I need help with a checker board pattern

2016 11 21
1 个回答
更新时间：2016 11 21
8 次查看（30 天）

0 个投票

I have a code that lets the user input the size of the squares, the dimension of the pattern, and the two colors. The problem I am having is that I can not figure out how to properly have each square alternate between the colors and how to properly have all the squares in the dimension.
This is the code for the plot of the checkerboard pattern that I have so far:
N=4;
S=0;
theta=zeros(1,N);
for k=1:N
theta(k)=2*pi*(k-1)/N;
end
for m=1:D
x1=(R*cos(theta+pi/4)/sqrt(2))+S;
y1=(R*sin(theta+pi/4)/sqrt(2))+S;
plot(x1,y1);
fill(x1,y1,C1);
hold;
x2=(R*cos(theta+pi/4)/sqrt(2))+S;
y2=(R*sin(theta+pi/4)/sqrt(2));
plot(x2,y2);
fill(x2,y2,C2);
hold;
x3=(R*cos(theta+pi/4)/sqrt(2));
y3=(R*sin(theta+pi/4)/sqrt(2))+S;
plot(x3,y3);
fill(x3,y3,C2);
hold;
S=S+R;
end
R is the Size of the square
D is the Dimension Size
C1 and C2 are the colors
How would I go about fixing this code to make sure that I can satisfy all requirements?

2 个评论
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John D'Errico
John D'Errico 2016-11-21
Why are you working in polar coordinates to create a checkerboard?
Rafael Perales
Rafael Perales 2016-11-21
Because one of the requirements is to inscribe the square into a circle than to rotate by a phase to make a pattern out of those squares

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回答（1 个）

Image Analyst
Image Analyst 2016-11-21

0 个投票

Why not use the checkerboard() function?

5 个评论
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Rafael Perales
Rafael Perales 2016-11-21
I am using colors like red and green not just black and white
Image Analyst
Image Analyst 2016-11-21
So? You can use ind2rgb() to make certain gray levels into certain colors.
Rafael Perales
Rafael Perales 2016-11-21
But doesn't the checkerboard function just create and image not a plot on a graph?
Image Analyst
Image Analyst 2016-11-21
checkerboard() creates an image. In my mind, and I think most people's minds, when we think of a checkerboard we think of an image, like if you were looking at a chessboard or checkerboard. Not sure what you mean by a plot. Can you show us what a plot might look like?
Rafael Perales
Rafael Perales 2016-11-21
Ok here is basically what I'm trying to do. Basically this is 2x2 version of what I'm trying to do.
The code I used for this is:
N=4;
R=2;
theta=zeros(1,N);
for k=1:N
theta(k)=2*pi*(k-1)/N;
end
x1=(R*cos(theta+pi/4)/sqrt(2))+R;
y1=(R*sin(theta+pi/4)/sqrt(2))+R;
plot(x1,y1);
fill(x1,y1,'y');
x2=(R*cos(theta+pi/4)/sqrt(2))+R;
y2=(R*sin(theta+pi/4)/sqrt(2));
plot(x2,y2);
fill(x2,y2,'b');
x3=(R*cos(theta+pi/4)/sqrt(2));
y3=(R*sin(theta+pi/4)/sqrt(2))+R;
plot(x3,y3);
fill(x3,y3,'b');
x4=(R*cos(theta+pi/4)/sqrt(2));
y4=(R*sin(theta+pi/4)/sqrt(2));
plot(x4,y4);
fill(x4,y4,'y');

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