105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.keyboard.internal;
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import android.graphics.Path;
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import android.graphics.RectF;
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public final class RoundedLine {
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// Start point (P1) coordinates and trail radius.
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public float p1x, p1y;
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public float r1;
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// End point (P2) coordinates and trail radius.
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public float p2x, p2y;
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public float r2;
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// Closing point of arc at P1.
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private float p1ax, p1ay;
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// Opening point of arc at P1.
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private float p1bx, p1by;
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// Opening point of arc at P2.
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private float p2ax, p2ay;
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// Closing point of arc at P2.
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private float p2bx, p2by;
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// Start angle of the trail arcs.
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private float angle;
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// Sweep angle of the trail arc at P1.
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private float a1;
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private final RectF arc1 = new RectF();
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// Sweep angle of the trail arc at P2.
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private float a2;
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private final RectF arc2 = new RectF();
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private final Path path = new Path();
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private static final float RADIAN_TO_DEGREE = (float)(180.0d / Math.PI);
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private static final float RIGHT_ANGLE = (float)(Math.PI / 2.0d);
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public Path makePath() {
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final float dx = p2x - p1x;
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final float dy = p2y - p1y;
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// Distance of the points.
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final double l = Math.hypot(dx, dy);
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if (Double.compare(0.0d, l) == 0) {
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return null;
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}
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// Angle of the line p1-p2
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final float a = (float)Math.atan2(dy, dx);
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// Difference of trail cap radius.
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final float dr = r2 - r1;
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// Variation of angle at trail cap.
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final float ar = (float)Math.asin(dr / l);
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// The start angle of trail cap arc at P1.
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final float aa = a - (RIGHT_ANGLE + ar);
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// The end angle of trail cap arc at P2.
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final float ab = a + (RIGHT_ANGLE + ar);
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final float cosa = (float)Math.cos(aa);
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final float sina = (float)Math.sin(aa);
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final float cosb = (float)Math.cos(ab);
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final float sinb = (float)Math.sin(ab);
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p1ax = p1x + r1 * cosa;
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p1ay = p1y + r1 * sina;
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p1bx = p1x + r1 * cosb;
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p1by = p1y + r1 * sinb;
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p2ax = p2x + r2 * cosa;
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p2ay = p2y + r2 * sina;
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p2bx = p2x + r2 * cosb;
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p2by = p2y + r2 * sinb;
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angle = aa * RADIAN_TO_DEGREE;
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final float ar2degree = ar * 2.0f * RADIAN_TO_DEGREE;
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a1 = -180.0f + ar2degree;
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a2 = 180.0f + ar2degree;
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arc1.set(p1x, p1y, p1x, p1y);
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arc1.inset(-r1, -r1);
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arc2.set(p2x, p2y, p2x, p2y);
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arc2.inset(-r2, -r2);
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path.rewind();
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// Trail cap at P1.
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path.moveTo(p1x, p1y);
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path.arcTo(arc1, angle, a1);
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// Trail cap at P2.
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path.moveTo(p2x, p2y);
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path.arcTo(arc2, angle, a2);
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// Two trapezoids connecting P1 and P2.
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path.moveTo(p1ax, p1ay);
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path.lineTo(p1x, p1y);
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path.lineTo(p1bx, p1by);
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path.lineTo(p2bx, p2by);
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path.lineTo(p2x, p2y);
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path.lineTo(p2ax, p2ay);
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path.close();
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return path;
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}
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}
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