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DrawStrings_SingleColor


This is Filter Equivalent. This function may be present in generated code, but should not be used in hand-written code.

Header: AVL.h
Namespace: avs

Draws strings (text) on an image with a single color.

Syntax

void avs::DrawStrings_SingleColor
(
	const avl::Image& inImage,
	atl::Conditional<const atl::Array<atl::Conditional<atl::String> > &> inStrings,
	atl::Conditional<const atl::Array<atl::Conditional<avl::Location> > &> inLocations,
	atl::Optional<const avl::CoordinateSystem2D&> inLocationAlignment,
	const avl::Anchor2D::Type inLocationAnchor,
	const avl::Pixel& inColor,
	const avl::DrawingStyle& inDrawingStyle,
	float inSize,
	float inOrientationAngle,
	const bool inForceRgb,
	atl::Optional<const avl::Pixel&> inBackgroundColor,
	avl::Image& outImage
)

Parameters

Name Type Range Default Description
Input value inImage const Image& Input image
Input value inStrings Conditional<const Array<Conditional<String> > &> { } Strings to be drawn.
Input value inLocations Conditional<const Array<Conditional<Location> > &> { } Center position of strings
Input value inLocationAlignment Optional<const CoordinateSystem2D&> NIL
Input value inLocationAnchor const Anchor2D::Type MiddleCenter
Input value inColor const Pixel&
Input value inDrawingStyle const DrawingStyle& DrawingStyle ( DrawingMode: HighQuality Opacity: 1.0f Thickness: 1.0f Filled: False PointShape: Nil PointSize: 1.0f )
Input value inSize float 10.0 - 16.0f Height of a character in pixels
Input value inOrientationAngle float 0.0f Orientation of text in degrees
Input value inForceRgb const bool True Filter will convert monochromatic image to RGB if needed
Input value inBackgroundColor Optional<const Pixel&> NIL Color of pixels drawn on image in text row
Output value outImage Image& Output image

In-place Processing

This function supports in-place data processing - you can pass the same reference to inImage and outImage

Read more about In-place Computation.

Description

The operation draws a strings on the inImage aligning the inLocationAnchor location of the text at the inLocations of the inImage. The height of the font is fixed and equals 16 pixels.

Hints

  • If you want to draw on an empty background, use EmptyImage function before.
  • Define inStrings. This will be the primitives to be drawn.
  • For each of the strings also define its location by setting the inLocations input.
  • If the locations provided on the inLocations input are in a local coordinate system, also set the inLocationAlignment input.
  • Set inLocationAnchor do define how each of the strings should be aligned in relation to its location.
  • Define the font size by setting the inSize input. Recommended values are: 16, 32, 48, 64.
  • Define inColor. Please note, that on an N-channel image only first N components of the color will be used.
  • Set inForceRgb to True, if you want to get a 3-channel output regardless of what is on the input.
  • Set inDrawingStyle to control quality, opacity, thickness, filling, point shapes and sizes.

Examples

Example usage of the DrawStrings_SingleColor on an empty image.

Errors

List of possible exceptions:

Error type Description
DomainError String and location arrays do not match in DrawStrings_SingleColor.

See Also

  • DrawLine – Draws a line on an image.
  • DrawPath – Draws a path on an image.