The Digital Differential Analyzer (DDA) algorithm is a fundamental technique in computer graphics used to draw straight lines between two points on a raster display. It calculates intermediate points along the line and plots them as pixels, ensuring a smooth and continuous representation of the line.

Key Steps in the DDA Algorithm

1. Input the starting point (x1, y1) and the ending point (x2, y2) of the line.

2. Calculate the differences dx = x2 - x1 and dy = y2 - y1.

3. Determine the number of steps required to draw the line as steps = max(|dx|, |dy|).

4. Compute the increments for each step: Xinc = dx / steps Yinc = dy / steps

5. Initialize the starting point (X, Y) as (x1, y1).

6. Loop through the number of steps, plotting the pixel at (round(X), round(Y)) and updating X and Y by adding Xinc and Yinc respectively.

Example Implementation in Python

Below is a Python implementation of the DDA algorithm: