Lab 6

Drawing with Canvas - Due: March 27

Review a the Drawing Tutorial here: Drawing Tutorial

Goal

This is a simple lab - create a nice drawing (or drawings) using canvas. The point is to make sure you have experiance using ALL the drawing elements and methods we have covered so far.

Some Examples to get you thinking are at: 11-Drawing-Examples.html

Make a drawing that using ALL of the following methods and elements:

Colors, Styles, and Shadows

Property Description
fillStyle Sets or returns the color, gradient, or pattern used to fill the drawing
strokeStyle Sets or returns the color, gradient, or pattern used for strokes
shadowColor Sets or returns the color to use for shadows
shadowBlur Sets or returns the blur level for shadows
shadowOffsetX Sets or returns the horizontal distance of the shadow from the shape
shadowOffsetY Sets or returns the vertical distance of the shadow from the shape

Method Description
createLinearGradient() Creates a linear gradient (to use on canvas content)
createPattern() Repeats a specified element in the specified direction
createRadialGradient() Creates a radial/circular gradient (to use on canvas content)
addColorStop() Specifies the colors and stop positions in a gradient object

Line Styles

Property Description
lineCap Sets or returns the style of the end caps for a line
lineJoin Sets or returns the type of corner created, when two lines meet
lineWidth Sets or returns the current line width
miterLimit Sets or returns the maximum miter length

Rectangles

Method Description
rect() Creates a rectangle
fillRect() Draws a "filled" rectangle
strokeRect() Draws a rectangle (no fill)
clearRect() Clears the specified pixels within a given rectangle

Paths

Method Description
fill() Fills the current drawing (path)
stroke() Actually draws the path you have defined
beginPath() Begins a path, or resets the current path
moveTo() Moves the path to the specified point in the canvas, without creating a line
closePath() Creates a path from the current point back to the starting point
lineTo() Adds a new point and creates a line from that point to the last specified point in the canvas
clip() Clips a region of any shape and size from the original canvas
quadraticCurveTo() Creates a quadratic Bézier curve
bezierCurveTo() Creates a cubic Bézier curve
arc() Creates an arc/curve (used to create circles, or parts of circles)
arcTo() Creates an arc/curve between two tangents
isPointInPath() Returns true if the specified point is in the current path, otherwise false

Transformations

Method Description
scale() Scales the current drawing bigger or smaller
rotate() Rotates the current drawing
translate() Remaps the (0,0) position on the canvas
transform() Replaces the current transformation matrix for the drawing
setTransform() Resets the current transform to the identity matrix. Then runs transform()

Text

Property Description
font Sets or returns the current font properties for text content
textAlign Sets or returns the current alignment for text content
textBaseline Sets or returns the current text baseline used when drawing text

Method Description
fillText() Draws "filled" text on the canvas
strokeText() Draws text on the canvas (no fill)
measureText() Returns an object that contains the width of the specified text

Image Drawing

Method Description
drawImage() Draws an image, canvas, or video onto the canvas
Topic revision: r1 - 2013-03-22 - JimSkon
 
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