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Paint Button in a very Windows 3-ish style.
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16576112b0
commit
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3 changed files with 84 additions and 1 deletions
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@ -125,3 +125,56 @@ void Painter::drawText(const Rect& rect, const String& text, TextAlignment align
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}
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}
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void Painter::drawPixel(const Point& p, Color color)
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{
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auto point = p;
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point.moveBy(m_translation);
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scanline(point.y())[point.x()] = color.value();
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}
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void Painter::drawLine(const Point& p1, const Point& p2, Color color)
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{
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auto point1 = p1;
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point1.moveBy(m_translation);
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auto point2 = p2;
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point2.moveBy(m_translation);
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// Special case: vertical line.
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if (point1.x() == point2.x()) {
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if (point1.y() > point2.y())
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std::swap(point1, point2);
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for (int y = point1.y(); y <= point2.y(); ++y)
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scanline(y)[point1.x()] = color.value();
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return;
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}
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if (point1.x() > point2.x())
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std::swap(point1, point2);
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// Special case: horizontal line.
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if (point1.y() == point2.y()) {
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if (point1.y() > point2.y())
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std::swap(point1, point2);
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auto* pixels = scanline(point1.y());
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for (int x = point1.x(); x <= point2.x(); ++x)
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pixels[x] = color.value();
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return;
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}
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const double dx = point2.x() - point1.x();
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const double dy = point2.y() - point1.y();
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const double deltaError = fabs(dy / dx);
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double error = 0;
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const double yStep = dy == 0 ? 0 : (dy > 0 ? 1 : -1);
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int y = point1.y();
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for (int x = point1.x(); x <= point2.x(); ++x) {
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scanline(y)[x] = color.value();
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error += deltaError;
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if (error >= 0.5) {
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y = (double)y + yStep;
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error -= 1.0;
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}
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}
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}
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