98 lines
2.5 KiB
Java
98 lines
2.5 KiB
Java
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/*
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* opsu! - an open-source osu! client
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* Copyright (C) 2014, 2015 Jeffrey Han
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*
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* opsu! is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* opsu! is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with opsu!. If not, see <http://www.gnu.org/licenses/>.
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*/
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package itdelatrisu.opsu.objects.curves;
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import itdelatrisu.opsu.OsuHitObject;
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import org.newdawn.slick.Color;
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/**
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* Representation of a curve.
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*/
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public abstract class Curve {
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/** The associated OsuHitObject. */
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protected OsuHitObject hitObject;
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/** The color of this curve. */
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protected Color color;
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/**
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* Constructor.
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* @param hitObject the associated OsuHitObject
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* @param color the color of this curve
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*/
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protected Curve(OsuHitObject hitObject, Color color) {
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this.hitObject = hitObject;
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this.color = color;
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}
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/**
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* Returns the point on the curve at a value t.
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* @param t the t value [0, 1]
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* @return the point [x, y]
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*/
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public abstract float[] pointAt(float t);
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/**
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* Draws the full curve to the graphics context.
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*/
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public abstract void draw();
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/**
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* Returns the angle of the first control point.
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*/
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public abstract float getEndAngle();
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/**
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* Returns the angle of the last control point.
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*/
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public abstract float getStartAngle();
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/**
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* Returns the x coordinate of the control point at index i.
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*/
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protected float getX(int i) {
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return (i == 0) ? hitObject.getX() : hitObject.getSliderX()[i - 1];
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}
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/**
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* Returns the y coordinate of the control point at index i.
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*/
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protected float getY(int i) {
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return (i == 0) ? hitObject.getY() : hitObject.getSliderY()[i - 1];
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}
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/**
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* Linear interpolation of a and b at t.
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*/
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protected float lerp(float a, float b, float t) {
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return a * (1 - t) + b * t;
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}
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/**
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* A recursive method to evaluate polynomials in Bernstein form or Bezier curves.
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* http://en.wikipedia.org/wiki/De_Casteljau%27s_algorithm
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*/
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protected float deCasteljau(float[] a, int i, int order, float t) {
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if (order == 0)
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return a[i];
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return lerp(deCasteljau(a, i, order - 1, t), deCasteljau(a, i + 1, order - 1, t), t);
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}
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}
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