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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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21
Libraries/LibGfx/Painter.cpp
View file

@ -35,6 +35,7 @@
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
#include <LibGfx/CharacterBitmap.h>
#include <LibGfx/Path.h>
#include <math.h>
#include <stdio.h>
#include <unistd.h>
@ -1010,4 +1011,24 @@ PainterStateSaver::~PainterStateSaver()
m_painter.restore();
}
void Painter::stroke_path(const Path& path, Color color, int thickness)
{
FloatPoint cursor;
for (auto& segment : path.segments()) {
switch (segment.type) {
case Path::Segment::Type::Invalid:
ASSERT_NOT_REACHED();
break;
case Path::Segment::Type::MoveTo:
cursor = segment.point;
break;
case Path::Segment::Type::LineTo:
draw_line(Point(cursor.x(), cursor.y()), Point(segment.point.x(), segment.point.y()), color, thickness);
cursor = segment.point;
break;
}
}
}
}