Draw Indian flag using Matlab

Approach to drawing the Indian flag

• First, we need to create a 300X600X3 matrix and fill it with white. 300 — the number of lines, and 600 — number of columns. Color image requires 3 channels, so 3 represents the RGB (red, green, blue) channel.

   img = uint8 (zeros (300, 600, 3)) 

• Divide the matrix by three pieces (0-100) rows for saffron color, (101-200) rows for white and Ashoka chakra, (201-300) rows for green.
• Fill in the matrix with saffron color (255, 153 , 51) from the 1st row to the 100th row.

   img (1: 100, 1: 600, 1) = 255; img (1: 100, 1: 600, 2) = 153; img (1: 100; 1: 600, 3) = 51; 

• Fill the matrix with green (19, 136, 8) from line 201 to 300.

   img (201: 300, 1: 600, 1) = 19; img (201: 300, 1: 600, 2) = 136; img (201: 300, 1: 600, 3) = 8; 



• To make the Ashoka chakra, first we need to understand the equation of distance between two given coordinates.

   (distance)  2  = (x2-x1)  2  + (y2-y1)  2  

  (x1, y1) and (x2, y2) — two given coordinates.

• Using the above equation, we can make a circle of the ashok chakra. The coordinates of the center of the matrix and the circle (150, 300). To draw a circle, the inner radius is 40 and the outer radius is 45.

for i = 1 : 300 for j = 1 : 600 if ( sqrt (power ( 150 - i, 2 ) + power ( 150 - j , 2 ))" = 40 & amp; & amp;  sqrt (power ( 150 - i, 2 ) + power ( 150 - j, 2 )) " = 45 ) img (i, j, 1 ) = 0 ;  img (i, j, 2 ) = 0 ;  img (i, j, 3 ) = 128 ;  end end   end



• The angle between two adjacent spokes of the ashoka chakra is (360 / n) = 15 ^o , where n (number of spokes) = 24. atand — this is a MATLAB function used to determine the angle.

for i = 110 : 190 for j = 260 : 340 dist = ( sqrt (power (i - 150 , 2 ) + power (j - 300 , 2 )));  k = round (atand (( 300 - j) / ( 150 - i)));  if dist " = 40 & amp; & amp; mod (k, 15 ) = = 0 img (i, j, 1 : 2 ) = 0 ;  end end end

The implementation is shown below:

Output: