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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: canvastools.cxx,v $
+ * $Revision: 1.12 $
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org 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 Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+// MARKER(update_precomp.py): autogen include statement, do not remove
+#include "precompiled_basegfx.hxx"
+
+#include <basegfx/tools/gradienttools.hxx>
+
+#include <basegfx/point/b2dpoint.hxx>
+#include <basegfx/range/b2drange.hxx>
+
+namespace basegfx
+{
+ /** Most of the setup for linear & axial gradient is the same, except
+ for the border treatment. Factored out here.
+ */
+ static void init1DGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetRange,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle,
+ bool bAxial)
+ {
+ o_rGradientInfo.maTextureTransform.identity();
+ o_rGradientInfo.maBackTextureTransform.identity();
+ o_rGradientInfo.mnSteps = nSteps;
+
+ double fTargetSizeX(rTargetRange.getWidth());
+ double fTargetSizeY(rTargetRange.getHeight());
+ double fTargetOffsetX(rTargetRange.getMinX());
+ double fTargetOffsetY(rTargetRange.getMinY());
+
+ // add object expansion
+ if(0.0 != fAngle)
+ {
+ const double fAbsCos(fabs(cos(fAngle)));
+ const double fAbsSin(fabs(sin(fAngle)));
+ const double fNewX(fTargetSizeX * fAbsCos + fTargetSizeY * fAbsSin);
+ const double fNewY(fTargetSizeY * fAbsCos + fTargetSizeX * fAbsSin);
+ fTargetOffsetX -= (fNewX - fTargetSizeX) / 2.0;
+ fTargetOffsetY -= (fNewY - fTargetSizeY) / 2.0;
+ fTargetSizeX = fNewX;
+ fTargetSizeY = fNewY;
+ }
+
+ // add object scale before rotate
+ o_rGradientInfo.maTextureTransform.scale(fTargetSizeX, fTargetSizeY);
+
+ // add texture rotate after scale to keep perpendicular angles
+ if(0.0 != fAngle)
+ {
+ B2DPoint aCenter(0.5, 0.5);
+ aCenter *= o_rGradientInfo.maTextureTransform;
+
+ o_rGradientInfo.maTextureTransform.translate(-aCenter.getX(), -aCenter.getY());
+ o_rGradientInfo.maTextureTransform.rotate(fAngle);
+ o_rGradientInfo.maTextureTransform.translate(aCenter.getX(), aCenter.getY());
+ }
+
+ // add object translate
+ o_rGradientInfo.maTextureTransform.translate(fTargetOffsetX, fTargetOffsetY);
+
+ // prepare aspect for texture
+ o_rGradientInfo.mfAspectRatio = (0.0 != fTargetSizeY) ? fTargetSizeX / fTargetSizeY : 1.0;
+
+ // build transform from u,v to [0.0 .. 1.0]. As base, use inverse texture transform
+ o_rGradientInfo.maBackTextureTransform = o_rGradientInfo.maTextureTransform;
+ o_rGradientInfo.maBackTextureTransform.invert();
+
+ double fSizeWithoutBorder=0;
+ if( bAxial )
+ {
+ fSizeWithoutBorder = (1.0 - fBorder) * 0.5;
+ o_rGradientInfo.maBackTextureTransform.translate(0.0, -0.5);
+ }
+ else
+ {
+ fSizeWithoutBorder = 1.0 - fBorder;
+ o_rGradientInfo.maBackTextureTransform.translate(0.0, -fBorder);
+ }
+
+ if(!fTools::equal(fSizeWithoutBorder, 0.0))
+ o_rGradientInfo.maBackTextureTransform.scale(1.0, 1.0 / fSizeWithoutBorder);
+ }
+
+ /** Most of the setup for radial & ellipsoidal gradient is the same,
+ except for the border treatment. Factored out here.
+ */
+ static void initEllipticalGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetRange,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle,
+ bool bCircular)
+ {
+ o_rGradientInfo.maTextureTransform.identity();
+ o_rGradientInfo.maBackTextureTransform.identity();
+ o_rGradientInfo.mnSteps = nSteps;
+
+ double fTargetSizeX(rTargetRange.getWidth());
+ double fTargetSizeY(rTargetRange.getHeight());
+ double fTargetOffsetX(rTargetRange.getMinX());
+ double fTargetOffsetY(rTargetRange.getMinY());
+
+ // add object expansion
+ if( bCircular )
+ {
+ const double fOriginalDiag(sqrt((fTargetSizeX * fTargetSizeX) + (fTargetSizeY * fTargetSizeY)));
+ fTargetOffsetX -= (fOriginalDiag - fTargetSizeX) / 2.0;
+ fTargetOffsetY -= (fOriginalDiag - fTargetSizeY) / 2.0;
+ fTargetSizeX = fOriginalDiag;
+ fTargetSizeY = fOriginalDiag;
+ }
+ else
+ {
+ fTargetOffsetX -= (0.4142 / 2.0 ) * fTargetSizeX;
+ fTargetOffsetY -= (0.4142 / 2.0 ) * fTargetSizeY;
+ fTargetSizeX = 1.4142 * fTargetSizeX;
+ fTargetSizeY = 1.4142 * fTargetSizeY;
+ }
+
+ // add object scale before rotate
+ o_rGradientInfo.maTextureTransform.scale(fTargetSizeX, fTargetSizeY);
+
+ if( !bCircular )
+ {
+ // add texture rotate after scale to keep perpendicular angles
+ if(0.0 != fAngle)
+ {
+ B2DPoint aCenter(0.5, 0.5);
+ aCenter *= o_rGradientInfo.maTextureTransform;
+
+ o_rGradientInfo.maTextureTransform.translate(-aCenter.getX(), -aCenter.getY());
+ o_rGradientInfo.maTextureTransform.rotate(fAngle);
+ o_rGradientInfo.maTextureTransform.translate(aCenter.getX(), aCenter.getY());
+ }
+ }
+
+ // add defined offsets after rotation
+ if(0.5 != rOffset.getX() || 0.5 != rOffset.getY())
+ {
+ // use original target size
+ fTargetOffsetX += (rOffset.getX() - 0.5) * rTargetRange.getWidth();
+ fTargetOffsetY += (rOffset.getY() - 0.5) * rTargetRange.getHeight();
+ }
+
+ // add object translate
+ o_rGradientInfo.maTextureTransform.translate(fTargetOffsetX, fTargetOffsetY);
+
+ // prepare aspect for texture
+ o_rGradientInfo.mfAspectRatio = (0.0 != fTargetSizeY) ? fTargetSizeX / fTargetSizeY : 1.0;
+
+ // build transform from u,v to [0.0 .. 1.0]. As base, use inverse texture transform
+ o_rGradientInfo.maBackTextureTransform = o_rGradientInfo.maTextureTransform;
+ o_rGradientInfo.maBackTextureTransform.invert();
+ o_rGradientInfo.maBackTextureTransform.translate(-0.5, -0.5);
+ const double fHalfBorder((1.0 - fBorder) * 0.5);
+
+ if(!fTools::equal(fHalfBorder, 0.0))
+ {
+ const double fFactor(1.0 / fHalfBorder);
+ o_rGradientInfo.maBackTextureTransform.scale(fFactor, fFactor);
+ }
+ }
+
+ /** Setup for rect & square gradient is exactly the same. Factored out
+ here.
+ */
+ static void initRectGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetRange,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ o_rGradientInfo.maTextureTransform.identity();
+ o_rGradientInfo.maBackTextureTransform.identity();
+ o_rGradientInfo.mnSteps = nSteps;
+
+ double fTargetSizeX(rTargetRange.getWidth());
+ double fTargetSizeY(rTargetRange.getHeight());
+ double fTargetOffsetX(rTargetRange.getMinX());
+ double fTargetOffsetY(rTargetRange.getMinY());
+
+ // add object expansion
+ if(0.0 != fAngle)
+ {
+ const double fAbsCos(fabs(cos(fAngle)));
+ const double fAbsSin(fabs(sin(fAngle)));
+ const double fNewX(fTargetSizeX * fAbsCos + fTargetSizeY * fAbsSin);
+ const double fNewY(fTargetSizeY * fAbsCos + fTargetSizeX * fAbsSin);
+ fTargetOffsetX -= (fNewX - fTargetSizeX) / 2.0;
+ fTargetOffsetY -= (fNewY - fTargetSizeY) / 2.0;
+ fTargetSizeX = fNewX;
+ fTargetSizeY = fNewY;
+ }
+
+ // add object scale before rotate
+ o_rGradientInfo.maTextureTransform.scale(fTargetSizeX, fTargetSizeY);
+
+ // add texture rotate after scale to keep perpendicular angles
+ if(0.0 != fAngle)
+ {
+ B2DPoint aCenter(0.5, 0.5);
+ aCenter *= o_rGradientInfo.maTextureTransform;
+
+ o_rGradientInfo.maTextureTransform.translate(-aCenter.getX(), -aCenter.getY());
+ o_rGradientInfo.maTextureTransform.rotate(fAngle);
+ o_rGradientInfo.maTextureTransform.translate(aCenter.getX(), aCenter.getY());
+ }
+
+ // add defined offsets after rotation
+ if(0.5 != rOffset.getX() || 0.5 != rOffset.getY())
+ {
+ // use scaled target size
+ fTargetOffsetX += (rOffset.getX() - 0.5) * fTargetSizeX;
+ fTargetOffsetY += (rOffset.getY() - 0.5) * fTargetSizeY;
+ }
+
+ // add object translate
+ o_rGradientInfo.maTextureTransform.translate(fTargetOffsetX, fTargetOffsetY);
+
+ // prepare aspect for texture
+ o_rGradientInfo.mfAspectRatio = (0.0 != fTargetSizeY) ? fTargetSizeX / fTargetSizeY : 1.0;
+
+ // build transform from u,v to [0.0 .. 1.0]. As base, use inverse texture transform
+ o_rGradientInfo.maBackTextureTransform = o_rGradientInfo.maTextureTransform;
+ o_rGradientInfo.maBackTextureTransform.invert();
+ o_rGradientInfo.maBackTextureTransform.translate(-0.5, -0.5);
+ const double fHalfBorder((1.0 - fBorder) * 0.5);
+
+ if(!fTools::equal(fHalfBorder, 0.0))
+ {
+ const double fFactor(1.0 / fHalfBorder);
+ o_rGradientInfo.maBackTextureTransform.scale(fFactor, fFactor);
+ }
+ }
+
+ namespace tools
+ {
+ ODFGradientInfo& createLinearODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ init1DGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ nSteps,
+ fBorder,
+ fAngle,
+ false);
+ return o_rGradientInfo;
+ }
+
+ ODFGradientInfo& createAxialODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ init1DGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ nSteps,
+ fBorder,
+ fAngle,
+ true);
+ return o_rGradientInfo;
+ }
+
+ ODFGradientInfo& createRadialODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder)
+ {
+ initEllipticalGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ rOffset,
+ nSteps,
+ fBorder,
+ 0.0,
+ true);
+ return o_rGradientInfo;
+ }
+
+ ODFGradientInfo& createEllipticalODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ initEllipticalGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ rOffset,
+ nSteps,
+ fBorder,
+ fAngle,
+ false);
+ return o_rGradientInfo;
+ }
+
+ ODFGradientInfo& createSquareODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ initRectGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ rOffset,
+ nSteps,
+ fBorder,
+ fAngle);
+ return o_rGradientInfo;
+ }
+
+ ODFGradientInfo& createRectangularODFGradientInfo(ODFGradientInfo& o_rGradientInfo,
+ const B2DRange& rTargetArea,
+ const B2DVector& rOffset,
+ sal_uInt32 nSteps,
+ double fBorder,
+ double fAngle)
+ {
+ initRectGradientInfo(o_rGradientInfo,
+ rTargetArea,
+ rOffset,
+ nSteps,
+ fBorder,
+ fAngle);
+ return o_rGradientInfo;
+ }
+
+ } // namespace tools
+
+} // namespace basegfx