drawing clouds background* in matlab?

hi everyone, i started using matlab about 3 months ago and am just aware of the basic computing i.e. for loops , while loops, if conditions. i have been given a game as a project. i was thinking of drawing its graphics first. i wanted to draw moving clouds in the background. i do not know any function to draw this nor could i think of any way to somehow create my own function. kindly help me in doing that. regards, khurram

Answer 1

[Jan]

You can draw an image in an axes object:

AxesH = axes('Units', 'normalized', 'Position', [0, 0, 1, 1]);
img   = imread('clouds.jpg');  % <- your file name here
image(img, 'Parent', AxesH);

Now you can crop the wanted rectangle from the loaded image, e.g. by:

moved = img(1:200, 1:300)

[khurram]

exactly....i wanted something like this.

i copied this code into matlab and it worked fine but i cant seem to understand it. i wrote help units,normalized into the command window but could not figure out anything.kindly help me understand the function. i mean tell me a bit what "units" 'normalized' 'position' and 'parent' do in this case.thanks.

[khurram]

also the method u told for cropping was not working. i need that too.

Answer 2

[Image Analyst]

Try this demo. I wrote it using Peter Kovesi's program. Be sure to download his m-file like my instructions say to. This program will generate cloud images one at a time until you say quit.

% Demo to make cloud-like images.
% Uses the noiseonf routine of Peter Kovesi:
  % Copyright (c) 1996-2005 Peter Kovesi
  % School of Computer Science & Software Engineering
  % The University of Western Australia
  % http://www.csse.uwa.edu.au/
% You can download noiseonf.m here:
% http://www.csse.uwa.edu.au/~pk/Research/MatlabFns/Misc/noiseonf.m

clc;
close all;
workspace;
clear;
fontSize = 16;
index = 1;
for h = 0.5:.1:3
  
  %===============================================
  % Create the image.
  % THIS IS THE KEY PART!
  grayImage = noiseonf(800, 1.7);
  %===============================================
  
  % Display it
  imshow(grayImage, []);
  % Enlarge figure to full screen.
  % Need to re-enlarge it every single time for some reason.
  set(gcf, 'Position', get(0,'Screensize')); 
  set(gcf,'name','Clouds Demo','numbertitle','off') 
  
  if index == 1
    promptMessage = sprintf('I will show you images like this one.\nClick Accept when you see an image you like.');
    button = questdlg(promptMessage, 'Instructions', 'Continue.  Try Another', 'Accept this one', 'Quit Program', 'Continue.  Try Another');
    if strcmpi(button, 'Accept this one') > 0
      break;
    elseif strcmpi(button, 'Quit Program') > 0
      close all;
      return;
    end
    index = index + 1;
  else
    promptMessage = sprintf('This is h = %.1f', h);
    title(promptMessage, 'FontSize', fontSize);
    button = questdlg(promptMessage, 'Instructions', 'Continue.  Try Another', 'Accept', 'Quit Program', 'Continue.  Try Another');
    if strcmpi(button, 'Accept') > 0
      break;
    elseif strcmpi(button, 'Quit Program') > 0
      return;
    end
  end
end
% Convert to a uint8 (8 bit gray scale) image.
% grayImage = uint8(255 * mat2gray(grayImage));
uiwait(msgbox('Done with demo!'));

[khurram]

the code works fine but i wanted something that i could understand. this is too difficult. also i wanted a bit animated picture. thanks anyway. i got another way.