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line_chart.coffee
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line_chart.coffee
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# Copyright 2012 Joshua Carver
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# @import point.coffee
# @import bezier.coffee
# @import scaling.coffee
# @import tooltip.coffee
# @import dot.coffee
# @import line_chart_options.coffee
# @import line.coffee
# @import line_bar.coffee
# @import grid.coffee
# @import base_chart.coffee
class LineChart extends BaseChart
constructor: (dom_id, options = {}) ->
super dom_id, new LineChartOptions(options)
@padding = 26
@all_points = []
@line_indices = []
@line_options = []
add_line: (args) ->
data = args.data
return if data.length < 1
points = []
for item in data
if item.length == 3 # has options
points.push new Point(item[0], item[1], item[2])
else
points.push new Point(item[0], item[1])
points_count = @all_points.length
@line_indices.push [points_count, points_count + points.length-1]
@all_points.push.apply(@all_points, points)
@line_options.push LineChartOptions.merge(@options, args.options)
return
draw_grid: (x_coordinates = [], y_coordinates = []) ->
stroke = (path, color, width) ->
path.attr({
stroke: color
"stroke-width" : width
})
x_offset = if @options.multi_axis then @options.x_padding * 2 else @options.x_padding
height = @height - @options.y_padding
width = @width - x_offset
paths = @r.set()
for val in x_coordinates
paths.push @r.path("M #{val}, #{@options.y_padding} L #{val}, #{height} Z")
for val in y_coordinates
paths.push @r.path("M #{@options.x_padding}, #{val} L #{width}, #{val} Z")
# color the axis for easier reading
if @options.multi_axis == true && @line_options.length == 2
left_side = @options.x_padding
left_stroke = @r.path("M #{left_side}, #{@options.y_padding} L #{left_side}, #{height} Z")
right_side = @width - @options.x_padding * 2
right_stroke = @r.path("M #{right_side}, #{@options.y_padding} L #{right_side}, #{height} Z")
stroke(left_stroke, @line_options[0].line_color, 2).toBack()
stroke(right_stroke, @line_options[1].line_color, 2).toBack()
# do this last to avoid overwriting the multi axis colors
stroke(paths, "#ddd", 1).toBack()
create_scalers: (points) ->
y = undefined
max_x = undefined
min_x = undefined
max_y = undefined
min_y = undefined
if @options.scale == 'log'
log = new LogScaler()
log_points = (new Point(p.x, log(p.y)) for p in points)
[max_x, min_x, max_y, min_y] = Scaling.get_ranges_for_points(log_points)
else
[max_x, min_x, max_y, min_y] = Scaling.get_ranges_for_points(points)
if @options.y_axis_scale.length == 2
[min_y, max_y] = @options.y_axis_scale
x_offset = if @options.multi_axis then @options.x_padding * 2 else @options.x_padding
x = new Scaler()
.domain([min_x, max_x])
.range([@options.x_padding, @width - x_offset])
y_scaler = new Scaler()
.domain([min_y, max_y])
.range([@options.y_padding, @height - @options.y_padding])
# top of chart is 0,0 so need to reflect y axis
linear = (i) => @height - y_scaler(i)
if @options.scale == 'log'
y = (i) -> linear(log(i))
else
y = linear
[x, y]
create_scalers_for_single_point: () ->
y = (i) => 0.5 * (@height - @options.y_padding)
x = (i) => 0.5 * (@width - @options.x_padding)
[x, y]
_draw_y_labels: (labels, x_offset = 0) ->
fmt = @options.label_format
size = @options.y_label_size
font_family = @options.font_family
color = @options.label_color || '#333'
padding = size + 5
# How far from the left are the labels going to be?
offset = if @options.multi_axis && x_offset > 0 then x_offset else x_offset + padding
# If there's a label for this axis then they need to be a little more to the
# right to make space for the label.
if @options.y_axis_name
offset += (size * 1.75)
# Create the label
label_color = @options.axis_name_color || '#333'
label_size = @options.axis_name_size || size
label = new Label(
@r,
5,
@height / 2,
@options.y_axis_name,
fmt,
label_size,
font_family,
label_color
).draw()
# Rotate the label so you read it upwards - this will knock out the
# X position
label.transform("T0,0R270S1")
# Fix the X position by taking the bounding box's X position and
# translating to 0
label.transform("...t0," + (label.getBBox()['x'] * -1))
if labels.length == 1
[x,y] = @create_scalers_for_single_point()
else
[x, y] = @create_scalers(labels)
label_coordinates = []
axis = new LabelSet(@r, fmt)
.x((i) -> offset)
.y((i) -> y(labels[i].y))
.size(size)
.color(color)
for label in labels
axis.draw(label.y)
label_coordinates.push y(label.y)
label_coordinates
calc_y_label_step_size: (min_y, max_y, max_labels = @options.max_y_labels) ->
step_size = (max_y - min_y)/(max_labels-1)
# round to nearest int
if max_y > 1
step_size = Math.round(step_size)
step_size = 1 if step_size == 0
step_size
draw_y_labels: (points, x_offset = 0) ->
[max_x, min_x, max_y, min_y] = Scaling.get_ranges_for_points(points)
if @options.y_axis_scale.length == 2
[min_y, max_y] = @options.y_axis_scale
# draw 1 label if all values are the same
return @_draw_y_labels([new Point(0, max_y)], x_offset) if max_y == min_y
labels = []
if @options.scale == 'log'
log = new LogScaler()
start = log(min_y)
end = log(max_y)
step_size = (end - start)/(@options.max_y_labels-1)
label = min_y
n = 0
while label <= max_y && n < @options.max_y_labels
label = Math.pow(10, start + step_size * n)
labels.push new Point(0, label)
n += 1
else
y = min_y
step_size = @calc_y_label_step_size(min_y, max_y)
while y <= max_y
labels.push new Point(0, y)
y += step_size
labels[labels.length-1].y = Math.round(max_y) if max_y > 1
return @_draw_y_labels(labels, x_offset)
draw_x_label: (raw_point, point) ->
fmt = @options.label_format
size = @options.x_label_size
font_family = @options.font_family
color = @options.label_color || '#333'
# If the x label is named make room for it by nudging the labels a little
# higher towards the graph
if @options.x_axis_name
y = @height - (size * 2)
else
y = @height - size
label = if raw_point.is_date_type == true then new Date(raw_point.x) else Math.round(raw_point.x)
new Label(
@r,
point.x,
y,
label,
fmt,
size,
font_family,
color
).draw()
draw_x_labels: (raw_points, points) ->
label_coordinates = []
max_labels = @options.max_x_labels
# Is this axis named? If so, add the label name to the axis
if @options.x_axis_name
color = @options.axis_name_color || '#333'
label_size = @options.axis_name_size || @options.x_label_size
label = new Label(
@r,
(@width / 2),
@height - (@options.x_label_size / 2),
@options.x_axis_name,
@options.label_format,
label_size,
@options.font_family,
color
).draw()
# draw first
@draw_x_label(raw_points[0], points[0])
label_coordinates.push points[0].x
return if max_labels < 2
# draw last
last = points.length-1
@draw_x_label(raw_points[last], points[last])
label_coordinates.push points[last].x
return if max_labels < 3
len = points.length-1
step_size = len / (max_labels-1)
# when irrational
rounded_step_size = Math.round(step_size)
step_size = rounded_step_size+1 if step_size != rounded_step_size
# draw labels in between first and last
i = step_size
while i < len
raw_point = raw_points[i]
point = points[i]
@draw_x_label(raw_point, point)
label_coordinates.push point.x
i += step_size
label_coordinates
draw_line: (raw_points, points, options) ->
if @options.render == "bar"
new LineBar(
@r,
raw_points,
points,
@height,
@width,
options
).draw()
else
new Line(
@r,
raw_points,
points,
@height,
@width,
options
).draw()
clear: () ->
super()
@all_points = []
@line_indices = []
@line_options = []
draw: () ->
return if @all_points.length < 1
@r.clear()
[x, y] = if @all_points.length > 1 then @create_scalers(@all_points) else @create_scalers_for_single_point()
for line_indices, i in @line_indices
[begin, end] = line_indices
raw_points = @all_points[begin..end]
# scale points on their own axis if multi axis is set
if @options.multi_axis
[line_x, line_y] = if @all_points.length > 2 then @create_scalers(raw_points) else @create_scalers_for_single_point()
else
line_x = x
line_y = y
points = (new Point(line_x(point.x), line_y(point.y)) for point in raw_points)
options = @line_options[i]
@draw_line(raw_points, points, options)
if i == 0
@x_label_coordinates = @draw_x_labels(raw_points, points) if @options.show_x_labels == true
if @options.multi_axis && @options.show_y_labels == true
@y_label_coordinates = @draw_y_labels(raw_points)
else if @options.show_y_labels == true
@y_label_coordinates = @draw_y_labels(@all_points)
@draw_grid(@x_label_coordinates, @y_label_coordinates) if @options.show_grid == true
else if i == 1 && @options.multi_axis
@draw_y_labels(raw_points, @width - @options.x_padding) if @options.show_y_labels == true
return
exports.LineChart = LineChart