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Telegram/lib_ui/ui/paint/blob.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+class Painter;
+
+namespace Ui::Paint {
+
+class Blob {
+public:
+	struct Radiuses {
+		float min = 0.;
+		float max = 0.;
+	};
+
+	Blob(int n, float minSpeed = 0, float maxSpeed = 0);
+	virtual ~Blob() = default;
+
+	void update(float level, float speedScale, float64 rate);
+	void generateBlob();
+
+	void setRadiuses(Radiuses values);
+	[[nodiscard]] Radiuses radiuses() const;
+
+protected:
+	struct TwoValues {
+		float current = 0.;
+		float next = 0.;
+		void setNext(float v) {
+			current = next;
+			next = v;
+		}
+	};
+
+	struct Segment {
+		float progress = 0.;
+		float speed = 0.;
+	};
+
+	void generateSingleValues(int i);
+	virtual void generateTwoValues(int i) = 0;
+	virtual Segment &segmentAt(int i) = 0;
+
+	const int _segmentsCount;
+	const float _minSpeed;
+	const float _maxSpeed;
+	const QPen _pen;
+
+	Radiuses _radiuses;
+
+};
+
+class RadialBlob final : public Blob {
+public:
+	RadialBlob(int n, float minScale, float minSpeed = 0, float maxSpeed = 0);
+
+	void paint(QPainter &p, const QBrush &brush, float outerScale = 1.);
+	void update(float level, float speedScale, float64 rate);
+
+private:
+	struct Segment : Blob::Segment {
+		Blob::TwoValues radius;
+		Blob::TwoValues angle;
+	};
+
+	void generateTwoValues(int i) override;
+	Blob::Segment &segmentAt(int i) override;
+
+	const float64 _segmentLength;
+	const float _minScale;
+	const float _segmentAngle;
+	const float _angleDiff;
+
+	std::vector<Segment> _segments;
+
+	float64 _scale = 0;
+
+};
+
+class LinearBlob final : public Blob {
+public:
+	enum class Direction {
+		TopDown,
+		BottomUp,
+	};
+
+	LinearBlob(
+		int n,
+		Direction direction = Direction::TopDown,
+		float minSpeed = 0,
+		float maxSpeed = 0);
+
+	void paint(QPainter &p, const QBrush &brush, int width);
+
+private:
+	struct Segment : Blob::Segment {
+		Blob::TwoValues radius;
+	};
+
+	void generateTwoValues(int i) override;
+	Blob::Segment &segmentAt(int i) override;
+
+	const int _topDown;
+
+	std::vector<Segment> _segments;
+
+};
+
+} // namespace Ui::Paint