/* Copyright (C) 2007, 2010 - Bit-Blot This file is part of Aquaria. Aquaria is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "QuadTrail.h" #include QuadTrail::QuadTrail(int maxPoints, float pointDist) : RenderObject() , numPoints(0) , maxPoints(maxPoints) , pointDist(pointDist) { quadTrailAlphaEffect = QTAE_NORMAL; cull = false; repeatTexture = 1; lifeRate = 0.5; } void QuadTrail::addPoint(const Vector &point) { if (numPoints > 0) { if ((points.back().point - point).isLength2DIn(pointDist)) { backOffset = point - points.back().point; return; } } QuadTrailPoint p; p.point = point; points.push_back(p); numPoints++; if (numPoints >= maxPoints) points.pop_front(); backOffset.x = 0; backOffset.y = 0; } void QuadTrail::onRender() { if (numPoints < 2) return; int c = 0; Vector p, diff, dl, dr; Vector lastPoint; const float texScale = texture ? float(numPoints*pointDist)/texture->width : 1.0f; glBegin(GL_QUAD_STRIP); for (Points::iterator i = points.begin(); i != points.end(); i++) { if (quadTrailAlphaEffect == QTAE_NORMAL) { glColor4f(1, 1, 1, (*i).life); } if (c == 0) { lastPoint = (*i).point; c++; continue; } p = (*i).point; if (c == numPoints-1) p += backOffset; diff = p - lastPoint; //possible opt here if (texture) diff.setLength2D(texture->width*0.5f); else diff.setLength2D(32); dl = diff.getPerpendicularLeft(); dr = diff.getPerpendicularRight(); glTexCoord2f(0, (float(c)/numPoints)*texScale); glVertex2f(p.x+dl.x, p.y+dl.y); glTexCoord2f(1, (float(c+1)/numPoints)*texScale); glVertex2f(p.x+dr.x, p.y+dr.y); c++; lastPoint = (*i).point; } glEnd(); glBindTexture(GL_TEXTURE_2D, 0); glPointSize(4); glColor4f(0, 1, 0, 0.5); glBegin(GL_POINTS); for (Points::iterator i = points.begin(); i != points.end(); i++) { glVertex2f((*i).point.x, (*i).point.y); } glEnd(); } void QuadTrail::onUpdate(float dt) { RenderObject::onUpdate(dt); for (Points::iterator i = points.begin(); i != points.end(); i++) { (*i).life -= dt * lifeRate; if ((*i).life <= 0) (*i).life = 0; } }