Exercises

Exercise: Compilation Target

Create a line drawing of an archery target with three concentric scoring bands, as shown below.

Simple archery target

For bonus credit add a stand so we can place the target on a range, as below.

Archery target with a stand

The simplest solution is to create three concentric circles using the on method:

Image
  .circle(40)
  .on(Image.circle(80))
  .on(Image.circle(120))

For the extra credit we can create a stand using two rectangles:

Image
  .circle(40)
  .on(Image.circle(80))
  .on(Image.circle(120))
  .above(Image.rectangle(12, 40))
  .above(Image.rectangle(40, 12))

Exercise: Stay on Target

Colour your target red and white, the stand in brown (if applicable), and some ground in green. The example below shows what we are aiming for.

Colour archery target

The trick here is using parentheses to control the order of composition. The fillColor(), strokeColor(), and strokeWidth() methods apply to a single image, so we need to make sure that image comprises the correct set of shapes.

Image
  .circle(40)
  .fillColor(Color.red)
  .on(Image.circle(80).fillColor(Color.white))
  .on(Image.circle(120).fillColor(Color.red))
  .above(Image.rectangle(12, 40).fillColor(Color.brown))
  .above(Image.rectangle(40, 12).fillColor(Color.brown))
  .above(Image.rectangle(160, 50).noStroke.fillColor(Color.green))

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