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(WIP) Interpolation of strokes. Progress so far:

Browse Source 
- UBGraphicsScene calls UBGraphicsStroke::addPoint, which returns a list
of points that can be drawn. It may be none (e.g we discard very small
segments), one (if we do no interpolation) or several.

- Added a UBInterpolator base, abstract class. Various interpolation
methods can be added easily.

- Current methods: Basic spline (custom), Catmull-Rom spline (based on
alglib), and Bézier

- Added a setting to toggle interpolation. Added this to the UI as well
preferencesAboutTextFull
Craig Watson 9 years ago
parent fb6bc855e9
commit 4491341a4d
12 changed files with 732 additions and 204 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 3
      OpenBoard.pro
  2. 415
      resources/forms/brushProperties.ui
  3. 2
      src/core/UBPreferencesController.cpp
  4. 2
      src/core/UBSettings.cpp
  5. 2
      src/core/UBSettings.h
  6. 88
      src/domain/UBGraphicsScene.cpp
  7. 1
      src/domain/UBGraphicsScene.h
  8. 171
      src/domain/UBGraphicsStroke.cpp
  9. 11
      src/domain/UBGraphicsStroke.h
  10. 139
      src/frameworks/UBInterpolator.cpp
  11. 96
      src/frameworks/UBInterpolator.h
  12. 6
      src/frameworks/frameworks.pri

3
OpenBoard.pro
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@ -66,6 +66,9 @@ INCLUDEPATH += src/pdf-merger
include(src/pdf-merger/pdfMerger.pri)
#ThirdParty
INCLUDEPATH += $$THIRD_PARTY_PATH/spline/
INCLUDEPATH += $$THIRD_PARTY_PATH/alglib/
include($$THIRD_PARTY_PATH/alglib/alglib.pri)
DEPENDPATH += $$THIRD_PARTY_PATH/quazip/
INCLUDEPATH += $$THIRD_PARTY_PATH/quazip/
include($$THIRD_PARTY_PATH/quazip/quazip.pri)

415
resources/forms/brushProperties.ui
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@ -1,7 +1,8 @@
<ui version="4.0" >
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>brushProperties</class>
<widget class="QFrame" name="brushProperties" >
<property name="geometry" >
<widget class="QFrame" name="brushProperties">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
@ -9,25 +10,25 @@
<height>808</height>
</rect>
</property>
<property name="windowTitle" >
<property name="windowTitle">
<string/>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Plain</enum>
</property>
<layout class="QGridLayout" name="gridLayout" >
<item row="0" column="1" >
<spacer name="nSpacer" >
<property name="orientation" >
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="1">
<spacer name="nSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeType" >
<property name="sizeType">
<enum>QSizePolicy::Fixed</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
@ -35,53 +36,40 @@
</property>
</spacer>
</item>
<item row="1" column="0" >
<spacer name="nwSpacer" >
<property name="orientation" >
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="1" >
<widget class="QFrame" name="colorFrame" >
<property name="frameShape" >
<item row="1" column="1">
<widget class="QFrame" name="colorFrame">
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
<layout class="QVBoxLayout" name="verticalLayout" >
<property name="spacing" >
<layout class="QVBoxLayout" name="verticalLayout">
<property name="spacing">
<number>0</number>
</property>
<item>
<widget class="QFrame" name="lightBackgroundFrame" >
<property name="frameShape" >
<widget class="QFrame" name="lightBackgroundFrame">
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
<layout class="QHBoxLayout" name="lightBackgroundLayout" >
<layout class="QHBoxLayout" name="lightBackgroundLayout">
<item>
<widget class="QLabel" name="lightBackgroundLabel" >
<property name="text" >
<widget class="QLabel" name="lightBackgroundLabel">
<property name="text">
<string>On Light Background</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer" >
<property name="orientation" >
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
@ -90,17 +78,17 @@
</spacer>
</item>
<item>
<widget class="UBColorPicker" name="lightBackgroundColorPicker0" >
<property name="minimumSize" >
<widget class="UBColorPicker" name="lightBackgroundColorPicker0">
<property name="minimumSize">
<size>
<width>32</width>
<height>32</height>
</size>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
@ -109,27 +97,27 @@
</widget>
</item>
<item>
<widget class="QFrame" name="darkBackgroundFrame" >
<property name="frameShape" >
<widget class="QFrame" name="darkBackgroundFrame">
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
<layout class="QHBoxLayout" name="darkBackgroundLayout" >
<layout class="QHBoxLayout" name="darkBackgroundLayout">
<item>
<widget class="QLabel" name="darkBackgroundLabel" >
<property name="text" >
<widget class="QLabel" name="darkBackgroundLabel">
<property name="text">
<string>On Dark Background</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_2" >
<property name="orientation" >
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
@ -138,17 +126,17 @@
</spacer>
</item>
<item>
<widget class="UBColorPicker" name="darkBackgroundColorPicker0" >
<property name="minimumSize" >
<widget class="UBColorPicker" name="darkBackgroundColorPicker0">
<property name="minimumSize">
<size>
<width>32</width>
<height>32</height>
</size>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
@ -159,34 +147,21 @@
</layout>
</widget>
</item>
<item row="1" column="2" >
<spacer name="neSpacer" >
<property name="orientation" >
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
<item row="2" column="0" colspan="3" >
<widget class="QFrame" name="opacityFrame" >
<property name="frameShape" >
<item row="2" column="0" colspan="3">
<widget class="QFrame" name="opacityFrame">
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
<layout class="QHBoxLayout" name="horizontalLayout" >
<layout class="QHBoxLayout" name="horizontalLayout">
<item>
<spacer name="wSpacer_2" >
<property name="orientation" >
<spacer name="wSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>154</width>
<height>20</height>
@ -195,40 +170,40 @@
</spacer>
</item>
<item>
<widget class="QLabel" name="opacityLabel" >
<property name="text" >
<widget class="QLabel" name="opacityLabel">
<property name="text">
<string>Opacity</string>
</property>
</widget>
</item>
<item>
<widget class="QSlider" name="opacitySlider" >
<property name="minimum" >
<widget class="QSlider" name="opacitySlider">
<property name="minimum">
<number>20</number>
</property>
<property name="maximum" >
<property name="maximum">
<number>100</number>
</property>
<property name="value" >
<property name="value">
<number>50</number>
</property>
<property name="orientation" >
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition" >
<property name="tickPosition">
<enum>QSlider::TicksAbove</enum>
</property>
<property name="tickInterval" >
<property name="tickInterval">
<number>20</number>
</property>
</widget>
</item>
<item>
<spacer name="eSpacer_2" >
<property name="orientation" >
<spacer name="eSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>156</width>
<height>20</height>
@ -239,40 +214,27 @@
</layout>
</widget>
</item>
<item row="3" column="1" >
<spacer name="cSpacer" >
<property name="orientation" >
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0" >
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
<item row="4" column="0" colspan="3" >
<widget class="QGroupBox" name="lineWidthGroupBox" >
<property name="sizePolicy" >
<sizepolicy vsizetype="Preferred" hsizetype="Minimum" >
<item row="4" column="0" colspan="3">
<widget class="QGroupBox" name="lineWidthGroupBox">
<property name="sizePolicy">
<sizepolicy hsizetype="Minimum" vsizetype="Preferred">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="title" >
<property name="title">
<string>Line Width</string>
</property>
<layout class="QGridLayout" name="gridLayout_2" >
<item row="1" column="1" >
<spacer name="wSpacer" >
<property name="orientation" >
<layout class="QGridLayout" name="gridLayout_2">
<item row="1" column="1">
<spacer name="wSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeType" >
<property name="sizeType">
<enum>QSizePolicy::Fixed</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
@ -280,15 +242,15 @@
</property>
</spacer>
</item>
<item row="1" column="3" >
<spacer name="eSpacer" >
<property name="orientation" >
<item row="1" column="3">
<spacer name="eSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeType" >
<property name="sizeType">
<enum>QSizePolicy::Fixed</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
@ -296,149 +258,149 @@
</property>
</spacer>
</item>
<item row="1" column="2" >
<widget class="QSlider" name="fineSlider" >
<property name="minimum" >
<item row="1" column="2">
<widget class="QSlider" name="fineSlider">
<property name="minimum">
<number>5</number>
</property>
<property name="maximum" >
<property name="maximum">
<number>500</number>
</property>
<property name="value" >
<property name="value">
<number>5</number>
</property>
<property name="orientation" >
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition" >
<property name="tickPosition">
<enum>QSlider::TicksAbove</enum>
</property>
<property name="tickInterval" >
<property name="tickInterval">
<number>100</number>
</property>
</widget>
</item>
<item row="2" column="0" >
<widget class="QLabel" name="mediumLabel" >
<property name="text" >
<item row="2" column="0">
<widget class="QLabel" name="mediumLabel">
<property name="text">
<string>Medium</string>
</property>
</widget>
</item>
<item row="2" column="2" >
<widget class="QSlider" name="mediumSlider" >
<property name="minimum" >
<item row="2" column="2">
<widget class="QSlider" name="mediumSlider">
<property name="minimum">
<number>5</number>
</property>
<property name="maximum" >
<property name="maximum">
<number>500</number>
</property>
<property name="orientation" >
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition" >
<property name="tickPosition">
<enum>QSlider::TicksAbove</enum>
</property>
<property name="tickInterval" >
<property name="tickInterval">
<number>100</number>
</property>
</widget>
</item>
<item row="3" column="0" >
<widget class="QLabel" name="strongLabel" >
<property name="text" >
<item row="3" column="0">
<widget class="QLabel" name="strongLabel">
<property name="text">
<string>Strong</string>
</property>
</widget>
</item>
<item row="3" column="2" >
<widget class="QSlider" name="strongSlider" >
<property name="minimum" >
<item row="3" column="2">
<widget class="QSlider" name="strongSlider">
<property name="minimum">
<number>5</number>
</property>
<property name="maximum" >
<property name="maximum">
<number>500</number>
</property>
<property name="orientation" >
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="tickPosition" >
<property name="tickPosition">
<enum>QSlider::TicksAbove</enum>
</property>
<property name="tickInterval" >
<property name="tickInterval">
<number>100</number>
</property>
</widget>
</item>
<item row="1" column="4" >
<widget class="UBCircleFrame" name="fineDisplayFrame" >
<property name="sizePolicy" >
<sizepolicy vsizetype="Fixed" hsizetype="Fixed" >
<item row="1" column="4">
<widget class="UBCircleFrame" name="fineDisplayFrame">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Fixed">
<horstretch>60</horstretch>
<verstretch>60</verstretch>
</sizepolicy>
</property>
<property name="minimumSize" >
<property name="minimumSize">
<size>
<width>60</width>
<height>60</height>
</size>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
</item>
<item row="2" column="4" >
<widget class="UBCircleFrame" name="mediumDisplayFrame" >
<property name="sizePolicy" >
<sizepolicy vsizetype="Fixed" hsizetype="Fixed" >
<item row="2" column="4">
<widget class="UBCircleFrame" name="mediumDisplayFrame">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Fixed">
<horstretch>60</horstretch>
<verstretch>60</verstretch>
</sizepolicy>
</property>
<property name="minimumSize" >
<property name="minimumSize">
<size>
<width>60</width>
<height>60</height>
</size>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
</item>
<item row="3" column="4" >
<widget class="UBCircleFrame" name="strongDisplayFrame" >
<property name="sizePolicy" >
<sizepolicy vsizetype="Fixed" hsizetype="Fixed" >
<item row="3" column="4">
<widget class="UBCircleFrame" name="strongDisplayFrame">
<property name="sizePolicy">
<sizepolicy hsizetype="Fixed" vsizetype="Fixed">
<horstretch>60</horstretch>
<verstretch>60</verstretch>
</sizepolicy>
</property>
<property name="minimumSize" >
<property name="minimumSize">
<size>
<width>60</width>
<height>60</height>
</size>
</property>
<property name="frameShape" >
<property name="frameShape">
<enum>QFrame::StyledPanel</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
</widget>
</item>
<item row="1" column="0" >
<widget class="QLabel" name="fineLabel" >
<property name="text" >
<item row="1" column="0">
<widget class="QLabel" name="fineLabel">
<property name="text">
<string>Fine</string>
</property>
</widget>
@ -446,50 +408,85 @@
</layout>
</widget>
</item>
<item row="5" column="0" colspan="3" >
<widget class="QFrame" name="pressureFrame" >
<property name="frameShape" >
<item row="3" column="1">
<spacer name="cSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>40</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="0">
<spacer name="nwSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="2">
<spacer name="neSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>0</width>
<height>0</height>
</size>
</property>
</spacer>
</item>
<item row="5" column="0" colspan="3">
<widget class="QFrame" name="pressureFrame">
<property name="frameShape">
<enum>QFrame::NoFrame</enum>
</property>
<property name="frameShadow" >
<property name="frameShadow">
<enum>QFrame::Raised</enum>
</property>
<layout class="QHBoxLayout" name="horizontalLayout_4" >
<property name="margin" >
<layout class="QHBoxLayout" name="horizontalLayout_4">
<property name="leftMargin">
<number>0</number>
</property>
<property name="topMargin">
<number>0</number>
</property>
<property name="rightMargin">
<number>0</number>
</property>
<property name="bottomMargin">
<number>0</number>
</property>
<item>
<spacer name="swSpacer" >
<property name="orientation" >
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QCheckBox" name="pressureSensitiveCheckBox" >
<property name="sizePolicy" >
<sizepolicy vsizetype="Fixed" hsizetype="MinimumExpanding" >
<widget class="QCheckBox" name="pressureSensitiveCheckBox">
<property name="sizePolicy">
<sizepolicy hsizetype="MinimumExpanding" vsizetype="Fixed">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text" >
<property name="text">
<string>Pen is Pressure Sensitive</string>
</property>
</widget>
</item>
<item>
<spacer name="seSpacer" >
<property name="orientation" >
<spacer name="seSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0" >
<property name="sizeHint" stdset="0">
<size>
<width>198</width>
<height>20</height>
@ -500,6 +497,30 @@
</layout>
</widget>
</item>
<item row="7" column="0" colspan="2">
<layout class="QHBoxLayout" name="interpolationFrame">
<item>
<widget class="QCheckBox" name="interpolateStrokesCheckBox">
<property name="text">
<string>Smooth strokes (experimental)</string>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_3">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
</layout>
</item>
</layout>
</widget>
<customwidgets>

2
src/core/UBPreferencesController.cpp
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@ -163,6 +163,7 @@ void UBPreferencesController::wire()
connect(mPenProperties->mediumSlider, SIGNAL(valueChanged(int)), this, SLOT(widthSliderChanged(int)));
connect(mPenProperties->strongSlider, SIGNAL(valueChanged(int)), this, SLOT(widthSliderChanged(int)));
connect(mPenProperties->pressureSensitiveCheckBox, SIGNAL(clicked(bool)), settings, SLOT(setPenPressureSensitive(bool)));
connect(mPenProperties->interpolateStrokesCheckBox, SIGNAL(clicked(bool)), settings->boardInterpolatePenStrokes, SLOT(setBool(bool)));
// marker
QList<QColor> markerLightBackgroundColors = settings->boardMarkerLightBackgroundColors->colors();
@ -229,6 +230,7 @@ void UBPreferencesController::init()
mPenProperties->mediumSlider->setValue(settings->boardPenMediumWidth->get().toDouble() * sSliderRatio);
mPenProperties->strongSlider->setValue(settings->boardPenStrongWidth->get().toDouble() * sSliderRatio);
mPenProperties->pressureSensitiveCheckBox->setChecked(settings->boardPenPressureSensitive->get().toBool());
mPenProperties->interpolateStrokesCheckBox->setChecked(settings->boardInterpolatePenStrokes->get().toBool());
// marker tab
mMarkerProperties->fineSlider->setValue(settings->boardMarkerFineWidth->get().toDouble() * sSliderRatio);

2
src/core/UBSettings.cpp
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@ -267,6 +267,8 @@ void UBSettings::init()
boardUseHighResTabletEvent = new UBSetting(this, "Board", "UseHighResTabletEvent", true);
boardInterpolatePenStrokes = new UBSetting(this, "Board", "InterpolatePenStrokes", true);
boardKeyboardPaletteKeyBtnSize = new UBSetting(this, "Board", "KeyboardPaletteKeyBtnSize", "16x16");
ValidateKeyboardPaletteKeyBtnSize();

2
src/core/UBSettings.h
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@ -269,6 +269,8 @@ class UBSettings : public QObject
UBSetting* boardUseHighResTabletEvent;
UBSetting* boardInterpolatePenStrokes;
UBSetting* boardKeyboardPaletteKeyBtnSize;
UBSetting* appStartMode;

88
src/domain/UBGraphicsScene.cpp
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@ -23,6 +23,7 @@
*/
#include <unistd.h>
#include "UBGraphicsScene.h"
@ -35,6 +36,7 @@
#include "frameworks/UBGeometryUtils.h"
#include "frameworks/UBPlatformUtils.h"
#include "frameworks/UBInterpolator.h"
#include "core/UBApplication.h"
#include "core/UBSettings.h"
@ -430,6 +432,8 @@ bool UBGraphicsScene::inputDevicePress(const QPointF& scenePos, const qreal& pre
else {
moveTo(scenePos);
drawLineTo(scenePos, width, UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Line);
mCurrentStroke->addPoint(scenePos);
}
accepted = true;
}
@ -537,7 +541,48 @@ bool UBGraphicsScene::inputDeviceMove(const QPointF& scenePos, const qreal& pres
dc->mActiveRuler->DrawLine(position, width);
}
else{
drawLineTo(position, width, UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Line);
bool showDots = false;
if (showDots) {
UBGraphicsPolygonItem * p = lineToPolygonItem(QLineF(scenePos, scenePos), width, width);
p->setColor(Qt::red);
this->addItem(p);
}
UBInterpolator::InterpolationMethod interpolator = UBInterpolator::NoInterpolation;
if (currentTool == UBStylusTool::Marker) {
// The marker is already super slow due to the transparency, we can't also do interpolation
interpolator = UBInterpolator::NoInterpolation;
}
else if (UBSettings::settings()->boardInterpolatePenStrokes->get().toBool()) {
interpolator = UBInterpolator::Bezier;
}
QList<QPointF> newPoints = mCurrentStroke->addPoint(scenePos, interpolator);
int n = newPoints.length();
int i = 1;
qreal startWidth = mPreviousWidth;
foreach(QPointF point, newPoints) {
if (showDots) {
if (point != scenePos) {
UBGraphicsPolygonItem * p = lineToPolygonItem(QLineF(point, point), width, width);
p->setColor(Qt::yellow);
this->addItem(p);
}
}
// linear interpolation of the end width
qreal endWidth = mPreviousWidth + qreal(i)*(width - mPreviousWidth)/qreal(n);
i++;
drawLineTo(point, startWidth, endWidth, UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Line);
startWidth = endWidth;
}
//drawLineTo(scenePos, width, UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Line);
}
}
else if (currentTool == UBStylusTool::Eraser)
@ -606,6 +651,30 @@ bool UBGraphicsScene::inputDeviceRelease()
mDrawWithCompass = false;
}
else if (mCurrentStroke){
/*
// -------------------------------------------------------------------------
// Replace the stroke by a smoother one
// -------------------------------------------------------------------------
UBGraphicsStroke* smoothStroke = mCurrentStroke->smoothe();
foreach(UBGraphicsPolygonItem* poly, mCurrentStroke->polygons()){
mPreviousPolygonItems.removeAll(poly);
removeItem(poly);
}
delete mCurrentStroke;
mCurrentStroke = smoothStroke;
moveTo(smoothStroke->points()[0]);
for (int i(1); i < smoothStroke->points().size(); ++i) {
QPointF currentPoint = smoothStroke->points()[i];
drawLineTo(currentPoint, dc->currentToolWidth(), dc->currentToolWidth(), false);
moveTo(currentPoint);
}
// -------------------------------------------------------------------------
*/
UBGraphicsStrokesGroup* pStrokes = new UBGraphicsStrokesGroup();
// Remove the strokes that were just drawn here and replace them by a stroke item
@ -771,15 +840,24 @@ void UBGraphicsScene::moveTo(const QPointF &pPoint)
mArcPolygonItem = 0;
mDrawWithCompass = false;
}
void UBGraphicsScene::drawLineTo(const QPointF &pEndPoint, const qreal &pWidth, bool bLineStyle)
{
drawLineTo(pEndPoint, pWidth, pWidth, bLineStyle);
}
void UBGraphicsScene::drawLineTo(const QPointF &pEndPoint, const qreal &startWidth, const qreal &endWidth, bool bLineStyle)
{
if (mPreviousWidth == -1.0)
mPreviousWidth = pWidth;
mPreviousWidth = startWidth;
qreal initialWidth = startWidth;
if (initialWidth == endWidth)
initialWidth = mPreviousWidth;
// UBGraphicsPolygonItem *polygonItem = lineToPolygonItem(QLineF(mPreviousPoint, pEndPoint), pWidth);
UBGraphicsPolygonItem *polygonItem = lineToPolygonItem(QLineF(mPreviousPoint, pEndPoint), mPreviousWidth,pWidth);
UBGraphicsPolygonItem *polygonItem = lineToPolygonItem(QLineF(mPreviousPoint, pEndPoint), initialWidth, endWidth);
if (!polygonItem->brush().isOpaque())
{
@ -822,7 +900,7 @@ void UBGraphicsScene::drawLineTo(const QPointF &pEndPoint, const qreal &pWidth,
if (!bLineStyle)
{
mPreviousPoint = pEndPoint;
mPreviousWidth = pWidth;
mPreviousWidth = endWidth;
}
}

1
src/domain/UBGraphicsScene.h
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@ -191,6 +191,7 @@ class UBGraphicsScene: public UBCoreGraphicsScene, public UBItem
void moveTo(const QPointF& pPoint);
void drawLineTo(const QPointF& pEndPoint, const qreal& pWidth, bool bLineStyle);
void drawLineTo(const QPointF& pEndPoint, const qreal& pStartWidth, const qreal& endWidth, bool bLineStyle);
void eraseLineTo(const QPointF& pEndPoint, const qreal& pWidth);
void drawArcTo(const QPointF& pCenterPoint, qreal pSpanAngle);

171
src/domain/UBGraphicsStroke.cpp
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@ -31,6 +31,7 @@
#include "core/memcheck.h"
UBGraphicsStroke::UBGraphicsStroke()
{
// NOOP
@ -61,6 +62,129 @@ QList<UBGraphicsPolygonItem*> UBGraphicsStroke::polygons() const
return mPolygons;
}
/**
* @brief Add a point to the curve, interpolating extra points if required
* @return The points (or point, if none were interpolated) that were added
*/
QList<QPointF> UBGraphicsStroke::addPoint(const QPointF& point, UBInterpolator::InterpolationMethod interpolationMethod)
{
int n = mDrawnPoints.size();
/*
if (n > 0) {
qreal MIN_DISTANCE = 3;
QPointF lastPoint = mDrawnPoints.last();
qreal distance = QLineF(lastPoint, point).length();
//qDebug() << "distance: " << distance;
if (distance < MIN_DISTANCE)
return QList<QPointF>();
}
*/
if (interpolationMethod == UBInterpolator::NoInterpolation || n == 0) {
mDrawnPoints << point;
mAllPoints << point;
return QList<QPointF>() << point;
}
else if (interpolationMethod == UBInterpolator::Bezier) {
// This is a bit special, as the curve we are interpolating is not between two drawn points;
// it is between the midway points of the second-to-last and last point, and last and current point.
qreal MIN_DISTANCE = 3;
QPointF lastPoint = mDrawnPoints.last();
qreal distance = QLineF(lastPoint, point).length();
//qDebug() << "distance: " << distance;
if (distance < MIN_DISTANCE)
return QList<QPointF>();
if (n == 1) {
// We start with a straight line to the first midway point
QPointF lastPoint = mDrawnPoints[0];
mDrawnPoints << point;
return QList<QPointF>() << ((lastPoint + point)/2.0);
}
QPointF p0 = mDrawnPoints[mDrawnPoints.size() - 2];
QPointF p1 = mDrawnPoints[mDrawnPoints.size() - 1];
QPointF p2 = point;
UBQuadraticBezier bz;
QPointF startPoint = (p1+p0)/2.0;
QPointF endPoint = (p2+p1)/2.0;
bz.setPoints(startPoint, p1, endPoint);
QList<QPointF> newPoints = bz.getPoints(7);
foreach(QPointF p, newPoints) {
mAllPoints << p;
}
mDrawnPoints << point;
return newPoints;
}
else {
qreal MIN_INTERPOLATION_DISTANCE = 0;
QPointF lastPoint;
if (!mDrawnPoints.isEmpty())
lastPoint = mDrawnPoints.last();
QList<QPointF> newPoints;
// Interpolation
if (n > 3 && QLineF(lastPoint, point).length() > MIN_INTERPOLATION_DISTANCE) {
/*
UBSimpleSpline sp;
sp.setPoints(mDrawnPoints[n-2], mDrawnPoints[n-1], point);
*/
// todo: better way of avoiding problems with constant x's. in the meantime this'll do.
qreal x0 = mDrawnPoints[n-3].x();
qreal x1 = mDrawnPoints[n-2].x();
qreal x2 = mDrawnPoints[n-1].x();
qreal x3 = point.x();
if (!(x0 == x1 || x0 == x2 || x0 == x3 || x1 == x2 || x1 == x3 || x2 == x3)) {
UBCatmullRomSpline sp;
sp.setPoints(QList<QPointF>() << mDrawnPoints[n-3] << mDrawnPoints[n-2] << mDrawnPoints[n-1] << point);
// get an extra 3 values in between the current point and last one
int n_points = 3; // number of points to interpolate
double interval = (point.x() - lastPoint.x())/double(n_points+1);
qDebug() << "Interpolating between: " << lastPoint << " and " << point;
for (int i(1); i <= n_points; ++i) {
double x = lastPoint.x() + i*interval;
QPointF newPoint(x, sp.y(x));
qDebug() << newPoint;
newPoints << newPoint;
mAllPoints << newPoint;
//qDebug() << "Got new point: " << newPoint;
}
}
}
newPoints << point;
mAllPoints << point;
mDrawnPoints << point;
return newPoints;
}
}
bool UBGraphicsStroke::hasPressure()
{
@ -105,3 +229,50 @@ void UBGraphicsStroke::clear()
}
}
/**
* @brief Smoothe the curve, by interpolating extra points where needed.
*
* @return A new stroke based on the current one.
*/
UBGraphicsStroke* UBGraphicsStroke::smoothe()
{
// Catmull-Rom spline interpolation
UBCatmullRomSpline sp;
UBGraphicsStroke * smoothStroke = new UBGraphicsStroke();
smoothStroke->mAllPoints << mAllPoints[0];
for (int i(0); i < mAllPoints.size() - 3; ++i) {
QPointF p1, p2;
p1 = mAllPoints[i+1];
p2 = mAllPoints[i+2];
qreal x0 = mAllPoints[i].x();
qreal x1 = p1.x();
qreal x2 = p2.x();
qreal x3 = mAllPoints[i+3].x();
if (!(x0 == x1 || x0 == x2 || x0 == x3 || x1 == x2 || x1 == x3 || x2 == x3)) {
sp.setPoints(QList<QPointF>() << mAllPoints[i] << mAllPoints[i+1] << mAllPoints[i+2] << mAllPoints[i+3]);
smoothStroke->mAllPoints << mAllPoints[i+1];
int n_points = 3; // number of points to interpolate
double interval = (p2.x() - p1.x())/double(n_points+1);
for (int i(1); i <= n_points; ++i) {
double x = p1.x() + i*interval;
QPointF newPoint(x, sp.y(x));
smoothStroke->mAllPoints << newPoint;
}
}
}
smoothStroke->mAllPoints << mAllPoints[mAllPoints.size() - 2] << mAllPoints[mAllPoints.size() - 1];
return smoothStroke;
}

11
src/domain/UBGraphicsStroke.h
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@ -31,6 +31,8 @@
#include <QtGui>
#include "core/UB.h"
#include "frameworks/UBInterpolator.h"
class UBGraphicsPolygonItem;
@ -55,6 +57,12 @@ class UBGraphicsStroke
void clear();
QList<QPointF> addPoint(const QPointF& point, UBInterpolator::InterpolationMethod interpolationMethod = UBInterpolator::NoInterpolation);
UBGraphicsStroke* smoothe();
const QList<QPointF>& points() { return mAllPoints; }
protected:
void addPolygon(UBGraphicsPolygonItem* pol);
@ -62,6 +70,9 @@ class UBGraphicsStroke
QList<UBGraphicsPolygonItem*> mPolygons;
QList<QPointF> mDrawnPoints;
QList<QPointF> mAllPoints;
};
#endif /* UBGRAPHICSSTROKE_H_ */

139
src/frameworks/UBInterpolator.cpp
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@ -0,0 +1,139 @@
#include "UBInterpolator.h"
UBInterpolator::UBInterpolator()
{
}
UBInterpolator::~UBInterpolator()
{
}
UBSimpleSpline::UBSimpleSpline()
{
}
void UBSimpleSpline::setPoints(QList<QPointF> points)
{
setPoints(points[0], points[1], points[2]);
}
void UBSimpleSpline::setPoints(QPointF p0, QPointF p1, QPointF p2)
{
/*
p0 -= p0;
p1 -= p0;
p2 -= p0;
*/
long double x0, x1, x2, y0, y1, y2;
x0 = p0.x();
x1 = p1.x();
x2 = p2.x();
y0 = p0.y();
y1 = p1.y();
y2 = p2.y();
long double k1 = (y2-y0)/(x2-x0);
m_a = (y1-y2-k1*(x1-x2))/(pow(x1,3) - pow(x2,3) - 3*x2*(pow(x1,2)-pow(x2,2)) -
3*(pow(x1,2) - 2*x1*x2)*(x1-x2));
m_b = -3*m_a*x2;
m_c = k1 - 3*m_a*pow(x1,2) - 2*m_b*x1;
m_d = y1 - m_a*pow(x1,3) - m_b*pow(x1,2) - m_c*x1;
}
double UBSimpleSpline::y(double x)
{
return m_a*pow(x, 3) + m_b*pow(x, 2) + m_c*x + m_d;
}
UBCatmullRomSpline::UBCatmullRomSpline()
{
mInterpolant = 0;
}
UBCatmullRomSpline::~UBCatmullRomSpline()
{
if (mInterpolant)
delete mInterpolant;
}
void UBCatmullRomSpline::setPoints(QList<QPointF> points)
{
// todo : basis change to avoid crashing when several X's are equal
mInterpolant = new alglib::spline1dinterpolant();
// alglib arrays are defined as strings
QString x = "[";
QString y = "[";
foreach(QPointF point, points) {
x += (QString::number(point.x()) + QString(","));
y += (QString::number(point.y()) + QString(","));
}
x.chop(1);
y.chop(1);
x+="]";
y+="]";
alglib::real_1d_array xArray = x.toLatin1().data();
alglib::real_1d_array yArray = y.toLatin1().data();
alglib::spline1dbuildcatmullrom(xArray, yArray, *mInterpolant);
}
double UBCatmullRomSpline::y(double x)
{
return alglib::spline1dcalc(*mInterpolant, x);
}
UBQuadraticBezier::UBQuadraticBezier()
{
mPath = 0;
}
UBQuadraticBezier::~UBQuadraticBezier()
{
if (mPath)
delete mPath;
}
void UBQuadraticBezier::setPoints(QList<QPointF> points)
{
setPoints(points[0], points[1], points[2]);
}
void UBQuadraticBezier::setPoints(QPointF start, QPointF control, QPointF end)
{
mPath = new QPainterPath(start);
mPath->quadTo(control, end);
}
/**
* @brief Return n points along the curve, including start and end points (thus n should be larger than or equal to 2).
*
* The higher n, the more accurate the result
*/
QList<QPointF> UBQuadraticBezier::getPoints(int n)
{
QList<QPointF> points;
if (n <= 1)
return points;
for (int i(0); i <= n; ++i) {
qreal percent = qreal(i)/qreal(n);
points << mPath->pointAtPercent(percent);
}
return points;
}

96
src/frameworks/UBInterpolator.h
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@ -0,0 +1,96 @@
#ifndef UBINTERPOLATOR_H
#define UBINTERPOLATOR_H
#include <QtGui>
#include "spline.h"
#include "interpolation.h"
class UBInterpolator
{
/* Abstract class representing an interpolator */
public:
enum InterpolationMethod {
NoInterpolation,
SimpleSpline,
CatmullRom,
Bezier
};
UBInterpolator();
virtual ~UBInterpolator();
virtual void setPoints(QList<QPointF> points) = 0;
virtual double y(double x) {}
};
class UBSimpleSpline : public UBInterpolator
{
/* A basic cubic spline interpolator, that requires only three
* points to interpolate between the second and third one.
* To do so, the curvature at p2 is set to 0, so the resulting
* curve is not very smooth.
* However, it is better than linear interpolation and requires no
* "future" points, so it can be used seamlessly during drawing.
*/
public:
UBSimpleSpline();
virtual ~UBSimpleSpline() {}
virtual void setPoints(QList<QPointF> points);
void setPoints(QPointF p0, QPointF p1, QPointF p2);
virtual double y(double x);
private:
long double m_a,
m_b,
m_c,
m_d;
};
class UBCatmullRomSpline : public UBInterpolator
{
/* Catmull-Rom spline, using AlgLib as backend
*
* This requires four points to interpolate between the middle two.
*/
public:
UBCatmullRomSpline();
virtual ~UBCatmullRomSpline();
virtual void setPoints(QList<QPointF> points);
virtual double y(double x);
private:
alglib::spline1dinterpolant * mInterpolant;
};
class UBQuadraticBezier : public UBInterpolator
{
public:
UBQuadraticBezier();
virtual ~UBQuadraticBezier();
virtual void setPoints(QList<QPointF> points);
void setPoints(QPointF start, QPointF control, QPointF end);
//virtual double y(double x);
QList<QPointF> getPoints(int n);
private:
QPainterPath* mPath;
};
#endif // UBINTERPOLATOR_H

6
src/frameworks/frameworks.pri
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@ -6,7 +6,8 @@ HEADERS += src/frameworks/UBGeometryUtils.h \
src/frameworks/UBVersion.h \
src/frameworks/UBCoreGraphicsScene.h \
src/frameworks/UBCryptoUtils.h \
src/frameworks/UBBase32.h
src/frameworks/UBBase32.h \
$$PWD/UBInterpolator.h
SOURCES += src/frameworks/UBGeometryUtils.cpp \
src/frameworks/UBPlatformUtils.cpp \
@ -15,7 +16,8 @@ SOURCES += src/frameworks/UBGeometryUtils.cpp \
src/frameworks/UBVersion.cpp \
src/frameworks/UBCoreGraphicsScene.cpp \
src/frameworks/UBCryptoUtils.cpp \
src/frameworks/UBBase32.cpp
src/frameworks/UBBase32.cpp \
$$PWD/UBInterpolator.cpp
win32 {

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