Page History: Renderer Element
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Page Revision: 2011/07/12 21:11
Renderer is perhaps the most used element for delivering visual stimuli. The element can load and render any library item that contains static graphics. Such library items include bitmap images in any format plus XAML vector graphics.
Element Description
Renderer elements renders a content of the selected library item inside of a selected rectangular area on the screen. The rendering can be tuned with various properties of the Renderer element. For example, you can adjust the size and contrast of the original graphics item and set its rotation angle.
Each Renderer element works with its own list of loaded Library items. It's handy for experimental scenarios where you need to present a visual stimulus selected randomly from a stimulus set. You can form a list by simply dragging library items to a Renderer element in the Element Panel. The items included in the list can be always reordered such that each item has its own integer index. Renderer elements has a property that defines which item is currenlty selected and rendered on the screen. Changing this property will cause rendering of a new item.
Properties of Renderer Element
+=== 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. | | 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 | |
| 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 | |
| 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 | |
| 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. | | Int32 | |
| Pivot Point | Defines the pivot point (coordinate and the rotation centers) within the element viewport. | | stAlignment or Int32 | |
| Visible | Defines whether the element is currently visible on the event surface. The property is convenient for switching visual content on and off. | | Boolean | |
| Rotation | Defines the rotation angle (in degrees) of element viewport relative to the its pivot point. | | Double in the range 0..360 | |
| EFFECTS |
| Transparent Color | The color of the original pixels of rendered content that will be set as transparent. | | stColor | |
| 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) | |
| 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 | |
| Opacity | Opacity of the rendered content. | | Int32, range (0..100) | |
| Contrast | Contrast of the rendered content. | | Int32, range (-100..100) | |
| Brightness | Defines the brighness of the rendered content. | | Int32, range (-100..100) | |
| Saturation | Saturation of the rendered content. | | Double | |
| Pixelation | Defines the pixel scale of the rendering. | | Int32, range (0..100) | |
| 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 | |
| POSITIONAL JITTER |
| Reset Jitter | Set to true at runtime to reset the current positional jitter. | | Boolean, set true for action | |
| Current Jitter | Jitter range, in pixels (non inclusive). | . | clSize | |
| Jitter Range | Jitter range, centered at the original position of the element. | . | clSize | |
+=== Properties inherited from clLibraryElement ===
| Name | Description | Constraints | Value Type | Upon Runtime Change |
|---|
| Material List |
| Selected Index | Defines the index of the active item in the material list of the element. | | Int32 | A change causes the current item to be reloaded and an update of the element. |
| Selected Item | Defines the name of the active item in the material list of the element. The name matches to a name of item in the Material Library | | String | A change causes the current item to be reloaded and an update of the element. |
| Item Count | Returns the total number of items in the material list of the element. | | Int32 |
| Equalize RGB | The property is only available in the visual element. If the value is true, the average RGB pixel intensity will be equalized across all items in the material list. You can turn on this property, when you need to obtain a luminance-balanced set of visual stimulus. | | Boolean | |
+=== 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. | | Boolean |
|
| Title | Title of the element. | | String |
|
The list of Renderer properties: Resource Holder inherited properties | CATEGORY ,Property name | Description | type | Value type |
| RESOURCE LIST | |
| Resource index | The index of item in the resource list that is currently used by the element. Notice, that index starts from 1. | D,R,* | Int32 |
| Resource count | The number of items loaded in the resource list of the element | D,R,Read-only | Int32 |
|
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