85 lines
1.6 KiB
C++
85 lines
1.6 KiB
C++
#include "strokecanvasitem.hpp"
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#include "strokecanvasrenderer.hpp"
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#include <qnamespace.h>
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namespace ZShell::internal {
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StrokeCanvasItem::StrokeCanvasItem(QQuickItem *parent) : QCanvasPainterItem(parent) {
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setFillColor(Qt::transparent);
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setAlphaBlending(true);
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}
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QCanvasPainterItemRenderer *StrokeCanvasItem::createItemRenderer() const {
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return new StrokeCanvasRenderer;
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}
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static bool shouldAddPoint(
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const QVector<QPointF> &points,
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const QPointF &p,
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qreal minDistance)
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{
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if (points.isEmpty())
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return true;
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const QPointF delta = p - points.last();
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return QPointF::dotProduct(delta, delta)
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>= minDistance * minDistance;
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}
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void StrokeCanvasItem::setPenColor(const QColor &color) {
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if (m_penColor == color)
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return;
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m_penColor = color;
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update();
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emit penColorChanged();
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}
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void StrokeCanvasItem::setPenWidth(float width) {
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if (qFuzzyCompare(m_penWidth, width))
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return;
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m_penWidth = width;
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update();
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emit penWidthChanged();
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}
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void StrokeCanvasItem::beginStroke(qreal x, qreal y) {
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m_currentStroke.points.clear();
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m_currentStroke.points.append({x, y});
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m_currentStroke.color = m_penColor;
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m_currentStroke.width = m_penWidth;
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update();
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}
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void StrokeCanvasItem::appendPoint(qreal x, qreal y) {
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if (shouldAddPoint(m_currentStroke.points, {x, y}, 2.0))
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m_currentStroke.points.append({x, y});
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update();
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}
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void StrokeCanvasItem::endStroke() {
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if (m_currentStroke.points.isEmpty())
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return;
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m_strokes.append(m_currentStroke);
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m_currentStroke.points.clear();
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update();
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}
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void StrokeCanvasItem::clear() {
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m_strokes.clear();
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m_currentStroke.points.clear();
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update();
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}
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};
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