What is HTML5 Canvas?

  • The two-dimensional space on which your application draws objects is referred to as the 2D Canvas context.
  • Contextual informastion: color and shadows
  • Cartesian coordinate: positions refered by x and y coordinates
  • Canvas does not have negative points on either axis
  • (0,0) refers to upper left corner of Canvas
  • Absolute addressing: using (20,100) for example
  • Relative addressing: using variables for start, like xPos, YPos so reference is (xPos + 20, yPos+100)
    • Object Attributes
    1. Colors
    2. Gradients; linear and radial
    3. Patterns
    4. Transparency
    5. Shadows
    6. Clipping
  • Apply color with fillStyle and strokeStyle
      • Line Attributes
    1. Colors
    2. Gradients
    3. Patterns
    4. Transparency
    5. Shadows
    6. Clipping
    7. Width
    8. Caps
    9. Joins
Arc Calculations Arc Calculations
Wiki Radian There are approximately 6.3 radians in a circle.

HTML5 Canvas for Dummies

Canvas Hello World

Canvas Rectangle

Canvas Gradient

Canvas Pattern

Canvas Shadows

Canvas Clipping

Canvas Transparency

Canvas Text

Canvas Alignment

Canvas Lines

Canvas MultiSided

Canvas Curves

Canvas Circles

Canvas Corners

Canvas Bezier

Canvas Qadratic

Canvas MultiSegment

Canvas Compositing

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