Function Context.arc

If there is a current point, an initial line segment will be added to the path to connect the current point to the beginning of the arc. If this initial line is undesired, it can be avoided by calling newSubPath() before calling arc().

Angles are measured in radians. An angle of 0.0 is in the direction of the positive X axis (in user space). An angle of PI/2.0 radians (90 degrees) is in the direction of the positive Y axis (in user space). Angles increase in the direction from the positive X axis toward the positive Y axis. So with the default transformation matrix, angles increase in a clockwise direction.

(To convert from degrees to radians, use degrees * (PI / 180))

This function gives the arc in the direction of increasing angles; see arcNegative() to get the arc in the direction of decreasing angles.

The arc is circular in user space. To achieve an elliptical arc, you can scale the current transformation matrix by different amounts in the X and Y directions. For example, to draw an ellipse in the box given by x, y, width, height:

cr.save();
cr.translate(x + width / 2, y + height / 2);
cr.scale(width / 2, height / 2);
cr.arc(Point(0, 0), 1, 0, 2 * PI);
cr.restore();

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