Add an interactive PathItem example

Change-Id: I1ddfba07e80cd0315a2ef85c85a568636f8e808a
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

4 files changed, 289 insertions, 0 deletions

diff --git a/examples/quick/pathitem/content/pathitem.qml b/examples/quick/pathitem/content/pathitem.qml
index b82d51a13c..e1fae2bbe2 100644
--- a/examples/quick/pathitem/content/pathitem.qml
+++ b/examples/quick/pathitem/content/pathitem.qml
@@ -57,6 +57,7 @@ Item {
         anchors.fill: parent
         Component.onCompleted: {
             addExample("PathItem Gallery", "Simple path rendering examples", Qt.resolvedUrl("pathitemgallery.qml"))
+            addExample("Interactive PathItem", "Dynamic, interactive path rendering examples", Qt.resolvedUrl("pathiteminteract.qml"))
             addExample("Super- and multisampling", "Improving quality", Qt.resolvedUrl("pathitemsampling.qml"))
             addExample("Clip My Tiger!", "Clip examples, a.k.a. What Not To Do", Qt.resolvedUrl("pathitemtigers.qml"))
         }
diff --git a/examples/quick/pathitem/content/pathiteminteract.qml b/examples/quick/pathitem/content/pathiteminteract.qml
new file mode 100644
index 0000000000..219683b558
--- /dev/null
+++ b/examples/quick/pathitem/content/pathiteminteract.qml
@@ -0,0 +1,284 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * 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.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "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 COPYRIGHT
+** OWNER OR CONTRIBUTORS 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.9 // to get PathItem
+
+Rectangle {
+    id: root
+    width: 1024
+    height: 768
+
+    property color col: "lightsteelblue"
+    gradient: Gradient {
+        GradientStop { position: 0.0; color: Qt.tint(root.col, "#20FFFFFF") }
+        GradientStop { position: 0.1; color: Qt.tint(root.col, "#20AAAAAA") }
+        GradientStop { position: 0.9; color: Qt.tint(root.col, "#20666666") }
+        GradientStop { position: 1.0; color: Qt.tint(root.col, "#20000000") }
+    }
+
+    property int mode: 0
+    property bool showResizers: true
+    property bool fill: false
+
+    Row {
+        x: 20
+        y: 10
+        spacing: 20
+        Rectangle {
+            border.color: "black"
+            color: root.mode === 0 ? "red" : "transparent"
+            width: 100
+            height: 40
+            Text {
+                anchors.centerIn: parent
+                text: "Line"
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: root.mode = 0
+            }
+        }
+        Rectangle {
+            border.color: "black"
+            color: root.mode === 1 ? "red" : "transparent"
+            width: 100
+            height: 40
+            Text {
+                anchors.centerIn: parent
+                text: "Cubic"
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: root.mode = 1
+            }
+        }
+        Rectangle {
+            border.color: "black"
+            color: root.mode === 2 ? "red" : "transparent"
+            width: 100
+            height: 40
+            Text {
+                anchors.centerIn: parent
+                text: "Quadratic"
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: root.mode = 2
+            }
+        }
+
+        Slider {
+            id: widthSlider
+            name: "Width"
+            min: 1
+            max: 60
+            init: 4
+        }
+
+        Rectangle {
+            border.color: "black"
+            color: root.showResizers ? "yellow" : "transparent"
+            width: 50
+            height: 40
+            Text {
+                anchors.centerIn: parent
+                text: "Manip"
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: {
+                    root.showResizers = !root.showResizers;
+                    for (var i = 0; i < canvas.resizers.length; ++i)
+                        canvas.resizers[i].visible = root.showResizers;
+                }
+            }
+        }
+
+        Rectangle {
+            border.color: "black"
+            color: root.fill ? "yellow" : "transparent"
+            width: 50
+            height: 40
+            Text {
+                anchors.centerIn: parent
+                text: "Fill"
+            }
+            MouseArea {
+                anchors.fill: parent
+                onClicked: root.fill = !root.fill
+            }
+        }
+    }
+
+    Rectangle {
+        id: canvas
+        width: root.width - 40
+        height: root.height - 120
+        x: 20
+        y: 100
+
+        property variant activePath: null
+
+        property variant resizers: []
+        property variant funcs
+
+        function genResizer(obj, x, y, xprop, yprop, color) {
+            var ma = Qt.createQmlObject('import QtQuick 2.9; Rectangle { id: rr; property variant obj; color: "' + color + '"; width: 20; height: 20;'+
+                                         'MouseArea { anchors.fill: parent; hoverEnabled: true;' +
+                                         'onEntered: color = "yellow"; onExited: color = "' + color + '";' +
+                                         'property bool a: false; onPressed: a = true; onReleased: a = false; ' +
+                                         'onPositionChanged: if (a) { var pt = mapToItem(rr.parent, mouse.x, mouse.y);' +
+                                         'obj.' + xprop + ' = pt.x; obj.' + yprop + ' = pt.y; rr.x = pt.x - 10; rr.y = pt.y - 10; } } }',
+                                         canvas, "resizer_item");
+            ma.visible = root.showResizers;
+            ma.obj = obj;
+            ma.x = x - 10;
+            ma.y = y - 10;
+            resizers.push(ma);
+            return ma;
+        }
+
+        Component.onCompleted: {
+            funcs = [
+                        { "start": function(x, y) {
+                            var p = Qt.createQmlObject('import QtQuick 2.9; VisualPath {' +
+                                                       'strokeColor: "black"; fillColor: "transparent";'+
+                                                       'strokeWidth: ' + widthSlider.value + ';' +
+                                                       'Path { startX: ' + x + '; startY: ' + y + ';' +
+                                                       'PathLine { x: ' + x + ' + 1; y: ' + y + ' + 1 } } }',
+                                                       root, "dynamic_visual_path");
+                            pathItem.elements.push(p);
+                            activePath = p;
+                        }, "move": function(x, y) {
+                            if (!activePath)
+                                return;
+                            var pathObj = activePath.path.pathElements[0];
+                            pathObj.x = x;
+                            pathObj.y = y;
+                        }, "end": function() {
+                            canvas.genResizer(activePath.path, activePath.path.startX, activePath.path.startY, "startX", "startY", "red");
+                            var pathObj = activePath.path.pathElements[0];
+                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
+                            activePath = null;
+                        }
+                        },
+                        { "start": function(x, y) {
+                            var p = Qt.createQmlObject('import QtQuick 2.9; VisualPath {' +
+                                                       'strokeColor: "black"; fillColor: "' + (root.fill ? 'green' : 'transparent') + '";'+
+                                                       'strokeWidth: ' + widthSlider.value + ';' +
+                                                       'Path { startX: ' + x + '; startY: ' + y + ';' +
+                                                       'PathCubic { x: ' + x + ' + 1; y: ' + y + ' + 1;' +
+                                                       'control1X: ' + x + ' + 50; control1Y: ' + y + ' + 50; control2X: ' + x + ' + 150; control2Y: ' + y + ' + 50; } } }',
+                                                       root, "dynamic_visual_path");
+                            pathItem.elements.push(p);
+                            activePath = p;
+                        }, "move": function(x, y) {
+                            if (!activePath)
+                                return;
+                            var pathObj = activePath.path.pathElements[0];
+                            pathObj.x = x;
+                            pathObj.y = y;
+                        }, "end": function() {
+                            canvas.genResizer(activePath.path, activePath.path.startX, activePath.path.startY, "startX", "startY", "red");
+                            var pathObj = activePath.path.pathElements[0];
+                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
+                            canvas.genResizer(pathObj, pathObj.control1X, pathObj.control1Y, "control1X", "control1Y", "blue");
+                            canvas.genResizer(pathObj, pathObj.control2X, pathObj.control2Y, "control2X", "control2Y", "lightBlue");
+                            activePath = null;
+                        }
+                        },
+                        { "start": function(x, y) {
+                            var p = Qt.createQmlObject('import QtQuick 2.9; VisualPath {' +
+                                                       'strokeColor: "black"; fillColor: "' + (root.fill ? 'green' : 'transparent') + '";'+
+                                                       'strokeWidth: ' + widthSlider.value + ';' +
+                                                       'Path { startX: ' + x + '; startY: ' + y + ';' +
+                                                       'PathQuad { x: ' + x + ' + 1; y: ' + y + ' + 1;' +
+                                                       'controlX: ' + x + ' + 50; controlY: ' + y + ' + 50 } } }',
+                                                       root, "dynamic_visual_path");
+                            pathItem.elements.push(p);
+                            activePath = p;
+                        }, "move": function(x, y) {
+                            if (!activePath)
+                                return;
+                            var pathObj = activePath.path.pathElements[0];
+                            pathObj.x = x;
+                            pathObj.y = y;
+                        }, "end": function() {
+                            canvas.genResizer(activePath.path, activePath.path.startX, activePath.path.startY, "startX", "startY", "red");
+                            var pathObj = activePath.path.pathElements[0];
+                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
+                            canvas.genResizer(pathObj, pathObj.controlX, pathObj.controlY, "controlX", "controlY", "blue");
+                            activePath = null;
+                        }
+                        }
+                    ];
+        }
+
+        MouseArea {
+            anchors.fill: parent
+            onPressed: {
+                canvas.funcs[root.mode].start(mouse.x, mouse.y);
+            }
+            onPositionChanged: {
+                canvas.funcs[root.mode].move(mouse.x, mouse.y);
+            }
+            onReleased: {
+                canvas.funcs[root.mode].end();
+            }
+        }
+
+        PathItem {
+            id: pathItem
+            anchors.fill: parent
+
+            elements: []
+        }
+    }
+}
diff --git a/examples/quick/pathitem/pathitem.pro b/examples/quick/pathitem/pathitem.pro
index 333b84176d..b0ff0537cf 100644
--- a/examples/quick/pathitem/pathitem.pro
+++ b/examples/quick/pathitem/pathitem.pro
@@ -5,6 +5,7 @@ SOURCES += main.cpp
 RESOURCES += pathitem.qrc
 OTHER_FILES += content/pathitem.qml \
                content/pathitemgallery.qml \
+               content/pathiteminteract.qml \
                content/pathitemsampling.qml \
                content/pathitemtigers.qml \
                content/tiger.qml \
diff --git a/examples/quick/pathitem/pathitem.qrc b/examples/quick/pathitem/pathitem.qrc
index 83984b5e87..533ba090bc 100644
--- a/examples/quick/pathitem/pathitem.qrc
+++ b/examples/quick/pathitem/pathitem.qrc
@@ -4,8 +4,11 @@
         <file alias="SimpleLauncherDelegate.qml">../shared/SimpleLauncherDelegate.qml</file>
         <file alias="images/next.png">../shared/images/next.png</file>
         <file alias="images/back.png">../shared/images/back.png</file>
+        <file alias="images/slider_handle.png">../shared/images/slider_handle.png</file>
+        <file alias="Slider.qml">../shared/Slider.qml</file>
         <file alias="pathitem.qml">content/pathitem.qml</file>
         <file alias="pathitemgallery.qml">content/pathitemgallery.qml</file>
+        <file alias="pathiteminteract.qml">content/pathiteminteract.qml</file>
         <file alias="pathitemsampling.qml">content/pathitemsampling.qml</file>
         <file alias="pathitemtigers.qml">content/pathitemtigers.qml</file>
         <file alias="tiger.qml">content/tiger.qml</file>