# Copyright (c) 2008, Humanized, Inc.
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# ----------------------------------------------------------------------------
#
#   enso.graphics.rounded_rect
#
# ----------------------------------------------------------------------------

"""
    Functions and constants for drawing rounded rectangles.
"""

# ----------------------------------------------------------------------------
# Constants
# ----------------------------------------------------------------------------

LOWER_RIGHT = 0
UPPER_RIGHT = 1
LOWER_LEFT = 2
UPPER_LEFT = 3
ALL_CORNERS = [ LOWER_RIGHT, UPPER_RIGHT, LOWER_LEFT, UPPER_LEFT ]

# The radius of a corner of a rounded rectangle, in points.
CORNER_RADIUS = 5


# ----------------------------------------------------------------------------
# Public Functions
# ----------------------------------------------------------------------------

def drawRoundedRect( context, rect, softenedCorners ):
    """
    Draws a rectangle where each corner in softenedCorners has a
    CORNER_RADIUS-unit radius arc instead of a corner.
    """
    
    PI = 3.1415926535
    context.new_path()

    xPos,yPos,width,height = rect

    if LOWER_RIGHT in softenedCorners:
        context.arc( xPos+width-CORNER_RADIUS,
                     yPos+height-CORNER_RADIUS,
                     CORNER_RADIUS,
                     0,
                     .5*PI )
    else:
        context.move_to( xPos+width, yPos+height-CORNER_RADIUS )
        context.line_to( xPos+width, yPos+height )
    context.line_to( xPos+CORNER_RADIUS, yPos+height )

    if LOWER_LEFT in softenedCorners:
        context.arc( xPos+CORNER_RADIUS,
                     yPos+height-CORNER_RADIUS,
                     CORNER_RADIUS,
                     .5*PI,
                     PI )
    else:
        context.line_to( xPos, yPos+height )
    context.line_to( xPos, yPos+CORNER_RADIUS )

    if UPPER_LEFT in softenedCorners:
        context.arc( xPos+CORNER_RADIUS,
                     yPos+CORNER_RADIUS,
                     CORNER_RADIUS,
                     PI,
                     1.5*PI )
    else:
        context.line_to( xPos, yPos )
    context.line_to( xPos+width-CORNER_RADIUS, yPos )

    if UPPER_RIGHT in softenedCorners:
        context.arc( xPos+width-CORNER_RADIUS,
                     yPos+CORNER_RADIUS,
                     CORNER_RADIUS,
                     1.5*PI,
                     2*PI )
    else:
        context.line_to( xPos+width, yPos )
    context.line_to( xPos+width, yPos+height-CORNER_RADIUS )