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/*
* Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
* 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.marlin;
public final class PathSimplifier implements DPathConsumer2D {
// distance threshold in pixels (device)
private static final double PIX_THRESHOLD = MarlinProperties.getPathSimplifierPixelTolerance();
// squared tolerance in pixels
private static final double SQUARE_TOLERANCE = PIX_THRESHOLD * PIX_THRESHOLD;
// members:
private DPathConsumer2D delegate;
// current reference point
private double cx, cy;
// flag indicating if the given point was skipped
private boolean skipped;
// last skipped point
private double sx, sy;
PathSimplifier() {
}
public PathSimplifier init(final DPathConsumer2D delegate) {
this.delegate = delegate;
skipped = false;
return this; // fluent API
}
private void finishPath() {
if (skipped) {
_lineTo(sx, sy);
}
}
@Override
public void pathDone() {
finishPath();
delegate.pathDone();
}
@Override
public void closePath() {
finishPath();
delegate.closePath();
}
@Override
public void moveTo(final double xe, final double ye) {
finishPath();
delegate.moveTo(xe, ye);
cx = xe;
cy = ye;
}
@Override
public void lineTo(final double xe, final double ye) {
// Test if segment is too small:
double dx = (xe - cx);
double dy = (ye - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
skipped = true;
sx = xe;
sy = ye;
return;
}
_lineTo(xe, ye);
}
private void _lineTo(final double xe, final double ye) {
delegate.lineTo(xe, ye);
cx = xe;
cy = ye;
skipped = false;
}
@Override
public void quadTo(final double x1, final double y1,
final double xe, final double ye)
{
// Test if curve is too small:
double dx = (xe - cx);
double dy = (ye - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
// check control points P1:
dx = (x1 - cx);
dy = (y1 - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
skipped = true;
sx = xe;
sy = ye;
return;
}
}
delegate.quadTo(x1, y1, xe, ye);
cx = xe;
cy = ye;
skipped = false;
}
@Override
public void curveTo(final double x1, final double y1,
final double x2, final double y2,
final double xe, final double ye)
{
// Test if curve is too small:
double dx = (xe - cx);
double dy = (ye - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
// check control points P1:
dx = (x1 - cx);
dy = (y1 - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
// check control points P2:
dx = (x2 - cx);
dy = (y2 - cy);
if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {
skipped = true;
sx = xe;
sy = ye;
return;
}
}
}
delegate.curveTo(x1, y1, x2, y2, xe, ye);
cx = xe;
cy = ye;
skipped = false;
}
}
