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Diffstat (limited to 'qtsharp/src/examples/samples/mandelbrot.cs')
-rw-r--r-- | qtsharp/src/examples/samples/mandelbrot.cs | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/qtsharp/src/examples/samples/mandelbrot.cs b/qtsharp/src/examples/samples/mandelbrot.cs new file mode 100644 index 00000000..5dbd9b85 --- /dev/null +++ b/qtsharp/src/examples/samples/mandelbrot.cs @@ -0,0 +1,264 @@ +// Mandelbrot 0.1: A demonstration of Qt# +// +// Copyright 2002 Marcus Urban +// +// 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. + +// NOTE: +// Variables with names like PlotXMin are in the cartesian coordinate plane. +// Those with names like ImageXMin was in a translated coordinate system +// where (0, 0) is the upper-left corner. + + +using System; +using Qt; + + +// This struct is a simple implementation of complex numbers. +// It was originally in a separate file because it is useful +// in its own right. It is included here file only to make the +// compilation process simpler of new users. + +public struct Complex { + + private double re, im; + //private int x; + + public Complex (double re, double im) + { + this.re = re; + this.im = im; + } + + public static implicit operator Complex (double re) + { + return new Complex (re, 0.0); + } + + public double Re + { + get { return re; } + } + + public double Im + { + get { return im; } + } + + public static double Abs (Complex a) + { + return Math.Abs (a.re) >= Math.Abs (a.im) ? + Math.Abs (a.re) * Math.Sqrt( 1.0 + (a.im/a.re)*(a.im/a.re) ) : + Math.Abs (a.im) * Math.Sqrt( 1.0 + (a.re/a.im)*(a.re/a.im) ); + } + + public static Complex operator + (Complex a, Complex b) + { + return new Complex (a.re + b.re, a.im + b.im); + } + + public static Complex operator - (Complex a, Complex b) + { + return new Complex (a.re - b.re, a.im - b.im); + } + + public static Complex operator * (Complex a, Complex b) + { + return new Complex ( a.re*b.re - a.im*b.im, a.im*b.re + a.re*b.im ); + } + + // Division isn't pretty. Do it later. + + public override string ToString () + { + return this.re.ToString () + "+" + this.im.ToString () + "i"; + } +} + + +public class Mandelbrot { + + public static int Iterations ( Complex c ) + { + const int MaximumIterations = 16; + Complex value = c; + int currentDepth = 1; + + while ( Complex.Abs(value) < 2.0 && currentDepth <= MaximumIterations ) { + ++currentDepth; + value = (value * value) + c; + } + return currentDepth; + } + + + public static void Main (string[] args) + { + QApplication app = new QApplication (args); + + ImageDialog dialog = new ImageDialog (null, "Mandelbrot", false, 0); + dialog.Show (); + app.SetMainWidget (dialog); + app.Exec (); + + } +} + + +public class ImageDialog : QDialog { + + const double DefaultPlotXMin = -2.0; + const double DefaultPlotXMax = 2.0; + const double DefaultPlotYMin = -1.5; + const double DefaultPlotYMax = 1.5; + + QHBoxLayout dialogLayout; + QGridLayout gridLayout; + QVBoxLayout leftLayout; + QHBoxLayout buttonLayout; + QPushButton redrawButton; + QLabel pixmapLabel; + QSizePolicy fixedSizePolicy; + + QLabel XMinLabel, XMaxLabel, YMinLabel, YMaxLabel; + QLineEdit editXMin, editXMax, editYMin, editYMax; + + public ImageDialog (QWidget parent, string name, bool modal, WidgetFlags fl): + base (parent, name, modal, fl) + { + if (name == string.Empty) + SetName ("imageDialog"); + SetCaption ("Mandelbrot Image"); + + dialogLayout = new QHBoxLayout (this, 11, 6); + gridLayout = new QGridLayout (null, 1, 1, 0, 6, "gridLayout"); + leftLayout = new QVBoxLayout (null, 0, 6, "leftLayout"); + + fixedSizePolicy = new QSizePolicy (); + fixedSizePolicy.SetHorData (QSizePolicy.SizeType.Fixed); + fixedSizePolicy.SetVerData (QSizePolicy.SizeType.Fixed); + + XMinLabel = new QLabel ("Xmin", this); + XMinLabel.SetSizePolicy (fixedSizePolicy); + gridLayout.AddWidget (XMinLabel, 0, 0); + + XMaxLabel = new QLabel ("Xmax", this); + XMaxLabel.SetSizePolicy(fixedSizePolicy); + gridLayout.AddWidget (XMaxLabel, 1, 0); + + YMinLabel = new QLabel ("Ymin", this); + YMinLabel.SetSizePolicy (fixedSizePolicy); + gridLayout.AddWidget (YMinLabel, 2, 0); + + YMaxLabel = new QLabel ("Ymax", this); + YMaxLabel.SetSizePolicy (fixedSizePolicy); + gridLayout.AddWidget (YMaxLabel, 3, 0); + + QDoubleValidator validator = new QDoubleValidator (this); + + editXMin = new QLineEdit (this, "editXMin"); + editXMin.SetText (Convert.ToString (DefaultPlotXMin)); + editXMin.SetValidator (validator); + gridLayout.AddWidget (editXMin, 0, 1); + + editXMax = new QLineEdit (this, "editXMax"); + editXMax.SetText (Convert.ToString(DefaultPlotXMax)); + editXMax.SetValidator (validator); + gridLayout.AddWidget (editXMax, 1, 1); + + editYMin = new QLineEdit (this, "editYMin"); + editYMin.SetText (Convert.ToString(DefaultPlotYMin)); + editYMin.SetValidator (validator); + gridLayout.AddWidget (editYMin, 2, 1); + + editYMax = new QLineEdit (this, "editYMax"); + editYMax.SetText (Convert.ToString(DefaultPlotYMax)); + editYMax.SetValidator (validator); + gridLayout.AddWidget (editYMax, 3, 1); + + leftLayout.AddLayout (gridLayout); + QSpacerItem spacer1 = new QSpacerItem (0, 0, 0, 0); + leftLayout.AddItem (spacer1); + + buttonLayout = new QHBoxLayout (null, 0, 6, "buttonLayout"); + QSpacerItem spacer2 = new QSpacerItem (0, 0, 0, 0); + buttonLayout.AddItem (spacer2); + + redrawButton = new QPushButton ("Redraw", this); + redrawButton.SetDefault (true); + buttonLayout.AddWidget (redrawButton); + + QSpacerItem spacer3 = new QSpacerItem (0, 0, 0, 0); + buttonLayout.AddItem (spacer3); + + leftLayout.AddLayout (buttonLayout); + + dialogLayout.AddLayout (leftLayout); + QSpacerItem spacer4 = new QSpacerItem (0, 0, 0, 0); + dialogLayout.AddItem (spacer4); + + pixmapLabel = new QLabel (this, "pixmapLabel", 0); + pixmapLabel.SetScaledContents (true); + dialogLayout.AddWidget (pixmapLabel); + + QObject.Connect (redrawButton, SIGNAL ("clicked()"), this, SLOT ("Redraw()")); + + Redraw (); + } + + + QImage MandelbrotImage () + { + int depth; + double real, imag; + + double PlotXMin = Convert.ToDouble ( editXMin.Text () ); + double PlotXMax = Convert.ToDouble ( editXMax.Text () ); + double PlotYMin = Convert.ToDouble ( editYMin.Text () ); + double PlotYMax = Convert.ToDouble ( editYMax.Text () ); + + int ImageXMax = pixmapLabel.Width (); + int ImageYMax = pixmapLabel.Height (); + + QImage image = new QImage (ImageXMax, ImageYMax, 32, 0); + + for (int x = 0; x <= ImageXMax - 1; x+=1) { + for (int y = 0; y <= ImageYMax - 1; y+=1) { + real = (PlotXMax - PlotXMin)/ImageXMax * x + PlotXMin; + imag = (PlotYMin - PlotYMax)/ImageYMax * y + PlotYMax; + depth = Mandelbrot.Iterations ( new Complex (real, imag) ); + image.SetPixel ( x, y, (uint) depth*16 ); + } + } + + return image; + } + + public void Redraw () + { + QSize s = pixmapLabel.BaseSize (); + pixmapLabel.Resize (400,300); + QApplication.SetOverrideCursor ( new QCursor( (int) CursorShape.WaitCursor )); + QImage image = MandelbrotImage (); + QPixmap pixmap = new QPixmap (image); + pixmapLabel.SetPixmap( pixmap); + image.Dispose (); + pixmap.Dispose (); + this.AdjustSize (); + QApplication.RestoreOverrideCursor (); + } +} + + |