processing/core/src/processing/opengl/LinePath.java at master · 2php/processing · GitHub

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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

* This code is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License version 2 only, as

* published by the Free Software Foundation. Sun designates this

* particular file as subject to the "Classpath" exception as provided

* by Sun in the LICENSE file that accompanied this code.

* This code is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License

* version 2 for more details (a copy is included in the LICENSE file that

* accompanied this code).

* You should have received a copy of the GNU General Public License version

* 2 along with this work; if not, write to the Free Software Foundation,

* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

* CA 95054 USA or visit www.sun.com if you need additional information or

* have any questions.

package processing.opengl;

import processing.core.PMatrix2D;

/**

* The {@code LinePath} class allows to represent polygonal paths,

* potentially composed by several disjoint polygonal segments.

* It can be iterated by the {@link PathIterator} class including all

* of its segment types and winding rules

public class LinePath {

/**

* The winding rule constant for specifying an even-odd rule

* for determining the interior of a path.

* The even-odd rule specifies that a point lies inside the

* path if a ray drawn in any direction from that point to

* infinity is crossed by path segments an odd number of times.

public static final int WIND_EVEN_ODD = 0;

/**

* The winding rule constant for specifying a non-zero rule

* for determining the interior of a path.

* The non-zero rule specifies that a point lies inside the

* path if a ray drawn in any direction from that point to

* infinity is crossed by path segments a different number

* of times in the counter-clockwise direction than the

* clockwise direction.

public static final int WIND_NON_ZERO = 1;

/**

* Starts segment at a given position.

public static final byte SEG_MOVETO = 0;

/**

* Extends segment by adding a line to a given position.

public static final byte SEG_LINETO = 1;

/**

* Closes segment at current position.

public static final byte SEG_CLOSE = 2;

/**

* Joins path segments by extending their outside edges until they meet.

public final static int JOIN_MITER = 0;

/**

* Joins path segments by rounding off the corner at a radius of half the line

* width.

public final static int JOIN_ROUND = 1;

/**

* Joins path segments by connecting the outer corners of their wide outlines

* with a straight segment.

public final static int JOIN_BEVEL = 2;

/**

* Ends unclosed subpaths and dash segments with no added decoration.

public final static int CAP_BUTT = 0;

/**

* Ends unclosed subpaths and dash segments with a round decoration that has a

* radius equal to half of the width of the pen.

public final static int CAP_ROUND = 1;

/**

* Ends unclosed subpaths and dash segments with a square projection that

* extends beyond the end of the segment to a distance equal to half of the

* line width.

public final static int CAP_SQUARE = 2;

private static PMatrix2D identity = new PMatrix2D();

private static float defaultMiterlimit = 10.0f;

static final int INIT_SIZE = 20;

static final int EXPAND_MAX = 500;

protected byte[] pointTypes;

protected float[] floatCoords;

protected int[] pointColors;

protected int numTypes;

protected int numCoords;

protected int windingRule;

/**

* Constructs a new empty single precision {@code LinePath} object with a

* default winding rule of {@link #WIND_NON_ZERO}.

public LinePath() {

this(WIND_NON_ZERO, INIT_SIZE);

}

/**

* Constructs a new empty single precision {@code LinePath} object with the

* specified winding rule to control operations that require the interior of

* the path to be defined.

* @param rule

* the winding rule

* @see #WIND_EVEN_ODD

* @see #WIND_NON_ZERO

public LinePath(int rule) {

this(rule, INIT_SIZE);

}

/**

* Constructs a new {@code LinePath} object from the given specified initial

* values. This method is only intended for internal use and should not be

* made public if the other constructors for this class are ever exposed.

* @param rule

* the winding rule

* @param initialCapacity

* the size to make the initial array to store the path segment types

public LinePath(int rule, int initialCapacity) {

setWindingRule(rule);

this.pointTypes = new byte[initialCapacity];

floatCoords = new float[initialCapacity * 2];

pointColors = new int[initialCapacity];

}

void needRoom(boolean needMove, int newPoints) {

if (needMove && numTypes == 0) {

throw new RuntimeException("missing initial moveto "

+ "in path definition");

}

int size = pointTypes.length;

if (numTypes >= size) {

int grow = size;

if (grow > EXPAND_MAX) {

grow = EXPAND_MAX;

}

pointTypes = copyOf(pointTypes, size + grow);

}

size = floatCoords.length;

if (numCoords + newPoints * 2 > size) {

int grow = size;

if (grow > EXPAND_MAX * 2) {

grow = EXPAND_MAX * 2;

}

if (grow < newPoints * 2) {

grow = newPoints * 2;

}

floatCoords = copyOf(floatCoords, size + grow);

}

size = pointColors.length;

if (numCoords/2 + newPoints > size) {

int grow = size;

if (grow > EXPAND_MAX) {

grow = EXPAND_MAX;

}

if (grow < newPoints) {

grow = newPoints;

}

pointColors = copyOf(pointColors, size + grow);

}

/**

* Adds a point to the path by moving to the specified coordinates specified

* in float precision.

* <p>

* This method provides a single precision variant of the double precision

* {@code moveTo()} method on the base {@code LinePath} class.

* @param x

* the specified X coordinate

* @param y

* the specified Y coordinate

* @see LinePath#moveTo

public final void moveTo(float x, float y, int c) {

if (numTypes > 0 && pointTypes[numTypes - 1] == SEG_MOVETO) {

floatCoords[numCoords - 2] = x;

floatCoords[numCoords - 1] = y;

pointColors[numCoords/2-1] = c;

} else {

needRoom(false, 1);

pointTypes[numTypes++] = SEG_MOVETO;

floatCoords[numCoords++] = x;

floatCoords[numCoords++] = y;

pointColors[numCoords/2-1] = c;

}

/**

* Adds a point to the path by drawing a straight line from the current

* coordinates to the new specified coordinates specified in float precision.

* <p>

* This method provides a single precision variant of the double precision

* {@code lineTo()} method on the base {@code LinePath} class.

* @param x

* the specified X coordinate

* @param y

* the specified Y coordinate

* @see LinePath#lineTo

public final void lineTo(float x, float y, int c) {

needRoom(true, 1);

pointTypes[numTypes++] = SEG_LINETO;

floatCoords[numCoords++] = x;

floatCoords[numCoords++] = y;

pointColors[numCoords/2-1] = c;

}

/**

* The iterator for this class is not multi-threaded safe, which means that

* the {@code LinePath} class does not guarantee that modifications to the

* geometry of this {@code LinePath} object do not affect any iterations of that

* geometry that are already in process.

public PathIterator getPathIterator() {

return new PathIterator(this);

}

/**

* Closes the current subpath by drawing a straight line back to the

* coordinates of the last {@code moveTo}. If the path is already closed then

* this method has no effect.

public final void closePath() {

if (numTypes == 0 || pointTypes[numTypes - 1] != SEG_CLOSE) {

needRoom(false, 0);

pointTypes[numTypes++] = SEG_CLOSE;

}

/**

* Returns the fill style winding rule.

* @return an integer representing the current winding rule.

* @see #WIND_EVEN_ODD

* @see #WIND_NON_ZERO

* @see #setWindingRule

public final int getWindingRule() {

return windingRule;

}

/**

* Sets the winding rule for this path to the specified value.

* @param rule

* an integer representing the specified winding rule

* @exception IllegalArgumentException

* if {@code rule} is not either {@link #WIND_EVEN_ODD} or

* {@link #WIND_NON_ZERO}

* @see #getWindingRule

public final void setWindingRule(int rule) {

if (rule != WIND_EVEN_ODD && rule != WIND_NON_ZERO) {

throw new IllegalArgumentException("winding rule must be "

+ "WIND_EVEN_ODD or " + "WIND_NON_ZERO");

}

windingRule = rule;

}

/**

* Resets the path to empty. The append position is set back to the beginning

* of the path and all coordinates and point types are forgotten.

public final void reset() {

numTypes = numCoords = 0;

}

static public class PathIterator {

float floatCoords[];

int typeIdx;

int pointIdx;

int colorIdx;

LinePath path;

static final int curvecoords[] = { 2, 2, 0 };

PathIterator(LinePath p2df) {

this.path = p2df;

this.floatCoords = p2df.floatCoords;

pointIdx = 0;

colorIdx = 0;

}

public int currentSegment(float[] coords) {

int type = path.pointTypes[typeIdx];

int numCoords = curvecoords[type];

if (numCoords > 0) {

System.arraycopy(floatCoords, pointIdx, coords, 0, numCoords);

int color = path.pointColors[colorIdx];

coords[numCoords + 0] = (color >> 24) & 0xFF;

coords[numCoords + 1] = (color >> 16) & 0xFF;

coords[numCoords + 2] = (color >> 8) & 0xFF;

coords[numCoords + 3] = (color >> 0) & 0xFF;

}

return type;

}

public int currentSegment(double[] coords) {

int type = path.pointTypes[typeIdx];

int numCoords = curvecoords[type];

if (numCoords > 0) {

for (int i = 0; i < numCoords; i++) {

coords[i] = floatCoords[pointIdx + i];

}

int color = path.pointColors[colorIdx];

coords[numCoords + 0] = (color >> 24) & 0xFF;

coords[numCoords + 1] = (color >> 16) & 0xFF;

coords[numCoords + 2] = (color >> 8) & 0xFF;

coords[numCoords + 3] = (color >> 0) & 0xFF;

}

return type;

}

public int getWindingRule() {

return path.getWindingRule();

}

public boolean isDone() {

return (typeIdx >= path.numTypes);

}

public void next() {

int type = path.pointTypes[typeIdx++];

if (0 < curvecoords[type]) {

pointIdx += curvecoords[type];

colorIdx++;

}

/////////////////////////////////////////////////////////////////////////////

// Stroked path methods

static public LinePath createStrokedPath(LinePath src, float weight,

int caps, int join) {

return createStrokedPath(src, weight, caps, join, defaultMiterlimit, null);

}

static public LinePath createStrokedPath(LinePath src, float weight,

int caps, int join, float miterlimit) {

return createStrokedPath(src, weight, caps, join, miterlimit, null);

}

/**

* Constructs a solid <code>LinePath</code> with the specified attributes.

* @param src

* the original path to be stroked

* @param weight

* the weight of the stroked path

* @param caps

* the decoration of the ends of the segments in the path

* @param join

* the decoration applied where path segments meet

* @param miterlimit

* @param transform

static public LinePath createStrokedPath(LinePath src, float weight,

int caps, int join,

float miterlimit, PMatrix2D transform) {

final LinePath dest = new LinePath();

strokeTo(src, weight, caps, join, miterlimit, transform, new LineStroker() {

@Override

public void moveTo(int x0, int y0, int c0) {

dest.moveTo(S15_16ToFloat(x0), S15_16ToFloat(y0), c0);

}

@Override

public void lineJoin() {

}

@Override

public void lineTo(int x1, int y1, int c1) {

dest.lineTo(S15_16ToFloat(x1), S15_16ToFloat(y1), c1);

}

@Override

public void close() {

dest.closePath();

}

@Override

public void end() {

}

});

return dest;

}

private static void strokeTo(LinePath src, float width, int caps, int join,

float miterlimit, PMatrix2D transform,

LineStroker lsink) {

lsink = new LineStroker(lsink, FloatToS15_16(width), caps, join,

FloatToS15_16(miterlimit),

transform == null ? identity : transform);

PathIterator pi = src.getPathIterator();

pathTo(pi, lsink);

}

private static void pathTo(PathIterator pi, LineStroker lsink) {

float coords[] = new float[6];

while (!pi.isDone()) {

int color;

switch (pi.currentSegment(coords)) {

case SEG_MOVETO:

color = ((int)coords[2]<<24) |

((int)coords[3]<<16) |

((int)coords[4]<< 8) |

(int)coords[5];

lsink.moveTo(FloatToS15_16(coords[0]), FloatToS15_16(coords[1]), color);

break;

case SEG_LINETO:

color = ((int)coords[2]<<24) |

((int)coords[3]<<16) |

((int)coords[4]<< 8) |

(int)coords[5];

lsink.lineJoin();

lsink.lineTo(FloatToS15_16(coords[0]), FloatToS15_16(coords[1]), color);

break;

case SEG_CLOSE:

lsink.lineJoin();

lsink.close();

break;

default:

throw new InternalError("unknown flattened segment type");

}

pi.next();

}

lsink.end();

}

/////////////////////////////////////////////////////////////////////////////

// Utility methods

public static float[] copyOf(float[] source, int length) {

float[] target = new float[length];

for (int i = 0; i < target.length; i++) {

if (i > source.length - 1)

target[i] = 0f;

else

target[i] = source[i];

}

return target;

}

public static byte[] copyOf(byte[] source, int length) {

byte[] target = new byte[length];

for (int i = 0; i < target.length; i++) {

if (i > source.length - 1)

target[i] = 0;

else

target[i] = source[i];

}

return target;

}

public static int[] copyOf(int[] source, int length) {

int[] target = new int[length];

for (int i = 0; i < target.length; i++) {

if (i > source.length - 1)

target[i] = 0;

else

target[i] = source[i];

}

return target;

}

// From Ken Turkowski, _Fixed-Point Square Root_, In Graphics Gems V

public static int isqrt(int x) {

int fracbits = 16;

int root = 0;

int remHi = 0;

int remLo = x;

int count = 15 + fracbits / 2;

do {

remHi = (remHi << 2) | (remLo >>> 30); // N.B. - unsigned shift R

remLo <<= 2;

root <<= 1;

int testdiv = (root << 1) + 1;

if (remHi >= testdiv) {

remHi -= testdiv;

root++;

}

} while (count-- != 0);

return root;

}

public static long lsqrt(long x) {

int fracbits = 16;

long root = 0;

long remHi = 0;

long remLo = x;

int count = 31 + fracbits / 2;

do {

remHi = (remHi << 2) | (remLo >>> 62); // N.B. - unsigned shift R

remLo <<= 2;

root <<= 1;

long testDiv = (root << 1) + 1;

if (remHi >= testDiv) {

remHi -= testDiv;

root++;

}

} while (count-- != 0);

return root;

}

public static double hypot(double x, double y) {

return Math.sqrt(x * x + y * y);

}

public static int hypot(int x, int y) {

return (int) ((lsqrt((long) x * x + (long) y * y) + 128) >> 8);

}

public static long hypot(long x, long y) {

return (lsqrt(x * x + y * y) + 128) >> 8;

}

static int FloatToS15_16(float flt) {

flt = flt * 65536f + 0.5f;

if (flt <= -(65536f * 65536f)) {

return Integer.MIN_VALUE;

} else if (flt >= (65536f * 65536f)) {

return Integer.MAX_VALUE;

} else {

return (int) Math.floor(flt);

}

static float S15_16ToFloat(int fix) {

return (fix / 65536f);

}

processing/core/src/processing/opengl/LinePath.java at master · 2php/processing · GitHub

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