79 lines
2.4 KiB
Java
Executable File
79 lines
2.4 KiB
Java
Executable File
/*
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* Copyright (c) 2012 Jason Polites
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.sf.andpdf.utils;
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import android.graphics.PointF;
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import android.util.FloatMath;
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import android.view.MotionEvent;
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public class MathUtils {
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public static float distance(MotionEvent event) {
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float x = event.getX(0) - event.getX(1);
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float y = event.getY(0) - event.getY(1);
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return FloatMath.sqrt(x * x + y * y);
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}
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public static float distance(PointF p1, PointF p2) {
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float x = p1.x - p2.x;
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float y = p1.y - p2.y;
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return FloatMath.sqrt(x * x + y * y);
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}
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public static float distance(float x1, float y1, float x2, float y2) {
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float x = x1 - x2;
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float y = y1 - y2;
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return FloatMath.sqrt(x * x + y * y);
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}
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public static void midpoint(MotionEvent event, PointF point) {
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float x1 = event.getX(0);
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float y1 = event.getY(0);
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float x2 = event.getX(1);
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float y2 = event.getY(1);
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midpoint(x1, y1, x2, y2, point);
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}
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public static void midpoint(float x1, float y1, float x2, float y2, PointF point) {
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point.x = (x1 + x2) / 2.0f;
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point.y = (y1 + y2) / 2.0f;
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}
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/**
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* Rotates p1 around p2 by angle degrees.
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*
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* @param p1
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* @param p2
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* @param angle
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*/
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public void rotate(PointF p1, PointF p2, float angle) {
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float px = p1.x;
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float py = p1.y;
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float ox = p2.x;
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float oy = p2.y;
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p1.x = (FloatMath.cos(angle) * (px - ox) - FloatMath.sin(angle) * (py - oy) + ox);
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p1.y = (FloatMath.sin(angle) * (px - ox) + FloatMath.cos(angle) * (py - oy) + oy);
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}
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public static float angle(PointF p1, PointF p2) {
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return angle(p1.x, p1.y, p2.x, p2.y);
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}
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public static float angle(float x1, float y1, float x2, float y2) {
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return (float) Math.atan2(y2 - y1, x2 - x1);
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}
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}
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