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Page Revision: 2013/07/24 16:50

Text element allows displaying text blocks for instructions and feedback. Element provides a variety of text decoration options, e.g. font, color and alignment selection. The text content can always be changed and reformatted at runtime.

Snapshots ¶

Text element in the EventIDE scene editor

Multiple textblocks with different fonts (inluding the symbol font), colors and visual effects applied

Multiple textblocks making an instruction screen

Practical Use ¶

Creating a single textblock on a visual scene ¶

1. Select Event where you want to place a textblock
2. Add Text Element into that event, the element will appear at the center of the screen
3. Select the element in the Element List
4. Edit the Text property of the element in the Property Panel. Use the return key to add new lines.
5. Adjust the size of element's rendering area in the Scene Editor with the mouse. Alternatevly, set the uniform font size by adjusting the AutoSize property.
6. Change the font, color and text alignment of the elementif nessesary, with the corresponding properties in the Property Panel
7. Adjust element's screen position, if nessesary
   

Using the text element for delivering visual feedback ¶

1. Add Text Element into a feedback event.
2. Create a Proxy Variable, for example, called FeedbackText, linked to the Text property of the element.
3. Add the following code into any snippet called before activation of the feedback event in each trial (Snippet suggestion- OnDeactivated of the previous event or OnActivating of the parent event)
   

 // Check the trial outcome. Result and RT just other user variables
if (Result==true)
   {
   FeedbackText="Correct";
   }   
else
   {
   FeedbackText="Wrong";
   }

if (RT>5000)
   FeedbackText="Too Late";

Synchronized Internal Actions ¶

Experiment Start	Parent Event Onset	External Trigger / Status Change	Parent Event Offset	Experiment End
	Gets displayed on screen		Is removed from screen

Notes ¶

If you use the transparent background in the parent event and the global backgound is bright, then you may discover that a tiny border around the text is rendered by the Text Element. To prevent this rendering issue from happening you can either set a solid background for the parent event or switch-off the antialiasing in properties of Text Element.

Generic Properties ¶

Name	Description	Constraints	Value Type	Upon Runtime Change
VISUAL APPEARANCE
Text	Multi-line string value that defines a text rendered by the element. Type your text here. Use Enter press to initiate a new text line.		String	Visual Update..
Font Color	Color of the text		stColor	Visual Update..
Auto size	If true, the text rendering area is resized automatically when the text is changed		Boolean	Visual Update..
Font name	Defines the font for the text. Select a font from the list.		Font, String	Visual Update..
Font Size	The size of the font		Double	Visual Update..
Text alignment	Horizontal text alignment inside of a text area.	Design Time..	TextAligment

+=== Properties inherited from clVisualElement ===

Name	Description	Constraints	Value Type	Upon Runtime Change
VISUAL APPEARANCE
Alpha Masking	Defines whether the visual content rendered by this element will be used as an opacity mask which is applied onto the given event surface. The active opacity mask allows one to expose pixels of the parent event surface through a solid background of the given event. If the value is true, the darker pixels of the content will make more transparent holes on the entire event surface.	Design Time..	Boolean
AntiAliasing	If true, the rendered content will be anti-aliased for smoother visual appearance. If false, rendering will be authentic to its source, e.g. a bitmap.		Boolean	Visual Update..
Position	Defines the position of the element viewport on the screen. The position can be set in any of three coordinate systems: a) pixels, b) polar, c) central.		clPoint	Visual Update..
Size	Defines the size of the element viewport on the screen. The size can be set in any of three coordinate systems: a) pixels, b) visual degrees, c) 'relative-to-screen' size.		clSize	Visual Update..
Z Order	Indicates the current depth order of the element viewport on the surface of the parent event. The greatest number corresponds to the top position. The order can be changed by moving the element up and down in the element list.	Status..	Int32
Pivot Point	Defines the pivot point (coordinate and the rotation centers) within the element viewport.		stAlignment or Int32	Visual Update..
Visible	Defines whether the element is currently visible on the event surface. The property is convenient for switching visual content on and off.		Boolean	Visual Update..
Rotation	Defines the rotation angle (in degrees) of element viewport relative to the its pivot point.		Double in the range 0..360	Visual Update..
EFFECTS
Transparent Color	The color of the original pixels of rendered content that will be set as transparent.		stColor	Visual Update..
Transparency Tolerance	Tolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent.		Int32, range (0..100)	Visual Update..
Color Mask	Produces a multiplicative combination of the original pixels and the selected mask color (except the alpha channel). The effect emulates a look through a colored glass. White or transparent mask color doesn't change the original pixels.		stColor	Visual Update..
Opacity	Opacity of the rendered content.		Int32, range (0..100)	Visual Update..
Contrast	Contrast of the rendered content.		Int32, range (-100..100)	Visual Update..
Brightness	Defines the brighness of the rendered content.		Int32, range (-100..100)	Visual Update..
Saturation	Saturation of the rendered content.		Double	Visual Update..
Pixelation	Defines the pixel scale of the rendering.		Int32, range (0..100)	Visual Update..
Blurring	The radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring.		Int32	Visual Update..
POSITIONAL JITTER
Reset Jitter	Set to true at runtime to reset the current positional jitter.	Runtime Command..	Boolean, set true for action	Visual Update..
Current Jitter	Jitter range, in pixels (non inclusive).	.	clSize	Visual Update..
Jitter Range	Jitter range, centered at the original position of the element.	.	clSize	Visual Update..

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String