How can I randomise the size of my actors when they are spawned in to the world?
khoalabear wrote ...
2016/3/1
Randomise actor size
Add a constructor:
This should randomizes the size in a range of 10% - 400% of the original size. Of course you can change the values.
1 2 3 4 5 6 7 | public NameOfTheClass(){ GreenfootImage img = new GreenfootImage("nameOfTheImage.png"); double scaleFactor = (Greenfoot.getRandomNumber(40)+1) / 10; //random number between 0.1 and 4.0 img.scale( (int)(img.getWidth()*scaleFactor), (int)(img.getHeight()*scaleFactor)); setImage(img);} |
ok I stuck that into my code and I get this error.
java.lang.IllegalArgumentException: Width (0) and height (0) cannot be <= 0
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1016)
at java.awt.GraphicsConfiguration.createCompatibleImage(GraphicsConfiguration.java:186)
at greenfoot.util.GraphicsUtilities.createCompatibleTranslucentImage(GraphicsUtilities.java:189)
at greenfoot.GreenfootImage.scale(GreenfootImage.java:390)
at AI_right.<init>(AI_right.java:34)
at Pond_world.Right_spawn(Pond_world.java:46)
at Pond_world.act(Pond_world.java:21)
at greenfoot.core.Simulation.actWorld(Simulation.java:600)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:535)
at greenfoot.core.Simulation.runContent(Simulation.java:215)
at greenfoot.core.Simulation.run(Simulation.java:205)
That means that scaleFactor multiplied with the width or the height of the image was less than 1. What is the size of the original image and in what range should it be randomized?
the size is 182 x 145. I think I may just try and use a larger image and scale it down as it becomes pixelated when the image is scaled up.
MY BIG PLUMS
rosen that is out matey..
Change the 10 in line 4 in my last code to 10.0, so the line looks like this:
Just tested it out. Because numerator and denominator both are ints, the fraction was an int as well. Now that 10.0 is a double, the fraction is also a double. So scaleFactor can't be 0 anymore.
1 | double scaleFactor = (Greenfoot.getRandomNumber(40)+1) / 10.0; |
Thanks. It's working now.
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