We have been given the start points and endpoints of a line.
X0 = 0
Y0 = 0
The first step in Bresenham's Line Drawing Algorithm is to find the value of ΔX and ΔY.
ΔX = 5
ΔY = 5
The initial decision parameter is given by 2ΔY - ΔX = 10 - 5 = 5.
Since the decision parameter is positive, the next value of X and Y is calculated as
X = X+1 = 0+1 = 1
Y = Y+1 = 0+1 = 1
P = P+(2ΔY - ΔX) = 5+5 = 10
Again since the decision parameter is positive, X and Y are calculated as:
X = X+1 = 1+1 = 2
Y = Y+1 = 1+1 = 2
P = P+(2ΔY - ΔX) = 10+5 = 15
Again since the decision parameter is positive, X and Y are calculated as:
X = X+1 = 2+1 = 3
Y = Y+1 = 2+1 = 3
P = P+(2ΔY - ΔX) = 15+5 = 20
Again since the decision parameter is positive, X and Y are calculated as:
X = X+1 = 3+1 = 4
Y = Y+1 = 3+1 = 4
P = P+(2ΔY - ΔX) = 20+5 = 25
Again since the decision parameter is positive, X and Y are calculated as:
X = X+1 = 4+1 = 5
Y = Y+1 = 4+1 = 5
P = P+(2ΔY - ΔX) = 25+5 = 30
Since this is the end point, we terminate our algorithm here. Let us draw the line we have rasterized.
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