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public interface IRenderMetricsFactory
The RenderMetricsFactory is used by the RenderManager (more specifically the RenderCreationDecisive) to obtain metrics on renderer extensions. The RenderMetrics objects are used to decide which renderers to instantiate to render a layer. As the state of udig changes different renderers may be more suited so the RenderMetrics object are also used to judge whether a new renderer should be used for rendering a layer.
Method Summary | |
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boolean |
canRender(IRenderContext context)
This method is used to determine whether the renderer can render the layer. |
IRenderMetrics |
createMetrics(IRenderContext context)
Returns a RenderMetrics object which provides metrics for a renderer while rendering layer using data as the data source and rendering to a viewport
modeled by vmodel . |
java.lang.Class<? extends IRenderer> |
getRendererType()
Returns the type of the Renderer that will be created. |
Method Detail |
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boolean canRender(IRenderContext context) throws java.io.IOException
toolkit
- A toolkit containing reference to everything a renderer needs.
java.io.IOException
IRenderContext
IRenderMetrics createMetrics(IRenderContext context)
layer
using data
as the data source and rendering to a viewport
modeled by vmodel
. NOTE: These metrics is a active object and cached by the
RenderManager. As such no references should be maintained to the objects returned by this
method.
toolkit
- A toolkit containing reference to everything a renderer needs.
layer
using data
as the data source and rendering to a
viewport modeled by vmodel
.IRenderMetrics
,
IRenderContext
java.lang.Class<? extends IRenderer> getRendererType()
Note if this is a MultiLayerRenderer the metrics values will be weighted depending on how many adjacent layers can be rendered by the renderer for the current map.
Please return the class that this RenderMetricsFactory will create (if given the appropriate context).
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