photoshop?

This article discusses how to use Scanline filling algorithm to fill colors in an image. 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 is the purpose of scanline filling in OpenGL?

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.

## When to use only one point in polygon filling?

If both lines intersecting at the vertex are on the same side of the scanline, consider it as two points. If lines intersecting at the vertex are at opposite sides of the scanline, consider it as only one point. Components of Polygon fill: Edge Buckets: It contains an edge’s information.