bigbluebutton-Github/labs/bbb-html5-client/public/js/models/whiteboard_triangle.coffee
2013-04-28 13:21:08 -04:00

104 lines
4.1 KiB
CoffeeScript

define [
'jquery',
'underscore',
'backbone',
'raphael',
'globals',
'cs!utils',
'cs!models/whiteboard_tool'
], ($, _, Backbone, Raphael, globals, Utils, WhiteboardToolModel) ->
# A triangle in the whiteboard
class WhiteboardTriangleModel extends WhiteboardToolModel
initialize: (@paper) ->
super @paper
# the defintion of this shape, kept so we can redraw the shape whenever needed
# format: x1, y1, x2, y2, stroke color, thickness
@definition = [0, 0, 0, 0, "#000", "0px"]
# Make a triangle on the whiteboard
# @param {[type]} x the x value of the top left corner
# @param {[type]} y the y value of the top left corner
# @param {string} colour the colour of the object
# @param {number} thickness the thickness of the object's line(s)
make: (x, y, colour, thickness) ->
path = @_buildPath(x, y, x, y, x, y)
@obj = @paper.path(path)
@obj.attr Utils.strokeAndThickness(colour, thickness)
@obj.attr({"stroke-linejoin": "round"})
@definition =
shape: "triangle"
data: [x, y, x, y, @obj.attrs["stroke"], @obj.attrs["stroke-width"]]
@obj
# Update triangle drawn
# @param {number} x1 the x value of the top left corner
# @param {number} y1 the y value of the top left corner
# @param {number} x2 the x value of the bottom right corner
# @param {number} y2 the y value of the bottom right corner
update: (x1, y1, x2, y2) ->
if @obj?
[xTop, yTop, xBottomLeft, yBottomLeft, xBottomRight, yBottomRight] = @_getCornersFromPoints(x1, y1, x2, y2)
path = @_buildPath(xTop * @gw + @xOffset, yTop * @gh + @yOffset,
xBottomLeft * @gw + @xOffset, yBottomLeft * @gh + @yOffset,
xBottomRight * @gw + @xOffset, yBottomRight * @gh + @yOffset)
@obj.attr path: path
@definition.data[0] = x1
@definition.data[1] = y1
@definition.data[2] = x2
@definition.data[3] = y2
# Draw a triangle on the whiteboard
# @param {number} x1 the x value of the top left corner
# @param {number} y1 the y value of the top left corner
# @param {number} x2 the x value of the bottom right corner
# @param {number} y2 the y value of the bottom right corner
# @param {string} colour the colour of the object
# @param {number} thickness the thickness of the object's line(s)
draw: (x1, y1, x2, y2, colour, thickness) ->
[xTop, yTop, xBottomLeft, yBottomLeft, xBottomRight, yBottomRight] = @_getCornersFromPoints(x1, y1, x2, y2)
path = @_buildPath(xTop, yTop, xBottomLeft, yBottomLeft, xBottomRight, yBottomRight)
path = @_scaleTrianglePath(path, @gw, @gh, @xOffset, @yOffset)
triangle = @paper.path(path)
triangle.attr Utils.strokeAndThickness(colour, thickness)
triangle.attr({"stroke-linejoin": "round"})
triangle
_getCornersFromPoints: (x1, y1, x2, y2) ->
xTop = (((x2 - x1) / 2) + x1)
yTop = y1
xBottomLeft = x1
yBottomLeft = y2
xBottomRight = x2
yBottomRight = y2
[xTop, yTop, xBottomLeft, yBottomLeft, xBottomRight, yBottomRight]
_buildPath: (xTop, yTop, xBottomLeft, yBottomLeft, xBottomRight, yBottomRight) ->
"M#{xTop},#{yTop},#{xBottomLeft},#{yBottomLeft},#{xBottomRight},#{yBottomRight}z"
# Scales a triangle path string to fit within a width and height of the new paper size
# @param {number} w width of the shape as a percentage of the original width
# @param {number} h height of the shape as a percentage of the original height
# @return {string} the path string after being manipulated to new paper size
_scaleTrianglePath: (string, w, h, xOffset=0, yOffset=0) ->
path = null
points = string.match(/(\d+[.]?\d*)/g)
len = points.length
j = 0
# go through each point and multiply it by the new height and width
path = "M"
while j < len
path += "," unless j is 0
path += "" + (points[j] * w + xOffset) + "," + (points[j + 1] * h + yOffset)
j += 2
path + "z"
WhiteboardTriangleModel