Package com.esri.core.geometry

Class SimpleRasterizer

java.lang.Object

com.esri.core.geometry.SimpleRasterizer

public class SimpleRasterizer
extends java.lang.Object

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	SimpleRasterizer.Edge
private static class	SimpleRasterizer.EdgeComparator
static interface	SimpleRasterizer.ScanCallback

Field Summary

Fields

Modifier and Type	Field	Description
private SimpleRasterizer.Edge	activeEdgesTable_
private SimpleRasterizer.ScanCallback	callback_
private static SimpleRasterizer.EdgeComparator	edgeCompare_
static int	EVEN_ODD	Even odd fill rule
private boolean	evenOdd_
private int	height_
private int	maxY_
private int	minY_
private int	numEdges_
private int[]	scanBuffer_
(package private) int	scanPtr_
private SimpleRasterizer.Edge[]	sortBuffer_
private int	sortedNum_
private int	width_
static int	WINDING	Winding fill rule
private SimpleRasterizer.Edge[]	ySortedEdges_

Constructor Summary

Constructors

Constructor	Description
SimpleRasterizer()

Method Summary

Modifier and Type	Method	Description
void	addEdge(double x1, double y1, double x2, double y2)	Add a single edge.
private void	addNewEdgesToAET_(int y)
void	addRing(double[] xy)	Adds edges of the ring to the rasterizer.
(package private) boolean	addSegmentStroke(double x1, double y1, double x2, double y2, double half_width, boolean skip_short, double[] helper_xy_10_elm)
void	addTriangle(double x1, double y1, double x2, double y2, double x3, double y3)	Adds edges of a triangle.
private void	advanceAET_()
private void	emitScans_()
long	estimateMemorySize()
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.
private static int	snap_(int x, int mi, int ma)
private SimpleRasterizer.Edge	sortAET_(SimpleRasterizer.Edge aet)
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

edgeCompare_

private static final SimpleRasterizer.EdgeComparator edgeCompare_

activeEdgesTable_

private SimpleRasterizer.Edge activeEdgesTable_

ySortedEdges_

private SimpleRasterizer.Edge[] ySortedEdges_

sortBuffer_

private SimpleRasterizer.Edge[] sortBuffer_

scanBuffer_

private int[] scanBuffer_

scanPtr_

int scanPtr_

callback_

private SimpleRasterizer.ScanCallback callback_

width_

private int width_

height_

private int height_

minY_

private int minY_

maxY_

private int maxY_

numEdges_

private int numEdges_

sortedNum_

private int sortedNum_

evenOdd_

private boolean evenOdd_

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)

addSegmentStroke

final boolean addSegmentStroke(double x1,
                               double y1,
                               double x2,
                               double y2,
                               double half_width,
                               boolean skip_short,
                               double[] helper_xy_10_elm)

getScanCallback

public final SimpleRasterizer.ScanCallback getScanCallback()

estimateMemorySize

public long estimateMemorySize()

advanceAET_

private final void advanceAET_()

addNewEdgesToAET_

private final void addNewEdgesToAET_(int y)

snap_

private static int snap_(int x,
                         int mi,
                         int ma)

emitScans_

private final void emitScans_()

sortAET_

private final SimpleRasterizer.Edge sortAET_(SimpleRasterizer.Edge aet)