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Diffstat (limited to 'kolourpaint/widgets/kpcolorsimilaritycube.cpp')
| -rw-r--r-- | kolourpaint/widgets/kpcolorsimilaritycube.cpp | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/kolourpaint/widgets/kpcolorsimilaritycube.cpp b/kolourpaint/widgets/kpcolorsimilaritycube.cpp new file mode 100644 index 00000000..9fe3f29b --- /dev/null +++ b/kolourpaint/widgets/kpcolorsimilaritycube.cpp @@ -0,0 +1,348 @@ + +/* + Copyright (c) 2003,2004,2005 Clarence Dang <dang@kde.org> + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#define DEBUG_KP_COLOR_SIMILARITY_CUBE 0 + + +#include <kpcolorsimilaritycube.h> + +#include <math.h> + +#include <qpainter.h> +#include <qpixmap.h> +#include <qwhatsthis.h> + +#include <kdebug.h> +#include <klocale.h> + +#include <kpcolor.h> +#include <kpcolorsimilaritydialog.h> +#include <kpdefs.h> + + +const double kpColorSimilarityCube::colorCubeDiagonalDistance = + sqrt (255 * 255 * 3); + +kpColorSimilarityCube::kpColorSimilarityCube (int look, + kpMainWindow *mainWindow, + QWidget *parent, + const char *name) + : QFrame (parent, name, Qt::WNoAutoErase/*no flicker*/), + m_mainWindow (mainWindow), + m_colorSimilarity (-1) +{ + if (look & Depressed) + setFrameStyle (QFrame::Panel | QFrame::Sunken); + + setColorSimilarity (0); + + + // Don't cause the translators grief by appending strings + // - duplicate text with 2 cases + + if (look & DoubleClickInstructions) + { + QWhatsThis::add (this, + i18n ("<qt><p><b>Color Similarity</b> is how close " + "colors must be in the RGB Color Cube " + "to be considered the same.</p>" + + "<p>If you set it to something " + "other than <b>Exact</b>, " + "you can work more effectively with dithered " + "images and photos.</p>" + + "<p>This feature applies to transparent selections, as well as " + "the Flood Fill, Color Eraser and Autocrop " + "tools.</p>" + + // sync: different to else case + "<p>To configure it, double click on the cube.</p>" + + "</qt>")); + } + else + { + QWhatsThis::add (this, + i18n ("<qt><p><b>Color Similarity</b> is how close " + "colors must be in the RGB Color Cube " + "to be considered the same.</p>" + + "<p>If you set it to something " + "other than <b>Exact</b>, " + "you can work more effectively with dithered " + "images and photos.</p>" + + "<p>This feature applies to transparent selections, as well as " + "the Flood Fill, Color Eraser and Autocrop " + "tools.</p>" + + "</qt>")); + } +} + +kpColorSimilarityCube::~kpColorSimilarityCube () +{ +} + + +// public +double kpColorSimilarityCube::colorSimilarity () const +{ + return m_colorSimilarity; +} + +// public +void kpColorSimilarityCube::setColorSimilarity (double similarity) +{ +#if DEBUG_KP_COLOR_SIMILARITY_CUBE + kdDebug () << "kpColorSimilarityCube::setColorSimilarity(" << similarity << ")" << endl; +#endif + + if (m_colorSimilarity == similarity) + return; + + if (similarity < 0) + similarity = 0; + else if (similarity > kpColorSimilarityDialog::maximumColorSimilarity) + similarity = kpColorSimilarityDialog::maximumColorSimilarity; + + m_colorSimilarity = similarity; + + repaint (false/*no erase*/); +} + + +// protected virtual [base QWidget] +QSize kpColorSimilarityCube::sizeHint () const +{ + return QSize (52, 52); +} + + +// protected +QColor kpColorSimilarityCube::color (int redOrGreenOrBlue, + int baseBrightness, + int similarityDirection) const +{ + int brightness = int (baseBrightness + + similarityDirection * + .5 * m_colorSimilarity * kpColorSimilarityCube::colorCubeDiagonalDistance); + + if (brightness < 0) + brightness = 0; + else if (brightness > 255) + brightness = 255; + + switch (redOrGreenOrBlue) + { + default: + case 0: return QColor (brightness, 0, 0); + case 1: return QColor (0, brightness, 0); + case 2: return QColor (0, 0, brightness); + } +} + +static QPoint pointBetween (const QPoint &p, const QPoint &q) +{ + return QPoint ((p.x () + q.x ()) / 2, (p.y () + q.y ()) / 2); +} + +static void drawQuadrant (QPainter *p, + const QColor &col, + const QPoint &p1, const QPoint &p2, const QPoint &p3, + const QPoint pointNotOnOutline) +{ + p->save (); + + + QPointArray points (4); + points [0] = p1; + points [1] = p2; + points [2] = p3; + points [3] = pointNotOnOutline; + + p->setPen (col); + p->setBrush (col); + p->drawPolygon (points); + + + points.resize (3); + + p->setPen (Qt::black); + p->setBrush (Qt::NoBrush); + p->drawPolyline (points); + + + p->restore (); +} + +// protected +void kpColorSimilarityCube::drawFace (QPainter *p, + int redOrGreenOrBlue, + const QPoint &tl, const QPoint &tr, + const QPoint &bl, const QPoint &br) +{ +#if DEBUG_KP_COLOR_SIMILARITY_CUBE + kdDebug () << "kpColorSimilarityCube(RorGorB=" << redOrGreenOrBlue + << ",tl=" << tl + << ",tr=" << tr + << ",bl=" << bl + << ",br=" << br + << ")" + << endl; +#endif + + // tl --- tm --- tr + // | | | + // | | | + // ml --- mm --- mr + // | | | + // | | | + // bl --- bm --- br + + const QPoint tm (::pointBetween (tl, tr)); + const QPoint bm (::pointBetween (bl, br)); + + const QPoint ml (::pointBetween (tl, bl)); + const QPoint mr (::pointBetween (tr, br)); + const QPoint mm (::pointBetween (ml, mr)); + + + const int baseBrightness = QMAX (127, + 255 - int (kpColorSimilarityDialog::maximumColorSimilarity * + kpColorSimilarityCube::colorCubeDiagonalDistance / 2)); + QColor colors [2] = + { + color (redOrGreenOrBlue, baseBrightness, -1), + color (redOrGreenOrBlue, baseBrightness, +1) + }; + + if (!isEnabled ()) + { + #if DEBUG_KP_COLOR_SIMILARITY_CUBE + kdDebug () << "\tnot enabled - making us grey" << endl; + #endif + colors [0] = colorGroup ().background (); + colors [1] = colorGroup ().background (); + } + +#if DEBUG_KP_COLOR_SIMILARITY_CUBE + kdDebug () << "\tmaxColorSimilarity=" << kpColorSimilarityDialog::maximumColorSimilarity + << " colorCubeDiagDist=" << kpColorSimilarityCube::colorCubeDiagonalDistance + << endl + << "\tbaseBrightness=" << baseBrightness + << " color[0]=" << ((colors [0].rgb () & RGB_MASK) >> ((2 - redOrGreenOrBlue) * 8)) + << " color[1]=" << ((colors [1].rgb () & RGB_MASK) >> ((2 - redOrGreenOrBlue) * 8)) + << endl; +#endif + + + ::drawQuadrant (p, colors [0], tm, tl, ml, mm); + ::drawQuadrant (p, colors [1], tm, tr, mr, mm); + ::drawQuadrant (p, colors [1], ml, bl, bm, mm); + ::drawQuadrant (p, colors [0], bm, br, mr, mm); +} + +// protected virtual [base QFrame] +void kpColorSimilarityCube::drawContents (QPainter *p) +{ + QRect cr (contentsRect ()); + + QPixmap backBuffer (cr.width (), cr.height ()); + backBuffer.fill (colorGroup ().background ()); + + QPainter backBufferPainter (&backBuffer); + + int cubeRectSize = QMIN (cr.width () * 6 / 8, cr.height () * 6 / 8); + int dx = (cr.width () - cubeRectSize) / 2, + dy = (cr.height () - cubeRectSize) / 2; + backBufferPainter.translate (dx, dy); + + // + // P------- Q --- --- + // / / | | | + // /A / | side | + // R-------S T --- cubeRectSize + // | | / / | + // S | | / side | + // U-------V --- --- + // |-------| + // side + // |-----------| + // cubeRectSize + // + // + + const double angle = KP_DEGREES_TO_RADIANS (45); + // S + S sin A = cubeRectSize + // (1 + sin A) x S = cubeRectSize + const double side = double (cubeRectSize) / (1 + sin (angle)); + + + const QPoint pointP ((int) (side * cos (angle)), 0); + const QPoint pointQ ((int) (side * cos (angle) + side), 0); + const QPoint pointR (0, (int) (side * sin (angle))); + const QPoint pointS ((int) (side), (int) (side * sin (angle))); + const QPoint pointU (0, (int) (side * sin (angle) + side)); + const QPoint pointT ((int) (side + side * cos (angle)), (int) (side)); + const QPoint pointV ((int) (side), (int) (side * sin (angle) + side)); + + + // Top Face + drawFace (&backBufferPainter, + 0/*red*/, + pointP, pointQ, + pointR, pointS); + + + // Bottom Face + drawFace (&backBufferPainter, + 1/*green*/, + pointR, pointS, + pointU, pointV); + + + // Right Face + drawFace (&backBufferPainter, + 2/*blue*/, + pointS, pointQ, + pointV, pointT); + + +#if 0 + backBufferPainter.save (); + backBufferPainter.setPen (Qt::cyan); + backBufferPainter.drawRect (0, 0, cubeRectSize, cubeRectSize); + backBufferPainter.restore (); +#endif + + + backBufferPainter.end (); + + p->drawPixmap (cr, backBuffer); +} |