(animate-with proc) -> void?
  proc: procedure?, a procedure that takes the current time in milliseconds as input.

Repeatedly calls proc approximately once every 60 seconds, creating the effect of animation.

(canvas-onclick canvas proc) -> void?
  canvas: canvas?
  proc: procedure?, a procedure that takes two arguments: numbers representing the x and y coordinate of the mouse click on the canvas.

Sets the given procedure to be called when the canvas is clicked by the user.

(draw-circle canvas x y radius mode color) -> void?
  canvas: canvas?
  x: number?
  y: number?
  radius: number?, non-negative
  mode: string?, either `"solid"` or `"outline"`
  color: string?

Renders a circle whose center is at (x, y) and radius radius.

(draw-drawing canvas drawing x y) -> void?
  canvas: canvas?
  drawing: drawing?
  x: integer?
  y: integer?

Draws the given drawing (created via the image library) at the given coordinates.

(draw-ellipse canvas x y radiusX radiusY rotation startAngle endAngle mode color) -> void?
  canvas: canvas?
  x: number?
  y: number?
  radiusX: number?, non-negative
  radiusY: number?, non-negative
  rotation: number?
  startAngle: number?
  endAngle: number?
  mode: string?, either `"solid"` or `"outline"`
  color: string?

Renders an ellipse whose center is at (x, y), radii radiusX and radiusY, rotation, startAngle, and endAngle.

(draw-path canvas pairs mode color) -> void?
  canvas: canvas?
  pairs: list?, a list of pairs of numbers
  mode: string?, either `"solid"` or `"outline"`
  color: string?

Renders a path from the given list of pairs of numbers.

(draw-rectangle canvas x y width height mode color) -> void?
  canvas: canvas?
  x: integer?
  y: integer?
  width: integer?, non-negative
  height: integer?, non-negative
  mode: string?, either `"solid"` or `"outline"`
  color: string?

Renders a rectangle whose upper-left corner is at (x, y).

(draw-text canvas text x y mode color font) -> void?
  canvas: canvas?
  text: string?
  x: integer?
  y: integer?
  mode: string?, either `"solid"` or `"outline"`
  color: string?
  font: string?, a css font string, e.g., `"24px sans-serif"`

Renders the given text at the given coordinates.

(make-canvas width height) -> canvas?
  width: integer?, positive
  height: integer?, positive

Creates a canvas with the given width and height.