Pixel Aperture Element

Modified on 2018/07/16 01:49 by Administrator Categorized as Elements, Visual Stimuli
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== Summary ==
{s:Element Info Panel
| title=Pixel Aperture
| category=Visual Stimuli
| icon=[image|Element Icon|{UP(Pixel-Aperture-Element)}Pixel-Aperture-Element-Icon.png]
| author= OkazoLab
| addin= Base Layer
| scope= Parent event
| usage= Stimulus screen
| ownsnippets= None
}
== Properties ==
{|
|-
! Name
! Description                              
! Constraints
! Type
! On<br/>runtime<br/>change
|-
| colspan="5" bgcolor="#AADDDDD" | Settings
|-
| Pixels        
| This property provides a fast interface to pixels inside of the aperture viewport on the parent event's surface. Brightness of each pixel is represented by normalized double value [0..1] that can be accessed by the x and y indices. E.g. Pixels[2,10] represents a pixel with coordinates X=2 and Y=10, starting from the left-top corner of the aperture viewport. All pixel values can be read and written in code.        
| {s:atNormal}        
| clPixe..        
|  
|-
| Pixel Step        
| Returns X,Y steps in the normalized coordinates that corresponds to 1 screen pixel on the corresponding axis. The read-only values can be used for looping through all pixels in the aperture, when normalized indices are used with the Pixels property.        
| {s:atStatus}        
| Point        
|  
|-
| colspan="5" bgcolor="#AADDDDD" | Visual Appearance
|-
| Alpha Masking        
| Defines, whether the visual content is used to create an opacity mask on the event surface. If masking is on, the content's pixel luminance (or, its inverse) defines transparency within element's viewport. The alpha masking allows, for example, create transparent holes on the event surface.        
| {s:atDesign}        
| Int32        
|  
|-
| Position        
| Defines a position of the rendering viewport on the screen        
| {s:atNormal}        
| clPoint        
|  
|-
| Size        
| Defines a size of the element's rendering viewport on the screen        
| {s:atNormal}        
| clSize        
|  
|-
| Z Order        
| Indicates Z Order of the element on the given event        
| {s:atStatus}        
| Int32        
|  
|-
| Pivot Point        
| Defines alignment of the pivot point (or, element's position) relative to element's rendering area. The pivot point sets the center of element's rotation and scale directions.        
| {s:atNormal}        
| stAlig..        
|  
|-
| Visible        
| Defines whether the element is visible        
| {s:atNormal}        
| Boolean        
|  
|-
| Rotation        
| Rotation angle in degrees        
| {s:atNormal}        
| Double        
|  
|-
| colspan="5" bgcolor="#AADDDDD" | Effects
|-
| Transparent Color        
| The color of the original pixels of rendered content that will be set as transparent        
| {s:atNormal}        
| stColor        
|  
|-
| Transparent Tolerance        
| Tolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent        
| {s:atNormal}        
| Int32        
|  
|-
| Opacity        
| Opacity of the rendered content        
| {s:atNormal}        
| Int32        
|  
|-
| Contrast        
| Contrast of the rendered content        
| {s:atNormal}        
| Int32        
|  
|-
| Brightness        
| Brightness the rendered content        
| {s:atNormal}        
| Int32        
|  
|-
| Pixelation        
| Pixelation of the rendered content        
| {s:atNormal}        
| Int32        
|  
|-
| Blurring        
| The radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring.        
| {s:atNormal}        
| Int32        
|  
|-
| Scrambling        
|         
| {s:atNormal}        
| Double        
|  
|-
| Scrambling Grid Size        
| Defines a size of the scrambling grid        
| {s:atNormal}        
| clSize        
|  
|-
| colspan="5" bgcolor="#AADDDDD" | Positional Jitter
|-
| Reset Jitter Now        
| Runtime command that resets the positional jitter.        
| {s:atRuntimeAction}        
| Boolean        
|  
|-
| Current Jitter        
| Returns the current jitter        
| {s:atStatus}        
| clPoint        
|  
|-
| Jitter Range        
| Defines a possible range for the random jitter. The range is centered to the position of the element.        
| {s:atNormal}        
| clSize        
|  
|-
| colspan="5" bgcolor="#AADDDDD" | Control
|-
| Is Enabled        
| If set to false the element is completely omitted when the experiment is run        
| {s:atDesign}        
| Boolean        
|  
|-
| Title        
| Title of the element        
| {s:atDesign}        
| String        
|  
|-            
|}
== ==
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'''Pixel Aperture element''' allows fast access to pixel values on the parent event surface. The pixels within the selected aperture on the screen can be read and written in code, e.g. in order to create a custom stimulus generator or drawing. {br}{br}
{TOC}
== Description ==
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== Snapshots ==
{|
| [imageleft|Snapshot 1 <br/>|{UP(page - name)}*-sm.png |{UP(page - name)}*.png]
|| [imageleft|Snapshot 2 |{UP(page - name)}*-sm.png |{UP(page - name)}*.png]
|}
== Practical Use ==
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=== Technique 1 ===
# Step 1
# Step 2
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=== Technique 2 ===
# Step 1
# Step 2
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<div style="margin-left:0px; margin-right:10px; margin-top:10px; width: auto; overflow: hidden; height: auto; background: #fafafa; background: -webkit-gradient(linear, left top, left bottom, from(#fbfbfb), to(#fafafa));background: -moz-linear-gradient(top, #fbfbfb, #fafafa);border: 1px dashed #ddd;box-shadow: 0 0 0 3px #fff, 0 0 0 5px #ddd, 0 0 0 10px #fff, 0 0 2px 10px #eee;">
@@ csharp // Check the trial outcome. Result and RT just other user variables
// insert code snippet here..
@@</div>           
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== Notes ==
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Pixel Aperture Element
