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-rw-r--r--chalk/ui/kcurve.cpp450
1 files changed, 450 insertions, 0 deletions
diff --git a/chalk/ui/kcurve.cpp b/chalk/ui/kcurve.cpp
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+++ b/chalk/ui/kcurve.cpp
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+/* ============================================================
+ * Copyright 2004-2005 by Gilles Caulier
+ * Copyright 2005 by Casper Boemann (reworked to be generic)
+ *
+ * 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, 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.
+ *
+ * ============================================================ */
+
+// C++ includes.
+
+#include <cmath>
+#include <cstdlib>
+
+// TQt includes.
+
+#include <tqpixmap.h>
+#include <tqpainter.h>
+#include <tqpoint.h>
+#include <tqpen.h>
+#include <tqevent.h>
+#include <tqtimer.h>
+#include <tqrect.h>
+#include <tqfont.h>
+#include <tqfontmetrics.h>
+
+// KDE includes.
+
+#include <kdebug.h>
+#include <kcursor.h>
+#include <tdelocale.h>
+
+// Local includes.
+
+#include "kcurve.h"
+
+KCurve::KCurve(TQWidget *parent, const char *name, WFlags f)
+ : TQWidget(parent, name, f)
+{
+ m_grab_point = NULL;
+ m_readOnlyMode = false;
+ m_guideVisible = false;
+ m_dragging = false;
+ m_pix = NULL;
+
+ setMouseTracking(true);
+ setPaletteBackgroundColor(TQt::NoBackground);
+ setMinimumSize(150, 50);
+ TQPair<double,double> *p = new TQPair<double,double>;
+ p->first = 0.0; p->second=0.0;
+ m_points.append(p);
+ p = new TQPair<double,double>;
+ p->first = 1.0; p->second=1.0;
+ m_points.append(p);
+ m_points.setAutoDelete(true);
+ setFocusPolicy(TQ_StrongFocus);
+}
+
+KCurve::~KCurve()
+{
+ if (m_pix) delete m_pix;
+}
+
+void KCurve::reset(void)
+{
+ m_grab_point = NULL;
+ m_guideVisible = false;
+ repaint(false);
+}
+
+void KCurve::setCurveGuide(TQColor color)
+{
+ m_guideVisible = true;
+ m_colorGuide = color;
+ repaint(false);
+}
+
+void KCurve::setPixmap(TQPixmap pix)
+{
+ if (m_pix) delete m_pix;
+ m_pix = new TQPixmap(pix);
+ repaint(false);
+}
+
+void KCurve::keyPressEvent(TQKeyEvent *e)
+{
+ if(e->key() == TQt::Key_Delete || e->key() == TQt::Key_Backspace)
+ {
+ TQPair<double,double> *closest_point=NULL;
+ if(m_grab_point)
+ {
+ //first find closest point to get focus afterwards
+ TQPair<double,double> *p = m_points.first();
+ double distance = 1000; // just a big number
+ while(p)
+ {
+ if(p!=m_grab_point)
+ if (fabs (m_grab_point->first - p->first) < distance)
+ {
+ distance = fabs(m_grab_point->first - p->first);
+ closest_point = p;
+ }
+ p = m_points.next();
+ }
+ m_points.remove(m_grab_point);
+ }
+ m_grab_point = closest_point;
+ repaint(false);
+ }
+ else
+ TQWidget::keyPressEvent(e);
+}
+
+void KCurve::paintEvent(TQPaintEvent *)
+{
+ int x, y;
+ int wWidth = width();
+ int wHeight = height();
+
+ x = 0;
+ y = 0;
+
+ // Drawing selection or all histogram values.
+ // A TQPixmap is used for enable the double buffering.
+
+ TQPixmap pm(size());
+ TQPainter p1;
+ p1.begin(TQT_TQPAINTDEVICE(&pm), this);
+
+ // draw background
+ if(m_pix)
+ {
+ p1.scale(1.0*wWidth/m_pix->width(), 1.0*wHeight/m_pix->height());
+ p1.drawPixmap(0, 0, *m_pix);
+ p1.resetXForm();
+ }
+ else
+ pm.fill();
+
+ // Draw grid separators.
+ p1.setPen(TQPen(TQt::gray, 1, TQt::SolidLine));
+ p1.drawLine(wWidth/3, 0, wWidth/3, wHeight);
+ p1.drawLine(2*wWidth/3, 0, 2*wWidth/3, wHeight);
+ p1.drawLine(0, wHeight/3, wWidth, wHeight/3);
+ p1.drawLine(0, 2*wHeight/3, wWidth, 2*wHeight/3);
+
+ // Draw curve.
+ double curvePrevVal = getCurveValue(0.0);
+ p1.setPen(TQPen(TQt::black, 1, TQt::SolidLine));
+ for (x = 0 ; x < wWidth ; x++)
+ {
+ double curveX;
+ double curveVal;
+
+ curveX = (x + 0.5) / wWidth;
+
+ curveVal = getCurveValue(curveX);
+
+ p1.drawLine(x - 1, wHeight - int(curvePrevVal * wHeight),
+ x, wHeight - int(curveVal * wHeight));
+
+ curvePrevVal = curveVal;
+ }
+ p1.drawLine(x - 1, wHeight - int(curvePrevVal * wHeight),
+ x, wHeight - int(getCurveValue(1.0) * wHeight));
+
+ // Drawing curve handles.
+ if ( !m_readOnlyMode )
+ {
+ TQPair<double,double> *p = m_points.first();
+
+ while(p)
+ {
+ double curveX = p->first;
+ double curveY = p->second;
+
+ if(p == m_grab_point)
+ {
+ p1.setPen(TQPen(TQt::red, 3, TQt::SolidLine));
+ p1.drawEllipse( int(curveX * wWidth) - 2,
+ wHeight - 2 - int(curveY * wHeight), 4, 4 );
+ }
+ else
+ {
+ p1.setPen(TQPen(TQt::red, 1, TQt::SolidLine));
+
+ p1.drawEllipse( int(curveX * wWidth) - 3,
+ wHeight - 3 - int(curveY * wHeight), 6, 6 );
+ }
+
+ p = m_points.next();
+ }
+ }
+
+ p1.end();
+ bitBlt(this, 0, 0, &pm);
+}
+
+void KCurve::mousePressEvent ( TQMouseEvent * e )
+{
+ if (m_readOnlyMode) return;
+
+ TQPair<double,double> *closest_point=NULL;
+ double distance;
+
+ if (e->button() != Qt::LeftButton)
+ return;
+
+ double x = e->pos().x() / (float)width();
+ double y = 1.0 - e->pos().y() / (float)height();
+
+ distance = 1000; // just a big number
+
+ TQPair<double,double> *p = m_points.first();
+ int insert_pos,pos=0;
+ while(p)
+ {
+ if (fabs (x - p->first) < distance)
+ {
+ distance = fabs(x - p->first);
+ closest_point = p;
+ if(x < p->first)
+ insert_pos = pos;
+ else
+ insert_pos = pos + 1;
+ }
+ p = m_points.next();
+ pos++;
+ }
+
+
+ if(closest_point == NULL)
+ {
+ closest_point = new TQPair<double,double>;
+ closest_point->first = x;
+ closest_point->second = y;
+ m_points.append(closest_point);
+ }
+ else if(distance * width() > 5)
+ {
+ closest_point = new TQPair<double,double>;
+ closest_point->first = x;
+ closest_point->second = y;
+ m_points.insert(insert_pos, closest_point);
+ }
+ else
+ if(fabs(y - closest_point->second) * width() > 5)
+ return;
+
+
+ m_grab_point = closest_point;
+ m_grabOffsetX = m_grab_point->first - x;
+ m_grabOffsetY = m_grab_point->second - y;
+ m_grab_point->first = x + m_grabOffsetX;
+ m_grab_point->second = y + m_grabOffsetY;
+ m_dragging = true;
+
+ setCursor( KCursor::crossCursor() );
+
+ // Determine the leftmost and rightmost points.
+ m_leftmost = 0;
+ m_rightmost = 1;
+
+ p = m_points.first();
+ while(p)
+ {
+ if (p != m_grab_point)
+ {
+ if(p->first> m_leftmost && p->first < x)
+ m_leftmost = p->first;
+ if(p->first < m_rightmost && p->first > x)
+ m_rightmost = p->first;
+ }
+ p = m_points.next();
+ }
+ repaint(false);
+}
+
+void KCurve::mouseReleaseEvent ( TQMouseEvent * e )
+{
+ if (m_readOnlyMode) return;
+
+ if (e->button() != Qt::LeftButton)
+ return;
+
+ setCursor( KCursor::arrowCursor() );
+ m_dragging = false;
+ repaint(false);
+ emit modified();
+}
+
+void KCurve::mouseMoveEvent ( TQMouseEvent * e )
+{
+ if (m_readOnlyMode) return;
+
+ double x = e->pos().x() / (float)width();
+ double y = 1.0 - e->pos().y() / (float)height();
+
+ if (m_dragging == false) // If no point is selected set the the cursor shape if on top
+ {
+ double distance = 1000;
+ double ydistance = 1000;
+ TQPair<double,double> *p = m_points.first();
+ while(p)
+ {
+ if (fabs (x - p->first) < distance)
+ {
+ distance = fabs(x - p->first);
+ ydistance = fabs(y - p->second);
+ }
+ p = m_points.next();
+ }
+
+ if (distance * width() > 5 || ydistance * height() > 5)
+ setCursor( KCursor::arrowCursor() );
+ else
+ setCursor( KCursor::crossCursor() );
+ }
+ else // Else, drag the selected point
+ {
+ setCursor( KCursor::crossCursor() );
+
+ x += m_grabOffsetX;
+ y += m_grabOffsetY;
+
+ if (x <= m_leftmost)
+ x = m_leftmost + 1E-4; // the addition so we can grab the dot later.
+
+ if(x >= m_rightmost)
+ x = m_rightmost - 1E-4;
+
+ if(y > 1.0)
+ y = 1.0;
+
+ if(y < 0.0)
+ y = 0.0;
+
+ m_grab_point->first = x;
+ m_grab_point->second = y;
+
+ emit modified();
+ }
+
+ repaint(false);
+}
+
+double KCurve::getCurveValue(double x)
+{
+ return getCurveValue(m_points, x);
+}
+
+double KCurve::getCurveValue(TQPtrList<TQPair<double,double> > &curve, double x)
+{
+ double t;
+ TQPair<double,double> *p;
+ TQPair<double,double> *p0,*p1,*p2,*p3;
+ double c0,c1,c2,c3;
+ double val;
+
+ if(curve.count() == 0)
+ return 0.5;
+
+ // First find curve segment
+ p = curve.first();
+ if(x < p->first)
+ return p->second;
+
+ p = curve.last();
+ if(x >= p->first)
+ return p->second;
+
+ // Find the four control points (two on each side of x)
+ p = curve.first();
+ while(x >= p->first)
+ {
+ p = curve.next();
+ }
+ curve.prev();
+
+ if((p0 = curve.prev()) == NULL)
+ p1 = p0 = curve.first();
+ else
+ p1 = curve.next();
+
+ p2 = curve.next();
+ if( (p = curve.next()) )
+ p3 = p;
+ else
+ p3 = p2;
+
+ // Calculate the value
+ t = (x - p1->first) / (p2->first - p1->first);
+ c2 = (p2->second - p0->second) * (p2->first-p1->first) / (p2->first-p0->first);
+ c3 = p1->second;
+ c0 = -2*p2->second + 2*c3 + c2 + (p3->second - p1->second) * (p2->first - p1->first) / (p3->first - p1->first);
+ c1 = p2->second - c3 - c2 - c0;
+ val = ((c0*t + c1)*t + c2)*t + c3;
+
+ if(val < 0.0)
+ val = 0.0;
+ if(val > 1.0)
+ val = 1.0;
+ return val;
+}
+
+TQPtrList<TQPair<double,double> > KCurve::getCurve()
+{
+ TQPtrList<TQPair<double,double> > outlist;
+ TQPair<double,double> *p;
+ TQPair<double,double> *outpoint;
+
+ p = m_points.first();
+ while(p)
+ {
+ outpoint = new TQPair<double,double>(p->first, p->second);
+ outlist.append(outpoint);
+ p = m_points.next();
+ }
+ return outlist;
+}
+
+void KCurve::setCurve(TQPtrList<TQPair<double,double> >inlist)
+{
+ TQPair<double,double> *p;
+ TQPair<double,double> *inpoint;
+
+ m_points.clear();
+
+ inpoint = inlist.first();
+ while(inpoint)
+ {
+ p = new TQPair<double,double>(inpoint->first, inpoint->second);
+ m_points.append(p);
+ inpoint = inlist.next();
+ }
+}
+
+void KCurve::leaveEvent( TQEvent * )
+{
+}
+
+#include "kcurve.moc"
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