summaryrefslogtreecommitdiffstats
path: root/kbruch/src/exerciseconvert.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'kbruch/src/exerciseconvert.cpp')
-rw-r--r--kbruch/src/exerciseconvert.cpp467
1 files changed, 467 insertions, 0 deletions
diff --git a/kbruch/src/exerciseconvert.cpp b/kbruch/src/exerciseconvert.cpp
new file mode 100644
index 00000000..1207ecbf
--- /dev/null
+++ b/kbruch/src/exerciseconvert.cpp
@@ -0,0 +1,467 @@
+/***************************************************************************
+ exerciseconvert.h
+ -------------------
+ begin : 2004/06/04
+ copyright : (C) 2004 by Sebastian Stein
+ email : seb.kde@hpfsc.de
+ ***************************************************************************/
+
+/***************************************************************************
+ * *
+ * 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. *
+ * *
+ ***************************************************************************/
+
+#include "exerciseconvert.h"
+#include "exerciseconvert.moc"
+
+/* these includes are needed for KDE support */
+#include <kapplication.h>
+#include <klocale.h>
+#include <kmessagebox.h>
+#include <knumvalidator.h>
+
+/* these includes are needed for Qt support */
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qlineedit.h>
+#include <qpushbutton.h>
+#include <qtooltip.h>
+#include <qwhatsthis.h>
+
+/* standard C++ library includes */
+#include <stdlib.h>
+
+#include "rationalwidget.h"
+#include "resultwidget.h"
+
+/* ----- public member functions ----- */
+
+/* constructor */
+ExerciseConvert::ExerciseConvert(QWidget * parent, const char * name):
+ ExerciseBase(parent, name)
+{
+#ifdef DEBUG
+ kdDebug() << "constructor ExerciseConvert()" << endl;
+#endif
+
+ /* create a new task */
+ QApplication::setOverrideCursor(waitCursor); /* show the sand clock */
+ createTask();
+ QApplication::restoreOverrideCursor(); /* show the normal cursor */
+
+ // the next thing to do on a button click would be to check the entered
+ // result
+ m_currentState = _CHECK_TASK;
+
+ baseWidget = new QWidget(this, "baseWidget");
+ baseGrid = new QGridLayout(this, 1, 1, 0, -1, "baseGrid");
+ baseGrid->addWidget(baseWidget, 0, 0);
+
+ // this is a VBox
+ realLayout = new QVBoxLayout(baseWidget, 5, 5, "realLayout");
+
+ // add a spacer at the top of the VBox
+ QSpacerItem * v_spacer = new QSpacerItem(1, 1);
+ realLayout->addItem(v_spacer);
+
+ // now a line holding the task, input fields and result
+ QHBoxLayout * taskLineHBoxLayout = new QHBoxLayout(5, "taskLineHBoxLayout");
+ realLayout->addLayout(taskLineHBoxLayout);
+
+ // first left is the rational widget
+ m_rationalWidget = new RationalWidget(baseWidget, "m_rationalWidget", m_number, m_periodStart, m_periodLength);
+// taskLineHBoxLayout->addWidget(m_rationalWidget);
+
+ // now we have the input fields aligned in a VBox
+ QVBoxLayout * inputLayout = new QVBoxLayout(5, "inputLayout");
+// taskLineHBoxLayout->addLayout(inputLayout);
+
+ // to validate, that the input is an int
+ KIntValidator *valnum = new KIntValidator( this );
+
+ /* add input box so the user can enter numerator */
+ numer_edit = new QLineEdit(baseWidget, "numer_edit");
+ numer_edit->setValidator( valnum ); // use the int validator
+ QToolTip::add(numer_edit, i18n("Enter the numerator of your result"));
+ inputLayout->addWidget(numer_edit);
+
+ /* add a line between the edit boxes */
+ edit_line = new QFrame(baseWidget, "edit_line");
+ edit_line->setGeometry(QRect(100, 100, 20, 20));
+ edit_line->setFrameStyle(QFrame::HLine | QFrame::Sunken);
+ inputLayout->addWidget(edit_line);
+
+ /* add input box so the user can enter denominator */
+ deno_edit = new QLineEdit(baseWidget, "deno_edit");
+ deno_edit->setValidator( valnum ); // use the int validator
+ QToolTip::add(deno_edit, i18n("Enter the denominator of your result"));
+ inputLayout->addWidget(deno_edit);
+
+ // next is the result widget
+ m_resultWidget = new ResultWidget(baseWidget, "m_resultWidget", m_result);
+// taskLineHBoxLayout->addWidget(m_resultWidget);
+ m_resultWidget->hide();
+
+ // at the right end we have a label just showing CORRECT or WRONG
+ result_label = new QLabel(baseWidget, "result_lable");
+ result_label->setText(i18n("WRONG"));
+// taskLineHBoxLayout->addWidget(result_label);
+ result_label->hide();
+
+ // add another spacer in the middle of the VBox
+ v_spacer = new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum);
+// taskLineHBoxLayout->addItem(v_spacer);
+
+ // --- that is the end of the horizontal line ---
+
+ // in RTL desktops, we still need to allign the
+ // execise to the left. On Qt4, you can set the direction
+ // of the layout to LTR (instead of inherit), but on Qt3
+ // the only way of fixing it is inserting the widgets in reversed
+ // order to the layout.
+ //
+ // if you need help with this feel free to contact me - Diego <elcuco@kde.org> )
+ // This should fix parts of bug #116831
+ if (QApplication::reverseLayout())
+ {
+ taskLineHBoxLayout->addItem(v_spacer);
+ taskLineHBoxLayout->addWidget(result_label);
+ taskLineHBoxLayout->addWidget(m_resultWidget);
+ taskLineHBoxLayout->addLayout(inputLayout);
+ taskLineHBoxLayout->addWidget(m_rationalWidget);
+ }
+ else
+ {
+ taskLineHBoxLayout->addWidget(m_rationalWidget);
+ taskLineHBoxLayout->addLayout(inputLayout);
+ taskLineHBoxLayout->addWidget(m_resultWidget);
+ taskLineHBoxLayout->addWidget(result_label);
+ taskLineHBoxLayout->addItem(v_spacer);
+ }
+
+ // add another spacer in the middle of the VBox
+ v_spacer = new QSpacerItem(1, 1);
+ realLayout->addItem(v_spacer);
+
+ // the lower part of the VBox holds just a right aligned button
+ QHBoxLayout * lowerHBox = new QHBoxLayout(1, "lowerHBox");
+ realLayout->addLayout(lowerHBox);
+ lowerHBox->addStretch(100);
+
+ // the right aligned button
+ m_checkButton = new QPushButton( baseWidget, "m_checkButton" );
+ m_checkButton->setText(i18n("&Check Task"));
+ m_checkButton->setDefault(true); // is the default button of the dialog
+ QToolTip::add(m_checkButton, i18n("Click on this button to check your result. The button will not work if you have not entered a result yet."));
+ lowerHBox->addWidget(m_checkButton, 1, Qt::AlignRight);
+ QObject::connect(m_checkButton, SIGNAL(clicked()), this, SLOT(slotCheckButtonClicked()));
+
+ // that the user can start typing without moving the focus
+ numer_edit->setFocus();
+
+ // show the whole layout
+ baseWidget->show();
+
+ // add tooltip and qwhatsthis help to the widget
+ QToolTip::add(this, i18n("In this exercise you have to convert a number into a fraction."));
+ QWhatsThis::add(this, i18n("In this exercise you have to convert a given number into a fraction by entering numerator and denominator. Do not forget to reduce the result!"));
+}
+
+/* destructor */
+ExerciseConvert::~ExerciseConvert()
+{
+#ifdef DEBUG
+ kdDebug() << "destructor ExerciseConvert()" << endl;
+#endif
+
+ /* no need to delete any child widgets, Qt does it by itself */
+}
+
+/** resets the current state, creates a new task and count the last task as
+ * wrong, if it wasn't solved (in _NEXT_TASK state) yet
+ * mainly used after changing the task parameters */
+void ExerciseConvert::forceNewTask()
+{
+#ifdef DEBUG
+ kdDebug() << "forceNewTask ExerciseConvert()" << endl;
+#endif
+
+ if (m_currentState == _CHECK_TASK)
+ {
+ // emit the signal for wrong
+ signalExerciseSolvedWrong();
+ }
+ m_currentState = _CHECK_TASK;
+ m_checkButton->setText(i18n("&Check Task"));
+
+ // generate next task
+ (void) nextTask();
+}
+
+
+/* ------ public slots ------ */
+
+void ExerciseConvert::update()
+{
+ // call update of components
+ m_rationalWidget->updateAndRepaint();
+ m_resultWidget->updateAndRepaint();
+
+ // update for itself
+ ((QWidget *) this)->update();
+}
+
+
+/* ------ private member functions ------ */
+
+void ExerciseConvert::createTask()
+{
+ // the tasks are hardcoded here; there are some algorithms to convert
+ // rational numbers to fractions, but it is not worth the effort here
+ switch(int((double(rand()) / RAND_MAX) * 18 + 1))
+ {
+ case 0 : m_number = KGlobal::locale()->formatNumber(0.5, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 2);
+ break;
+ case 1 : m_number = KGlobal::locale()->formatNumber(0.3, 1);
+ m_periodStart = 2;
+ m_periodLength = 1;
+ m_result = ratio(1, 3);
+ break;
+ case 2 : m_number = KGlobal::locale()->formatNumber(0.6, 1);
+ m_periodStart = 2;
+ m_periodLength = 1;
+ m_result = ratio(2, 3);
+ break;
+ case 3 : m_number = KGlobal::locale()->formatNumber(0.25, 2);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 4);
+ break;
+ case 4 : m_number = KGlobal::locale()->formatNumber(0.75, 2);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(3, 4);
+ break;
+ case 5 : m_number = KGlobal::locale()->formatNumber(0.2, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 5);
+ break;
+ case 6 : m_number = KGlobal::locale()->formatNumber(0.4, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(2, 5);
+ break;
+ case 7 : m_number = KGlobal::locale()->formatNumber(0.6, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(3, 5);
+ break;
+ case 8 : m_number = KGlobal::locale()->formatNumber(0.8, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(4, 5);
+ break;
+ case 9 : m_number = KGlobal::locale()->formatNumber(0.16, 2);
+ m_periodStart = 3;
+ m_periodLength = 1;
+ m_result = ratio(1, 6);
+ break;
+ case 10 : m_number = KGlobal::locale()->formatNumber(0.142857, 6);
+ m_periodStart = 2;
+ m_periodLength = 6;
+ m_result = ratio(1, 7);
+ break;
+ case 11 : m_number = KGlobal::locale()->formatNumber(0.125, 3);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 8);
+ break;
+ case 12 : m_number = KGlobal::locale()->formatNumber(0.375, 3);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(3, 8);
+ break;
+ case 13 : m_number = KGlobal::locale()->formatNumber(0.1, 1);
+ m_periodStart = 2;
+ m_periodLength = 1;
+ m_result = ratio(1, 9);
+ break;
+ case 14 : m_number = KGlobal::locale()->formatNumber(0.1, 1);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 10);
+ break;
+ case 15 : m_number = KGlobal::locale()->formatNumber(0.05, 2);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 20);
+ break;
+ case 16 : m_number = KGlobal::locale()->formatNumber(0.01, 2);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 100);
+ break;
+ case 17 : m_number = KGlobal::locale()->formatNumber(0.83, 2);
+ m_periodStart = 3;
+ m_periodLength = 1;
+ m_result = ratio(5, 6);
+ break;
+ default :
+ case 18 : m_number = KGlobal::locale()->formatNumber(0.001, 3);
+ m_periodStart = 2;
+ m_periodLength = 0;
+ m_result = ratio(1, 1000);
+ break;
+ }
+
+ return;
+}
+
+/** - checks, if the user solved the task correctly
+ - emits signals if task was solved correctly or wrong */
+void ExerciseConvert::showResult()
+{
+ QString tmp_str; /* to build a string for a label */
+ QPalette pal;
+ QColorGroup cg;
+ ratio entered_result;
+
+ // change the tooltip of the check button
+ QToolTip::add(m_checkButton, i18n("Click on this button to get to the next task."));
+
+ numer_edit->setEnabled(false);
+ deno_edit->setEnabled(false);
+
+ m_resultWidget->setResult(m_result);
+ m_resultWidget->show();
+
+ // an empty numerator field will be interpreted as 0
+ if (numer_edit->text().isEmpty() == true)
+ numer_edit->setText("0");
+
+ // an empty denominator field will be interpreted as 1
+ if (deno_edit->text().isEmpty() == true)
+ deno_edit->setText("1");
+
+ /* store the entered result to check it, but without reducing */
+ entered_result.setNumerator(numer_edit->text().toInt(), false);
+ entered_result.setDenominator(deno_edit->text().toInt(), false);
+
+ // check the entered result; 0/1 == 0/5 -> true,
+ // but 0/1 == 0/0 -> false
+ // a 0 for denominator is never allowed (always counted as wrong)
+ //
+ // we have to get the 0 directly from the input field, because
+ // Ratio::setDenominator(0, false) will set the denominator to 1 to ensure
+ // the Ratio is valid
+ if ( (deno_edit->text().toInt() != 0) && ((entered_result == m_result) ||
+ (m_result.numerator() == 0 && entered_result.numerator() == 0)) )
+ {
+ // emit the signal for correct
+ signalExerciseSolvedCorrect();
+
+ /* yes, the user entered the correct result */
+ result_label->setText(i18n("CORRECT"));
+ pal = result_label->palette(); /* set green font color */
+ cg = pal.active();
+ cg.setColor(QColorGroup::Foreground, QColor(6, 179, 0));
+ pal.setActive(cg);
+ cg = pal.inactive();
+ cg.setColor(QColorGroup::Foreground, QColor(6, 179, 0));
+ pal.setInactive(cg);
+ result_label->setPalette(pal);
+ result_label->show(); /* show the result at the end of the task */
+ } else {
+ // emit the signal for wrong
+ signalExerciseSolvedWrong();
+
+ /* no, the user entered the wrong result */
+ result_label->setText(i18n("WRONG"));
+ pal = result_label->palette(); /* set red font color */
+ cg = pal.active();
+ cg.setColor(QColorGroup::Foreground, QColor(red));
+ pal.setActive(cg);
+ cg = pal.inactive();
+ cg.setColor(QColorGroup::Foreground, QColor(red));
+ pal.setInactive(cg);
+ result_label->setPalette(pal);
+
+ result_label->show(); /* show the result at the end of the task */
+
+ // if the user entered a 0 for the denominator (division by 0) we have to
+ // get the 0 directly from the input field, because
+ // Ratio::setDenominator(0, true) will set the denominator to 1 to ensure
+ // the Ratio is valid
+ if (deno_edit->text().toInt() == 0)
+ {
+ KMessageBox::information(this,
+ i18n("You entered a 0 as the denominator. This means division by zero, which is not allowed. This task will be counted as not correctly solved."));
+ } else {
+ /* maybe the entered ratio was not reduced */
+ entered_result.reduce();
+ if (entered_result == m_result)
+ KMessageBox::information(this,
+ i18n("You entered the correct result, but not reduced.\nAlways enter your results as reduced. This task will be counted as not correctly solved."));
+ }
+ } /* if (entered_result == result) */
+
+ return;
+}
+
+/** generate the next task and show it to the user */
+void ExerciseConvert::nextTask()
+{
+ // change the tooltip of the check button
+ QToolTip::add(m_checkButton, i18n("Click on this button to check your result. The button will not work if you have not entered a result yet."));
+
+ numer_edit->setEnabled(true);
+ deno_edit->setEnabled(true);
+
+ result_label->hide(); /* do not show the result at the end of the task */
+ m_resultWidget->hide();
+
+ /* clear user input */
+ deno_edit->setText("");
+ numer_edit->setText("");
+ numer_edit->setFocus();
+
+ /* create a new task */
+ QApplication::setOverrideCursor(waitCursor); /* show the sand clock */
+ createTask();
+ QApplication::restoreOverrideCursor(); /* show the normal cursor */
+
+ // update the task widget
+ m_rationalWidget->setRational(m_number, m_periodStart, m_periodLength);
+
+ return;
+}
+
+/* ------ private slots ------ */
+
+void ExerciseConvert::slotCheckButtonClicked()
+{
+ if (m_currentState == _CHECK_TASK)
+ {
+ // if nothing has been entered by the user, we don't check the result yet
+ if (numer_edit->text().isEmpty() == true && deno_edit->text().isEmpty() ==
+true)
+ return;
+ m_currentState = _NEXT_TASK;
+ m_checkButton->setText(i18n("N&ext Task"));
+ (void) showResult();
+ } else {
+ m_currentState = _CHECK_TASK;
+ m_checkButton->setText(i18n("&Check Task"));
+ (void) nextTask();
+ }
+
+ return;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-18 07:50:57 +0000