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69 lines
1.4 KiB
69 lines
1.4 KiB
/*
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* Copyright (C) 2013 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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#include "Vector2D.h"
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#include <math.h>
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Vector2D::Vector2D() :
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mX(0), mY(0) {
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}
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Vector2D::Vector2D(float x, float y) :
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mX(x), mY(y) {
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}
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Vector2D Vector2D::copy() {
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Vector2D v(mX, mY);
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return v;
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}
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void Vector2D::add(const Vector2D& v) {
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mX += v.mX;
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mY += v.mY;
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}
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void Vector2D::sub(const Vector2D& v) {
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mX -= v.mX;
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mY -= v.mY;
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}
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void Vector2D::scale(float s) {
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mX *= s;
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mY *= s;
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}
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float Vector2D::distance(const Vector2D& v) {
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float dx = mX - v.mX;
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float dy = mY - v.mY;
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return (float) sqrt(dx * dx + dy * dy);
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}
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void Vector2D::normalize() {
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float m = magnitude();
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if (m > 0) {
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scale(1 / m);
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}
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}
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void Vector2D::limit(float max) {
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if (magnitude() > max) {
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normalize();
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scale(max);
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}
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}
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float Vector2D::magnitude() {
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return (float) sqrt(mX * mX + mY * mY);
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}
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