com.esri.core.geometry

Class SimpleRasterizer

java.lang.Object

com.esri.core.geometry.SimpleRasterizer

public class SimpleRasterizer
extends Object

Simple scanline rasterizer. Caller provides a callback to draw pixels to actual surface.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SimpleRasterizer.ScanCallback

Field Summary

Fields

Modifier and Type	Field and Description
static int	EVEN_ODD Even odd fill rule
static int	WINDING Winding fill rule

Constructor Summary

Constructors

Constructor and Description
SimpleRasterizer()

Method Summary

Modifier and Type	Method and Description
void	addEdge(double x1, double y1, double x2, double y2) Add a single edge.
void	addRing(double[] xy) Adds edges of the ring to the rasterizer.
void	addTriangle(double x1, double y1, double x2, double y2, double x3, double y3) Adds edges of a triangle.
void	fillEnvelope(Envelope2D envIn)
void	flush() Flushes any cached scans.
int	getHeight()
SimpleRasterizer.ScanCallback	getScanCallback()
int	getWidth()
void	renderEdges(int fillMode) Renders all edges added so far, and removes them.
void	setup(int width, int height, SimpleRasterizer.ScanCallback callback) Sets up the rasterizer.
void	startAddingEdges() Call before starting the edges.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EVEN_ODD

public static final int EVEN_ODD

Even odd fill rule

See Also:

Constant Field Values

WINDING

public static final int WINDING

Winding fill rule

See Also:

Constant Field Values

Constructor Detail

SimpleRasterizer

public SimpleRasterizer()

Method Detail

setup

public void setup(int width,
                  int height,
                  SimpleRasterizer.ScanCallback callback)

Sets up the rasterizer.

getWidth

public final int getWidth()

getHeight

public final int getHeight()

flush

public final void flush()

Flushes any cached scans.

addTriangle

public final void addTriangle(double x1,
                              double y1,
                              double x2,
                              double y2,
                              double x3,
                              double y3)

Adds edges of a triangle.

addRing

public final void addRing(double[] xy)

Adds edges of the ring to the rasterizer.

Parameters:

xy - interleaved coordinates x1, y1, x2, y2,...

startAddingEdges

public final void startAddingEdges()

Call before starting the edges. For example to render two polygons that consist of a single ring: startAddingEdges(); addRing(...); renderEdges(Rasterizer.EVEN_ODD); addRing(...); renderEdges(Rasterizer.EVEN_ODD); For example to render a polygon consisting of three rings: startAddingEdges(); addRing(...); addRing(...); addRing(...); renderEdges(Rasterizer.EVEN_ODD);

renderEdges

public final void renderEdges(int fillMode)

Renders all edges added so far, and removes them. Calls startAddingEdges after it's done.

Parameters:

fillMode - Fill mode for the polygon fill can be one of two values: EVEN_ODD or WINDING. Note, as any other graphics algorithm, the scan line rasterizer doesn't require polygons to be topologically simple, or have correct ring orientation.

addEdge

public final void addEdge(double x1,
                          double y1,
                          double x2,
                          double y2)

Add a single edge.

Parameters:

x1 -

y1 -

x2 -

y2 -

fillEnvelope

public final void fillEnvelope(Envelope2D envIn)

getScanCallback

public final SimpleRasterizer.ScanCallback getScanCallback()