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Paint Button in a very Windows 3-ish style.

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This commit is contained in:
Andreas Kling 2018-10-12 14:58:16 +02:00
parent 16576112b0
commit 5412dac05d
3 changed files with 84 additions and 1 deletions
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53
Widgets/Painter.cpp
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@ -125,3 +125,56 @@ void Painter::drawText(const Rect& rect, const String& text, TextAlignment align
}
}
void Painter::drawPixel(const Point& p, Color color)
{
auto point = p;
point.moveBy(m_translation);
scanline(point.y())[point.x()] = color.value();
}
void Painter::drawLine(const Point& p1, const Point& p2, Color color)
{
auto point1 = p1;
point1.moveBy(m_translation);
auto point2 = p2;
point2.moveBy(m_translation);
// Special case: vertical line.
if (point1.x() == point2.x()) {
if (point1.y() > point2.y())
std::swap(point1, point2);
for (int y = point1.y(); y <= point2.y(); ++y)
scanline(y)[point1.x()] = color.value();
return;
}
if (point1.x() > point2.x())
std::swap(point1, point2);
// Special case: horizontal line.
if (point1.y() == point2.y()) {
if (point1.y() > point2.y())
std::swap(point1, point2);
auto* pixels = scanline(point1.y());
for (int x = point1.x(); x <= point2.x(); ++x)
pixels[x] = color.value();
return;
}
const double dx = point2.x() - point1.x();
const double dy = point2.y() - point1.y();
const double deltaError = fabs(dy / dx);
double error = 0;
const double yStep = dy == 0 ? 0 : (dy > 0 ? 1 : -1);
int y = point1.y();
for (int x = point1.x(); x <= point2.x(); ++x) {
scanline(y)[x] = color.value();
error += deltaError;
if (error >= 0.5) {
y = (double)y + yStep;
error -= 1.0;
}
}
}