TouchCanvas: Version 2.1, 2017-11-16

Modernize Swift.

Signed-off-by: Liu Lantao <liulantao@gmail.com>

Author: Lax

TouchCanvas/.gitignore

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+.DS_Store
+
+# Xcode
+build/*
+*/build/*
+*/**/build/*
+*.mode1
+*.pbxuser
+*.perspective
+!default.perspectivev3
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+*.xcworkspace
+!default.xcworkspace
+xcuserdata
+profile
+*.moved-aside
+
+# Generated files
+VersionX-revision.h
+
+# build products
+build/
+*.[oa]
+
+# version control files
+.hg
+.svn
+CVS
+
+# automatic backup files
+*~.nib
+*.swp
+*~
+*(Autosaved).rtfd/
+Backup[ ]of[ ]*.pages/
+Backup[ ]of[ ]*.key/
+Backup[ ]of[ ]*.numbers/

TouchCanvas/LICENSE.txt

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+Sample code project: TouchCanvas: Using UITouch efficiently and effectively
+Version: 2.1
+
+IMPORTANT:  This Apple software is supplied to you by Apple
+Inc. ("Apple") in consideration of your agreement to the following
+terms, and your use, installation, modification or redistribution of
+this Apple software constitutes acceptance of these terms.  If you do
+not agree with these terms, please do not use, install, modify or
+redistribute this Apple software.
+
+In consideration of your agreement to abide by the following terms, and
+subject to these terms, Apple grants you a personal, non-exclusive
+license, under Apple's copyrights in this original Apple software (the
+"Apple Software"), to use, reproduce, modify and redistribute the Apple
+Software, with or without modifications, in source and/or binary forms;
+provided that if you redistribute the Apple Software in its entirety and
+without modifications, you must retain this notice and the following
+text and disclaimers in all such redistributions of the Apple Software.
+Neither the name, trademarks, service marks or logos of Apple Inc. may
+be used to endorse or promote products derived from the Apple Software
+without specific prior written permission from Apple.  Except as
+expressly stated in this notice, no other rights or licenses, express or
+implied, are granted by Apple herein, including but not limited to any
+patent rights that may be infringed by your derivative works or by other
+works in which the Apple Software may be incorporated.
+
+The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+
+IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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+
+Copyright (C) 2017 Apple Inc. All Rights Reserved.

TouchCanvas/README.md

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+# TouchCanvas: Using UITouch efficiently and effectively
+
+TouchCanvas illustrates responsive touch handling using coalesced and predictive touches (when available) via a simple drawing app. The sample uses force information (when available) to change line thickness. Apple Pencil and finger touches are distinguished via different colors. In addition, Apple Pencil only data is demonstrated through the use of estimated properties and updates providing the actual property data including the azimuth and altitude of the Apple Pencil while in use.
+
+The sample includes a debug and precise options as follows:
+
+* precise will force the use of UITouch's preciseLocation method over UITouch's location method for retrieving more precise screen coordinates.
+* debug will draw the lines displayed in different colors depending on properties gathered from the UITouch APIs.  See the enclosed LinePoint class in Line.swift.
+
+## Requirements
+
+### Build
+
+Xcode 9.0 or later, iOS 10.0 SDK or later
+
+### Runtime
+
+iOS 9.1
+
+### Changes
+
+version 2.1 - updated to Swift 4.0
+version 2.0 - first release
+
+Copyright (C) 2017 Apple Inc. All rights reserved.
+