Method drawMeasure

examples/scenes/src/PathsScene.java:391–415

(Canvas canvas)

    }

    private void drawMeasure(Canvas canvas) {
        canvas.save();

        try (var path = new Path().addCircle(20, 20, 20, PathDirection.COUNTER_CLOCKWISE);
             var measure = new PathMeasure(path, false);
             var segment = new Path();
             var arcStroke = new Paint().setColor(0xFF437AA0).setMode(PaintMode.STROKE).setStrokeWidth(1);
             var tangentStroke = new Paint().setColor(0xFFFAA6B2).setMode(PaintMode.STROKE).setStrokeWidth(1);)
        {
            canvas.drawPath(path, arcStroke);
            canvas.translate(50, 0);

            measure.getSegment(50, 100, segment, true);
            canvas.drawPath(segment, arcStroke);

            for (float d = 50; d < 100; d += 10) {
                Point position = measure.getPosition(d);
                Point tangent = measure.getTangent(d);
                canvas.drawLine(position.getX(), position.getY(), position.getX() + tangent.getX() * 15f, position.getY() + tangent.getY() * 15f, tangentStroke);
            }
        }

        canvas.restore();
        canvas.translate(0, 50);
    }
}