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ObjectStreamingRenderer
public final class StreamingRenderer
A streaming implementation of the GTRenderer interface.
The streaming renderer is not thread safe
Field Summary | |
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static String |
DECLARED_SCALE_DENOM_KEY
|
static String |
DPI_KEY
|
static String |
LABEL_CACHE_KEY
|
protected LabelCache |
labelCache
|
static String |
LINE_WIDTH_OPTIMIZATION_KEY
Whether the thin line width optimization should be used, or not. |
static String |
MEMORY_PRE_LOADING_KEY
|
static String |
OPTIMIZE_FTS_RENDERING_KEY
Boolean flag controlling a memory/speed trade off related to how multiple feature type styles are rendered. |
static String |
OPTIMIZED_DATA_LOADING_KEY
|
static String |
SCALE_ACCURATE
Computes the scale as the ratio between map distances and real world distances, assuming 90dpi and taking into consideration projection deformations and actual earth shape. |
static String |
SCALE_COMPUTATION_METHOD_KEY
|
static String |
SCALE_OGC
Very simple and lenient scale computation method that conforms to the OGC SLD specification 1.0, page 26. |
static String |
TEXT_RENDERING_KEY
The text rendering method, either TEXT_RENDERING_OUTLINE or TEXT_RENDERING_STRING |
static String |
TEXT_RENDERING_OUTLINE
Text will be rendered using the associated GlyphVector outline, that is, a Shape . |
static String |
TEXT_RENDERING_STRING
Text will be rendered using the usual calls gc.drawString/drawGlyphVector. |
Constructor Summary | |
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StreamingRenderer()
Creates a new instance of LiteRenderer without a context. |
Method Summary | |
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void |
addRenderListener(RenderListener listener)
adds a listener that responds to error events of feature rendered events. |
boolean |
getConcatTransforms()
Flag which controls behaviour for applying affine transformation to the graphics object. |
MapContext |
getContext()
|
double |
getGeneralizationDistance()
Returns the generalization distance in the screen space. |
RenderingHints |
getJava2DHints()
|
static MathTransform |
getMathTransform(CoordinateReferenceSystem sourceCRS,
CoordinateReferenceSystem destCRS)
|
int |
getMaxBackBufferMemory(int width,
int height)
When drawing in optimized mode a 32bit surface is created for each FeatureTypeStyle other than the first in order to draw features in parallel while respecting the feature draw ordering multiple FTS impose. |
Map |
getRendererHints()
|
boolean |
isCanTransform()
|
boolean |
isInteractive()
Getter for property interactive. |
void |
paint(Graphics2D graphics,
Rectangle paintArea,
AffineTransform worldToScreen)
Deprecated. Use paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea) or paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea, AffineTransform worldToScreen) instead. |
void |
paint(Graphics2D graphics,
Rectangle paintArea,
Envelope mapArea)
Deprecated. Use paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea) or paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea, AffineTransform worldToScreen) instead. |
void |
paint(Graphics2D graphics,
Rectangle paintArea,
Envelope mapArea,
AffineTransform worldToScreen)
Deprecated. Use paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea) or paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea, AffineTransform worldToScreen) instead. |
void |
paint(Graphics2D graphics,
Rectangle paintArea,
ReferencedEnvelope mapArea)
Renders features based on the map layers and their styles as specified in the map context using setContext . |
void |
paint(Graphics2D graphics,
Rectangle paintArea,
ReferencedEnvelope mapArea,
AffineTransform worldToScreen)
Renders features based on the map layers and their styles as specified in the map context using setContext . |
void |
removeRenderListener(RenderListener listener)
Removes a render listener. |
void |
setConcatTransforms(boolean flag)
Sets the flag which controls behaviour for applying affine transformation to the graphics object. |
void |
setContext(MapContext context)
|
void |
setGeneralizationDistance(double d)
Sets the generalizazion distance in the screen space. |
void |
setInteractive(boolean interactive)
Sets the interactive status of the renderer. |
void |
setJava2DHints(RenderingHints hints)
|
void |
setRendererHints(Map hints)
|
void |
stopRendering()
If you call this method from another thread than the one that called paint or render the rendering will be
forcefully stopped before termination |
Methods inherited from class Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final String SCALE_ACCURATE
public static final String SCALE_OGC
protected LabelCache labelCache
public static final String TEXT_RENDERING_STRING
public static final String TEXT_RENDERING_OUTLINE
GlyphVector
outline, that is, a Shape
.
This ensures perfect centering between the text and the halo, but introduces more text aliasing.
public static final String TEXT_RENDERING_KEY
public static final String LINE_WIDTH_OPTIMIZATION_KEY
When rendering non antialiased lines adopting a width of 0 makes the java2d renderer get into a fast path that generates the same output as a 1 pixel wide line
Unfortunately for antialiased rendering that optimization does not help, and disallows controlling the width of thin lines. It is provided as an explicit option as the optimization has been hard coded for years, removing it when antialiasing is on by default will invalidate lots of existing styles (making lines appear thicker).
public static final String OPTIMIZE_FTS_RENDERING_KEY
When enabled (by default) multiple feature type styles against the same data source will be rendered in separate memory back buffers in a way that allows the source to be scanned only once (each back buffer is as big as the image being rendered).
When disabled no memory back buffers will be used but the feature source will be scanned once for every feature type style declared against it
public static final String LABEL_CACHE_KEY
public static final String DPI_KEY
public static final String DECLARED_SCALE_DENOM_KEY
public static final String MEMORY_PRE_LOADING_KEY
public static final String OPTIMIZED_DATA_LOADING_KEY
public static final String SCALE_COMPUTATION_METHOD_KEY
Constructor Detail |
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public StreamingRenderer()
Method Detail |
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public void setConcatTransforms(boolean flag)
flag
- If true then the transform will be concatenated to the
existing transform. If false it will be replaced.public boolean getConcatTransforms()
public void addRenderListener(RenderListener listener)
addRenderListener
in interface GTRenderer
listener
- the listener to add.RenderListener
public void removeRenderListener(RenderListener listener)
removeRenderListener
in interface GTRenderer
listener
- the listener to remove.RenderListener
public void stopRendering()
paint
or render
the rendering will be
forcefully stopped before termination
stopRendering
in interface GTRenderer
public void paint(Graphics2D graphics, Rectangle paintArea, AffineTransform worldToScreen)
setContext
. This version of
the method assumes that the size of the output area and the
transformation from coordinates to pixels are known. The latter
determines the map scale. The viewport (the visible part of the map) will
be calculated internally.
paint
in interface GTRenderer
graphics
- The graphics object to draw to.paintArea
- The size of the output area in output units (eg: pixels).worldToScreen
- A transform which converts World coordinates to Screen
coordinates.public void paint(Graphics2D graphics, Rectangle paintArea, Envelope mapArea)
setContext
. This version of
the method assumes that the area of the visible part of the map and the
size of the output area are known. The transform between the two is
calculated internally.
paint
in interface GTRenderer
graphics
- The graphics object to draw to.paintArea
- The size of the output area in output units (eg: pixels).mapArea
- the map's visible area (viewport) in map coordinates.public void paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea)
setContext
. This version of
the method assumes that the area of the visible part of the map and the
size of the output area are known. The transform between the two is
calculated internally.
paint
in interface GTRenderer
graphics
- The graphics object to draw to.paintArea
- The size of the output area in output units (eg: pixels).mapArea
- the map's visible area (viewport) in map coordinates.public void paint(Graphics2D graphics, Rectangle paintArea, Envelope mapArea, AffineTransform worldToScreen)
setContext
. This version of
the method assumes that paint area, envelope and worldToScreen transform
are already computed. Use this method to avoid recomputation. Note
however that no check is performed that they are really in sync!
paint
in interface GTRenderer
graphics
- The graphics object to draw to.paintArea
- The size of the output area in output units (eg: pixels).mapArea
- the map's visible area (viewport) in map coordinates.worldToScreen
- A transform which converts World coordinates to Screen
coordinates.public void paint(Graphics2D graphics, Rectangle paintArea, ReferencedEnvelope mapArea, AffineTransform worldToScreen)
setContext
. This version of
the method assumes that paint area, envelope and worldToScreen transform
are already computed. Use this method to avoid recomputation. Note
however that no check is performed that they are really in sync!
paint
in interface GTRenderer
graphics
- The graphics object to draw to.paintArea
- The size of the output area in output units (eg: pixels).mapArea
- the map's visible area (viewport) in map coordinates. Its
associate CRS is ALWAYS 2DworldToScreen
- A transform which converts World coordinates to Screen
coordinates.public int getMaxBackBufferMemory(int width, int height)
MapContext
,
assuming the feature type style optimizations are turned on (in the case they are off,
no extra memory will be used).
width
- the image widthheight
- the image heightpublic boolean isInteractive()
public void setInteractive(boolean interactive)
interactive
- new value for the interactive propertypublic double getGeneralizationDistance()
public void setGeneralizationDistance(double d)
Sets the generalizazion distance in the screen space.
Default value is 0.8, meaning that two subsequent points are collapsed to one if their on screen distance is less than one pixel
Set the distance to 0 if you don't want any kind of generalization
d
- public void setJava2DHints(RenderingHints hints)
setJava2DHints
in interface GTRenderer
public RenderingHints getJava2DHints()
getJava2DHints
in interface GTRenderer
public void setRendererHints(Map hints)
setRendererHints
in interface GTRenderer
public Map getRendererHints()
getRendererHints
in interface GTRenderer
public void setContext(MapContext context)
setContext
in interface GTRenderer
public MapContext getContext()
getContext
in interface GTRenderer
public boolean isCanTransform()
public static MathTransform getMathTransform(CoordinateReferenceSystem sourceCRS, CoordinateReferenceSystem destCRS)
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