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LibGfx: Add Gfx::Path, a basic 2D path with <canvas> semantics

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This will be used to implement painting of 2D paths. This first patch
adds support for line_to(), move_to() and close().

It will try to have the same semantics as the HTML <canvas> element.

To stroke a Path, simply pass it to Painter::stroke_path().
This commit is contained in:
Andreas Kling 2020-04-16 21:03:17 +02:00
parent 72df9c7417
commit 60c2e41079
6 changed files with 176 additions and 0 deletions
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76
Libraries/LibGfx/Path.cpp Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* 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 HOLDER 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.
*/
#include <AK/StringBuilder.h>
#include <LibGfx/Path.h>
namespace Gfx {
void Path::close()
{
if (m_segments.size() <= 1)
return;
auto& last_point = m_segments.last().point;
for (ssize_t i = m_segments.size() - 1; i >= 0; --i) {
auto& segment = m_segments[i];
if (segment.type == Segment::Type::MoveTo) {
if (last_point == segment.point)
return;
m_segments.append({ Segment::Type::LineTo, segment.point });
return;
}
}
}
String Path::to_string() const
{
StringBuilder builder;
builder.append("Path { ");
for (auto& segment : m_segments) {
switch (segment.type) {
case Segment::Type::MoveTo:
builder.append("MoveTo");
break;
case Segment::Type::LineTo:
builder.append("LineTo");
break;
case Segment::Type::Invalid:
builder.append("Invalid");
break;
}
builder.append('(');
builder.append(segment.point.to_string());
builder.append(')');
builder.append(' ');
}
builder.append("}");
return builder.to_string();
}
}