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Clearer function, arguable justification for using WorkerScript, and fits better into the standrad form factor. Change-Id: I3f29f19961a12adc29b260b3284eb620ad63bf45 Reviewed-by: Chris Adams <christopher.adams@nokia.com>
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Alan Alpert
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Qt by Nokia
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Mar 20, 2012
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/**************************************************************************** | ||
** | ||
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). | ||
** Contact: http://www.qt-project.org/ | ||
** | ||
** This file is part of the examples of the Qt Toolkit. | ||
** | ||
** $QT_BEGIN_LICENSE:BSD$ | ||
** 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 Nokia Corporation and its Subsidiary(-ies) 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." | ||
** | ||
** $QT_END_LICENSE$ | ||
** | ||
****************************************************************************/ | ||
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import QtQuick 2.0 | ||
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Rectangle { | ||
width: 64 | ||
height: 64 | ||
property alias value: list.currentIndex | ||
property alias label: caption.text | ||
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Text { | ||
id: caption | ||
text: "Spinner" | ||
anchors.horizontalCenter: parent.horizontalCenter | ||
} | ||
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Rectangle { | ||
anchors.top: caption.bottom | ||
anchors.topMargin: 4 | ||
anchors.horizontalCenter: parent.horizontalCenter | ||
height: 48 | ||
width: 32 | ||
color: "black" | ||
ListView { | ||
id: list | ||
anchors.fill: parent | ||
highlightRangeMode: ListView.StrictlyEnforceRange | ||
preferredHighlightBegin: height/3 | ||
preferredHighlightEnd: height/3 | ||
clip: true | ||
model: 64 | ||
delegate: Text { | ||
font.pixelSize: 18; | ||
color: "white"; | ||
text: index; | ||
anchors.horizontalCenter: parent.horizontalCenter | ||
} | ||
} | ||
Rectangle { | ||
anchors.fill: parent | ||
gradient: Gradient { | ||
GradientStop { position: 0.0; color: "#FF000000" } | ||
GradientStop { position: 0.2; color: "#00000000" } | ||
GradientStop { position: 0.8; color: "#00000000" } | ||
GradientStop { position: 1.0; color: "#FF000000" } | ||
} | ||
} | ||
} | ||
} |
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var lastx = 0; | ||
var lasty = 0; | ||
//Will be initialized when WorkerScript{} is instantiated | ||
var cache = new Array(64); | ||
for (var i = 0; i < 64; i++) | ||
cache[i] = new Array(64); | ||
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WorkerScript.onMessage = function(message) { | ||
var ydiff = message.y - lasty; | ||
var xdiff = message.x - lastx; | ||
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var total = Math.sqrt(ydiff * ydiff + xdiff * xdiff); | ||
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lastx = message.x; | ||
lasty = message.y; | ||
function triangle(row, column) { | ||
if (cache[row][column]) | ||
return cache[row][column] | ||
if (column < 0 || column > row) | ||
return -1; | ||
if (column == 0 || column == row) | ||
return 1; | ||
return triangle(row-1, column-1) + triangle(row-1, column); | ||
} | ||
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WorkerScript.sendMessage( {xmove: xdiff, ymove: ydiff, move: total} ); | ||
WorkerScript.onMessage = function(message) { | ||
//Calculate result (may take a while, using a naive algorithm) | ||
var calculatedResult = triangle(message.row, message.column); | ||
//Send result back to main thread | ||
WorkerScript.sendMessage( { row: message.row, | ||
column: message.column, | ||
result: calculatedResult} ); | ||
} | ||
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