CODEWITHSUNDEEP
c#loopsrandomshapesdynamically-generated
bobo22
bobo22

Reputation: 25

How to randomly select a shape to draw several using a loop?

I got stuck when i want to display my objects in a random way . Let's say i got this pannel and let's say the rectangle and ellipse are the objects

Example

What do i need to do so i can have them display in this form.

Do i need to use Random n = new Random ? or there is another way.

This is one of my attemps but i dont know how to integrate the random function to display them.

do
{
    dr.DrawEllipse(Bpen, i + 30, 25, i + 30, 25);
    i += 50;
} 
while (i <= this.Width);

Upvotes: 2

Views: 330

Answers (1)

user12031933
user12031933

Reputation:

You can use an array of available items like { squareType, circleType }.

And then random 0..Length on that array to select and draw the relevant shape.

For example you can use this enum:

public enum Shapes
{
  Circle,
  Square
}

And declare these members:

static readonly Array ShapesValues = Enum.GetValues(typeof(Shapes));
static readonly int ShapesCount = ShapesValues.Length;

And this RNG:

static readonly Random random = new Random();

So you can write:

int posX = 0;
do
{
  switch ( ShapesValues.GetValue(random.Next(ShapesCount)) )
  {
    case Shapes.Circle:
      // ...
      break;
    case Shapes.Square:
      // ...
      break;
    default:
      throw new NotImplementedException();
  }
  posX += 50;
}
while ( posX <= Width );

By doing this, you can define and manage any necessary shape in a clean and maintainable way.

If the shapes can have different sizes, consider handling this with intermediate variables.

You could also write this to make the code more secure:

static readonly ReadOnlyCollection<Shapes> ShapesValues 
  = Array.AsReadOnly(Enum.GetValues(typeof(Shapes)).Cast<Shapes>().ToArray());

static readonly int ShapesCount = ShapesValues.Count;

And:

switch ( ShapesValues[random.Next(ShapesCount)] )

Upvotes: 2

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