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Gaming Reference
drawStage(color)
- draws a stage on the canvas with the given color. The stage border can be used for collision detection with game objects to keep them within the canvas.canvasBounds
- returns the bounds of the canvas within an object that hasx
,y
,width
, andheight
data values.Picture { turtle drawing }
- creates a picture out of a turtle shape.- The turtle shape can be made by using the turtle primitives.
Picture.image(fileName)
- creates a picture from an image file.pic.draw()
- draws the given picture on the canvas. Just creating a picture does not draw it. The creation via a function and the drawing via a command are separate operations.pic.translate(x, y)
- moves the picture namedpic
on the canvas by the given amount.pic.rotate(angle)
- rotates the picture around its origin by the given angle.pic.rotateAboutPoint(x, y, angle)
- rotates the picture by the given angle around the given (x, y) in the local coordinate system of the picture.pic.setPosition(x, y)
- sets the position of the picture namedpic
to be the given (x, y) on the canvas.pic.collidesWith(otherPic)
- checks to see ifpic
is in collision withotherPic
.pic.onMouseClick { { (x, y) => code }
- runs the given code when the mouse is clicked on the picture. The code has access to the (x, y) of the mouse click.bouncePicVectorOffStage(pic, vel)
- computes a new velocity forpic
moving withvelocity
that collides with the stage border.Vector2D(x, y)
- creates a vector with the two given components. The vector specifies a magnitude and a direction.animate { code }
- schedules your code to be called approximately fifty times per second.
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