2-11. ランダムをつかいこなす

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func design( screen:PGScreen ) {
   for _ in 0 ..< 100 {
       let a = (0.0...3.0).randomize
       if a < 1.0 {
           PGCircle()
           .color( .random )
           .scale( square:(20...100).randomize )
           .position( screen.randomPoint )
           .angle( .random )
           .alpha( .random )
       }
       else if a < 2.0 {
           PGTriangle()
           .color( .random )
           .scale( square:(20...100).randomize )
           .position( screen.randomPoint )
           .angle( .random )
           .alpha( .random )
       }
       else {
           PGRectangle()
           .color( .random )
           .scale( square:(20...100).randomize )
           .position( screen.randomPoint )   
           .angle( .random )
           .alpha( .random )
       }
   }
}