90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
#include "strokecanvasrenderer.hpp"
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#include "strokecanvasitem.hpp"
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namespace ZShell::internal {
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static void drawStroke(
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QCanvasPainter *painter,
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const QVector<QPointF> &points,
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const QColor &color,
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float width) {
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if (points.isEmpty())
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return;
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painter->setStrokeStyle(color);
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painter->setFillStyle(color);
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painter->setLineWidth(width);
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painter->setLineCap(QCanvasPainter::LineCap::Round);
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painter->setLineJoin(QCanvasPainter::LineJoin::Round);
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if (points.size() == 1) {
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painter->beginPath();
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painter->circle(points.front(), width * 0.5f);
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painter->fill();
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return;
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}
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painter->beginPath();
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painter->moveTo(points[0]);
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for (int i = 1; i < points.size() - 1; ++i) {
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QPointF mid = (points[i] + points [i + 1]) / 2;
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painter->quadraticCurveTo(points[i], mid);
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}
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painter->lineTo(points.last());
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painter->stroke();
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}
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static void drawDot(
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QCanvasPainter *painter,
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const QPointF &point,
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const QColor &color,
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float width)
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{
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painter->setFillStyle(color);
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painter->beginPath();
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painter->circle(point, width * 0.5f);
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painter->fill();
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}
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void StrokeCanvasRenderer::synchronizeData(QCanvasPainterItem *item) {
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auto *canvas = static_cast<StrokeCanvasItem *>(item);
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m_penColor = canvas->m_penColor;
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m_penWidth = canvas->m_penWidth;
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m_strokes = canvas->m_strokes;
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m_currentStroke = canvas->m_currentStroke;
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m_hoverVisible = canvas->m_hoverVisible;
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m_hoverPoint = canvas->m_hoverPoint;
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}
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void StrokeCanvasRenderer::paint(QCanvasPainter *painter) {
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painter->clearRect(0, 0, width(), height());
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for (const auto &stroke : m_strokes)
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drawStroke(painter, stroke.points, stroke.color, stroke.width);
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drawStroke(
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painter,
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m_currentStroke.points,
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m_currentStroke.color,
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m_currentStroke.width
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);
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if (m_hoverVisible) {
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drawDot(
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painter,
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m_hoverPoint,
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m_penColor,
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m_penWidth
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);
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}
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}
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};
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