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diff --git a/src/expand-piecewise.cpp b/src/expand-piecewise.cpp
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+/*
+ * Animation plugin for compiz/beryl
+ *
+ * animation.c
+ *
+ * Copyright : (C) 2006 Erkin Bahceci
+ * E-mail : erkinbah@gmail.com
+ *
+ * Based on Wobbly and Minimize plugins by
+ * : David Reveman
+ * E-mail : davidr@novell.com>
+ *
+ * Particle system added by : (C) 2006 Dennis Kasprzyk
+ * E-mail : onestone@beryl-project.org
+ *
+ * Beam-Up added by : Florencio Guimaraes
+ * E-mail : florencio@nexcorp.com.br
+ *
+ * Hexagon tessellator added by : Mike Slegeir
+ * E-mail : mikeslegeir@mail.utexas.edu>
+ *
+ * This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "animationsim.h"
+#define DELTA 0.0001f
+
+// ===================== Effect: ExpandPW =========================
+
+void
+ExpandPWAnim::applyTransform ()
+{
+ ANIMSIM_SCREEN (screen);
+
+ GLMatrix *transform = &mTransform;
+
+ float forwardProgress = 1.0f - getProgress ();
+
+ float initialXScale = ass->optionGetExpandpwInitialHoriz () / (float) mWindow->width ();
+ float initialYScale = ass->optionGetExpandpwInitialVert () / (float) mWindow->height ();
+
+ // animation movement
+ transform->translate (WIN_X (mWindow) + WIN_W (mWindow) / 2.0f,
+ WIN_Y (mWindow) + WIN_H (mWindow) / 2.0f,
+ 0.0f);
+
+ float xScale;
+ float yScale;
+ float switchPointP;
+ float switchPointN;
+ float delay = ass->optionGetExpandpwDelay ();
+
+ if (ass->optionGetExpandpwHorizFirst ())
+ {
+ switchPointP = mWindow->width () / (float) (mWindow->width () + mWindow->height ()) + mWindow->height () / (float) (mWindow->width () + mWindow->height ()) * delay;
+ switchPointN = mWindow->width () / (float) (mWindow->width () + mWindow->height ()) - mWindow->width () / (float) (mWindow->width () + mWindow->height ()) * delay;
+ if(switchPointP >= 1.0f) switchPointP = 1.0f - DELTA;
+ if(switchPointN <= 0.0f) switchPointN = 0.0f + DELTA;
+ xScale = initialXScale + (1.0f - initialXScale) * (forwardProgress < switchPointN ? 1.0f - (switchPointN - forwardProgress)/switchPointN : 1.0f);
+ yScale = initialYScale + (1.0f - initialYScale) * (forwardProgress > switchPointP ? (forwardProgress - switchPointP)/(1.0f-switchPointP) : 0.0f);
+ }
+ else
+ {
+ switchPointP = mWindow->height () / (float) (mWindow->width () + mWindow->height ()) + mWindow->width () / (float) (mWindow->width () + mWindow->height ()) * delay;
+ switchPointN = mWindow->height () / (float) (mWindow->width () + mWindow->height ()) - mWindow->height () / (float) (mWindow->width () + mWindow->height ()) * delay;
+ if(switchPointP >= 1.0f) switchPointP = 1.0f - DELTA;
+ if(switchPointN <= 0.0f) switchPointN = 0.0f + DELTA;
+ xScale = initialXScale + (1.0f - initialXScale) * (forwardProgress > switchPointP ? (forwardProgress - switchPointP)/(1.0f-switchPointP) : 0.0f);
+ yScale = initialYScale + (1.0f - initialYScale) * (forwardProgress < switchPointN ? 1.0f - (switchPointN - forwardProgress)/switchPointN : 1.0f);
+ }
+
+ transform->scale (xScale, yScale, 0.0f);
+
+ transform->translate (-(WIN_X (mWindow) + WIN_W (mWindow) / 2.0f),
+ -(WIN_Y (mWindow) + WIN_H (mWindow) / 2.0f),
+ 0.0f);
+
+}