Script Canvas

This package implements the script canvas WebComponent. This WebComponent allows you to run a script in a canvas element. This component runs scripts which are Dwitter-compatible. This means that if the script can be run in the browser console at www.dwitter.net, it will work in the script canvas.

This component is useful for creating interactive art, or for creating interactive visualizations of data. The component conntains a number of useful functions for drawing to the canvas, and for interacting with the canvas. The component also contains a number of useful functions for rendering data to the canvas, including a Scene, a Camera, Meshes, Materials, and Lights.

Usage

pass the script directly by passing text or a function in the script attribute:

<script-canvas script="t=>t"></script-canvas>

You can control the pause state of the script by setting the paused attribute:

<script-canvas paused></script-canvas>

You can control the speed of the script by setting the fps attribute:

<script-canvas fps="30"></script-canvas>

You can control the size of the canvas by setting the width and height attributes:

<script-canvas width="500" height="500"></script-canvas>

You can reset the script by calling the reset method:

<script-canvas id="canvas"></script-canvas>
<script>
  document.getElementById('canvas').reset();
</script>

You can pause the script by calling the pause method:

<script-canvas id="canvas"></script-canvas>
<script>
  document.getElementById('canvas').pause();
</script>

You can resume the script by calling the resume method:

<script-canvas id="canvas"></script-canvas>
<script>
  document.getElementById('canvas').resume();
</script>

Attributes

The script canvas element takes a 'src' attribute which is the script to run. The script can be in text format or passed as a function.

The script also has an 'fps' attribute which is the number of frames per second to run the script at. The default is 60.

The script also has a 'active' property which is a boolean that can be set to true or false to start and stop the script.

The script also has a 'paused' property which is a boolean that can be set to true or false to pause and unpause the script.

The script also has a 'reset' method which can be called to reset the script.

The script also has a 'clear' method which can be called to clear the canvas.

The script also has a 'canvas' property which is the canvas element that the script is running on.

The Script Canvas context

The script canvas context contains the following functions and properties:

Math Functions

The script canvas context contains the following Math functions:

a

The absolute value function.

ac

The arccosine function.

acs

The inverse hyperbolic cosine function.

as

The arcsine function.

ass

The inverse hyperbolic sine function.

at

The arctangent function.

ats

The inverse hyperbolic tangent function.

at2

The arctangent of the quotient of its arguments.

cbrt

The cube root function.

ce

The ceiling function.

clz

The number of leading zero bits in the 32-bit binary representation of a number.

C

The cosine function.

cosh

The hyperbolic cosine function.

E

The exponential function.

expm1

The exponential function minus one.

F

The floor function.

fr

The nearest single precision float representation of a number.

H

The square root of the sum of squares of its arguments.

imul

The 32-bit integer multiplication of two numbers.

L

The natural logarithm function.

lp1

The natural logarithm of one plus its argument.

l10

The base 10 logarithm function.

l2

The base 2 logarithm function.

max

The maximum of zero or more numbers.

min

The minimum of zero or more numbers.

pow

The power function.

R

The random number function.

ro

The nearest integer function.

s

The sign function.

S

The sine function.

sh

The hyperbolic sine function.

Q

The square root function.

T

The tangent function.

th

The hyperbolic tangent function.

tr

The integer part of the number by removing any fractional digits.

Classes

The script canvas context contains a number of useful classes:

M

Properties

M

The Math object.

t

The time in seconds since the script started running.

x

The canvas context.

Canvas Context Functions

bp

The begin path function.

cp

The close path function.

f

The fill function.

fs

Set the fill style to a random color.

fR

The fill rect function.

lT

The line to function.

mT

The move to function.

sT

The stroke function

sS

Set the stroke style to a random color.

sL

The stroke line function.

sR

The stroke rect function.

sT

The stroke text function.

Utility Functions

A number of useful functions are available in the script canvas context.

V2 Function

The V2 function is a 2D vector function. Details for this function can be found in the CLASSES README.

V3 Function

The V3 function is a 3D vector function. Details for this function can be found in the CLASSES README.

P Function

The P function is a 3D point function. Details for this function can be found in the CLASSES README.

M Function

The M function is a 3D matrix function. Details for this function can be found in the CLASSES README.

F2 Function

The F2 function returns the distance between two vectors. Details for this function can be found in the CLASSES README.

A2 Function

The A2 function returns the angle between two vectors. Details for this function can be found in the CLASSES README.

cwt Function

The cwt function is a 2D wavelet transform function. Details for this function can be found in the CLASSES README.

cwt3 Function

The cwt3 function is a 3D wavelet transform function. Details for this function can be found in the CLASSES README.

madd Function

The madd function adds two matrices together. Details for this function can be found in the CLASSES README.

msub Function

The msub function subtracts two matrices. Details for this function can be found in the CLASSES README.

mmul Function

The mmul function multiplies two matrices. Details for this function can be found in the CLASSES README.

mdiv Function

The mdiv function divides two matrices. Details for this function can be found in the CLASSES README.

mzeros Function

The mzeros function creates a matrix of zeros. Details for this function can be found in the CLASSES README.

mones Function

The mones function creates a matrix of ones. Details for this function can be found in the CLASSES README.

mrand Function

The mrand function creates a matrix of random numbers. Details for this function can be found in the CLASSES README.

mfill Function

The mfill function fills a matrix with a value. Details for this function can be found in the CLASSES README.

mcopy Function

The mcopy function copies a matrix. Details for this function can be found in the CLASSES README.

mrow Function

The mrow function returns a row from a matrix. Details for this function can be found in the CLASSES README.

mcol Function

The mcol function returns a column from a matrix. Details for this function can be found in the CLASSES README.

vadd Function

The vadd function adds two vectors together. Details for this function can be found in the CLASSES README.

vsub Function

The vsub function subtracts two vectors. Details for this function can be found in the CLASSES README.

vmul Function

The vmul function multiplies two vectors. Details for this function can be found in the CLASSES README.

vdiv Function

The vdiv function divides two vectors. Details for this function can be found in the CLASSES README.

vdot Function

The vdot function returns the dot product of two vectors. Details for this function can be found in the CLASSES README.

vcross Function

The vcross function returns the cross product of two vectors. Details for this function can be found in the CLASSES README.

vnorm Function

The vnorm function returns the norm of a vector. Details for this function can be found in the CLASSES README.

vunit Function

The vunit function returns the unit vector of a vector. Details for this function can be found in the CLASSES README.

vcopy Function

The vcopy function copies a vector. Details for this function can be found in the CLASSES README.

pgrav Function

The pgrav function returns the gravitational force between two points. Details for this function can be found in the CLASSES README.

electrostatic Function

The electrostatic function returns the electrostatic force between two points. Details for this function can be found in the CLASSES README.

gline Function

The gline function returns the line equation for two points. Details for this function can be found in the CLASSES README.

gline2 Function

The gline2 function returns the line equation for two points. Details for this function can be found in the CLASSES README.

gline3 Function

The gline3 function returns the line equation for two points. Details for this function can be found in the CLASSES README.

bounds Function

The bounds function returns the bounding box for a set of points. Details for this function can be found in the CLASSES README.

gintersect Function

The gintersect function returns the intersection of two lines. Details for this function can be found in the CLASSES README.

rintersect Function

The rintersect function returns the intersection of a line and a plane. Details for this function can be found in the CLASSES README.

raytrace Function

The raytrace function returns the intersection of a line and a set of planes. Details for this function can be found in the CLASSES README.

Script Canvas Classes

A number of useful classes are available in the script canvas context.

tObject Class

The tObject class is a base class for all rendered objects in the script canvas Renderer. It provides a number of useful functions.

tMesh Class

The tMesh class is a class for rendering meshes in the script canvas Renderer. It provides a number of useful functions.

tLine Class

The tLine class is a class for rendering lines in the script canvas Renderer. It provides a number of useful functions.

tPoint Class

The tPoint class is a class for rendering points in the script canvas Renderer. It provides a number of useful functions.

tPlane Class

The tPlane class is a class for rendering planes in the script canvas Renderer. It provides a number of useful functions.

tSphere Class

The tSphere class is a class for rendering spheres in the script canvas Renderer. It provides a number of useful functions.

tLight Class

The tLight class is a class for rendering lights in the script canvas Renderer. It provides a number of useful functions.

tCamera Class

The tCamera class is a class for rendering cameras in the script canvas Renderer. It provides a number of useful functions.

tScene Class

The tScene class is a class for rendering scenes in the script canvas Renderer. It provides a number of useful functions.

tRenderer Class

The tRenderer class is a class for rendering scenes in the script canvas Renderer. It provides a number of useful functions.

License

MIT

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Authors

• Sebastian Schepis - Initial work - sschepis

License

MIT