fglsvgcanvas: SVG drawing module

Table 1. fglsvgcanvas types (fglsvgcanvas.4gl)
Type	Description
`TYPE t_svg_rect RECORD x DECIMAL, y DECIMAL, width DECIMAL, height DECIMAL END RECORD`	The `t_svg_rect` type defines the position and dimensions of a rectangle.

Table 2. fglsvgcanvas constants (fglsvgcanvas.4gl)
Constant	Description
`SVGATT_*` constants	List of predefined SVG attributes.

Table 3. fglsvgcanvas functions (fglsvgcanvas.4gl)
Function	Description
`FUNCTION animateTransform( attributeName STRING, attributeType STRING, type STRING, from STRING, to STRING, by STRING, begin STRING, dur STRING, repeatCount STRING ) RETURNS om.DomNode`	Produces an SVG `"animateTransform"` element.
`FUNCTION circle( cx STRING, cy STRING, r STRING ) RETURNS om.DomNode`	Produces an SVG `"circle"` element.
`FUNCTION clean( cid SMALLINT )`	Deletes all SVG elements inside the SVG canvas.
`FUNCTION clipPath_rect( id STRING, x STRING, y STRING, width STRING, height STRING ) RETURNS om.DomNode`	Produces an SVG `"clipPath"` element with a "`rect`" element.
`FUNCTION color_shade( source STRING, factor DECIMAL ) RETURNS STRING`	Applies a shade factor to an RGB color.
`FUNCTION color_tint( source STRING, factor DECIMAL ) RETURNS STRING`	Applies a tint factor to an RGB color.
`FUNCTION create( name STRING ) RETURNS SMALLINT`	Creates a new SVG canvas handler.
`FUNCTION createChars( value STRING ) RETURNS om.DomNode`	Produces an SVG DOM text node.
`FUNCTION createElement( tagName STRING, id STRING ) RETURNS om.DomNode`	Produces an SVG DOM element with the tag name specified as parameter.
`FUNCTION defs( id STRING ) RETURNS om.DomNode`	Produces an SVG `"defs"` element.
`FUNCTION destroy( cid SMALLINT )`	Releases resources allocated for the SVG canvas.
`FUNCTION display( cid SMALLINT )`	Displays the SVG canvas.
`FUNCTION ellipse( cx STRING, cy STRING, rx STRING, ry STRING ) RETURNS om.DomNode`	Produces an SVG `"ellipse"` element.
`FUNCTION filter( id STRING, x STRING, y STRING, width STRING, height STRING ) RETURNS om.DomNode`	Produces the SVG `"filter"` element.
`FUNCTION finalize( )`	Releases the fglsvgcanvas library.
`FUNCTION g( id STRING ) RETURNS om.DomNode`	Produces an SVG `"g"` element.
`FUNCTION getBBox( cid SMALLINT, id STRING ) RETURNS t_svg_rect`	Returns the bounding box of an SVG element.
`FUNCTION getItemId( cid SMALLINT ) RETURNS STRING`	Returns SVG element id after a user action.
`FUNCTION image( href STRING, x STRING, y STRING, width STRING, height STRING, preserveAspectRatio STRING ) RETURNS om.DomNode`	Produces an SVG `"image"` element.
`FUNCTION initialize( )`	Prepares the fglsvgcanvas library for use.
`FUNCTION line( x1 STRING, y1 STRING, x2 STRING, y2 STRING ) RETURNS om.DomNode`	Produces an SVG `"line"` element.
`FUNCTION linearGradient( id STRING, x1 STRING, y1 STRING, x2 STRING, y2 STRING, spreadMethod STRING, gradientTransform STRING, gradientUnits STRING ) RETURNS om.DomNode`	Produces an SVG `"linearGradient"` element.
`FUNCTION marker( id STRING, markerUnits STRING, refX STRING, refY STRING, markerWidth STRING, markerHeight STRING, orient STRING ) RETURNS om.DomNode`	Produces an SVG `"marker"` element.
`FUNCTION mask( id STRING, x STRING, y STRING, width STRING, height STRING, node om.DomNode, name STRING )`	Produces an SVG `"mask"` element.
`FUNCTION nl_to_tspan( text om.DomNode, x STRING, y STRING, dx STRING, dy STRING, content STRING )`	Converts a string to an SVG `"text"` element with `"tspan"` sub-elements.
`FUNCTION path( d STRING ) RETURNS om.DomNode`	Produces an SVG `"path"` element.
`FUNCTION pattern( id STRING, x STRING, y STRING, width STRING, height STRING, patternUnits STRING, patternContentUnits STRING, patternTransform STRING, preserveAspectRatio STRING ) RETURNS om.DomNode`	Produces an SVG `"pattern"` element.
`FUNCTION polygon( points STRING ) RETURNS om.DomNode`	Produces an SVG `"polygon"` element.
`FUNCTION polyline( points STRING ) RETURNS om.DomNode`	Produces an SVG `"polyline"` element.
`FUNCTION radialgradient( id STRING, cx STRING, cy STRING, fx STRING, fy STRING, r STRING, spreadMethod STRING, gradientTransform STRING, gradientUnits STRING ) RETURNS om.DomNode`	Produces an SVG `"radialGradient"` element.
`FUNCTION rect( x STRING, y STRING, width STRING, height STRING, rx STRING, ry STRING ) RETURNS om.DomNode`	Produces an SVG `"rect"` element.
`FUNCTION removeElement( node om.DomNode )`	Deletes an SVG element from the SVG canvas.
`FUNCTION setAttributes( node om.DomNode, attrs om.SaxAttributes )`	Sets the SVG attributes from an attribute set.
`FUNCTION setCurrent( cid SMALLINT )`	Selects the SVG canvas handler for subsequent SVG canvas API calls.
`FUNCTION setRootSVGAttributes( id STRING, width STRING, height STRING, viewBox STRING, preserveAspectRatio STRING ) RETURNS om.DomNode`	Produces the root SVG element.
`FUNCTION stop( offset STRING, color STRING, opacity STRING ) RETURNS om.DomNode`	Produces an SVG `"stop"` element for gradients.
`FUNCTION styleAttributeList( attrs om.SaxAttributes ) RETURNS STRING`	Builds a string with a list of attributes to be used in a `style` attribute.
`FUNCTION styleDefinition( selector STRING, attrs om.SaxAttributes ) RETURNS STRING`	Produces a CSS style definition with a selection and list of attributes.
`FUNCTION styleList( content STRING ) RETURNS om.DomNode`	Produces a CSS style list.
`FUNCTION svg( id STRING, x STRING, y STRING, width STRING, height STRING, viewBox STRING, preserveAspectRatio STRING RETURNS om.DomNode`	Produces an SVG `"svg"` element.
`FUNCTION symbol( id STRING, width STRING, height STRING, viewBox STRING, preserveAspectRatio STRING, refX STRING, refY STRING ) RETURNS om.DomNode`	Produces an SVG `"symbol"` element.
`FUNCTION text( x STRING, y STRING, content STRING, class STRING ) RETURNS om.DomNode`	Produces an SVG `"text"` element.
`FUNCTION text_path( x STRING, y STRING, content STRING, path STRING class STRING ) RETURNS om.DomNode`	Produces the SVG `"text"` element with a `"textPath"` sub-element.
`FUNCTION text_tref( x STRING, y STRING, tref STRING, class STRING ) RETURNS om.DomNode`	Produces the SVG `"text"` element with a `"tref"` sub-element.
`FUNCTION title( text STRING ) RETURNS om.DomNode`	Produces an SVG `"title"` element.
`FUNCTION tspan( x STRING, y STRING, dx STRING, dy STRING, style STRING, content STRING ) RETURNS om.DomNode`	Produces an SVG `"tspan"` element.
`FUNCTION url( name STRING ) RETURNS STRING`	Produces a `"url(#name)"` reference for SVG elements.
`FUNCTION use( name STRING, x STRING, y STRING ) RETURNS om.DomNode`	Produces an SVG `"use"` element.