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(in-package :graph)
;;; GRAPH-DATA-LEGEND-MIXIN PROTOCOL:
;;;
;;; Allows a dataset to provide a legend item for graphs. [Legends can grow quite
;;; large when many datasets are involved, so a major goal is keeping them
;;; individually small.]
;;;
;;; DISPLAY-LEGEND-DATASET
;;; Display a legend item for this dataset. This has 2 parts: legend data and a
;;; legend-string.
;;; DISPLAY-LEGEND-STRING
;;; Displays the string part of the legend
;;; DISPLAY-LEGEND-DATUMS
;;; Displays the data part of the legend. To display legend datums, there is a
;;; subprotocol. A second dataset (called the legend dataset) is used to provide
;;; some data points (3) for display. If the data structure of the points in the
;;; legend dataset does not match the data structure of the "real" dataset,
;;; applications may need to specialize one of the following methods.
;;; LEGEND-DATASET
;;; Returns a (small) dataset containing the actual points to display. By
;;; default, a single dataset is instantiated, cached, and reused for every
;;; legend. The datums are lists of the form (X Y).
;;; LEGEND-DATUM-DISPLAYER
;;; Returns a function (like DATUM-DISPLAYER) that takes arguments X Y and
;;; DATUM and draws the datum in the proper symbologies.
(defclass SHOW-LEGEND-MIXIN ()
((show-legend :initform t :initarg :show-legend :accessor show-legend)) ; Show the legend?
(:documentation "Provide a flag to show legend."))
(defmethod show-legend ((any t)) nil)
;;; KRA 27APR93: I removed this because it requires datasets to know what graph
;;; they are being drawn on, which seems unfair. Also, the hidden-dataset check
;;; is make explicitly in (method display (legend-annotation t))
#+OLD
(defmethod show-legend :around ((dataset basic-graph-data))
(and (call-next-method)
(not (member dataset (hidden-datasets (graph dataset))))))
;;; needs some sort of symbology to work.
(defclass GRAPH-DATA-LEGEND-MIXIN (basic-graph-datum-symbology-mixin
show-legend-mixin)
()
(:documentation
"Allows a dataset to provide a legend item for graphs."))
(defmethod legend-string ((self graph-data-legend-mixin))
(let ((name (name self)))
(if name (string name)))) ; You may want to override this.
(defvar *legend-symbology-width* 40 "Width of legend symbology, in pixels.")
(defvar *legend-gap* 10 "Gap between legend symbology and string, in pixels.")
(defvar *legend-style* '(:fix :roman :very-small)) ; the smallest clim font.
(defmethod legend-size ((self graph-data-legend-mixin) stream
&optional (style (parse-text-style *legend-style*)))
"WIDTH and HEIGHT in pixels of area needed to display legend."
(let ((legend (legend-string self)))
(if legend
(multiple-value-bind (width height)
(string-size stream style "~A" legend)
(values (+ *legend-symbology-width* *legend-gap* width)
height))
(values 0 0))))
(defmethod make-legend-datum ((self graph-data-legend-mixin) x y &rest args)
`(,x ,y ,@args))
(let ((legend-dataset-cache nil))
(defmethod LEGEND-DATA ((self graph-data-legend-mixin))
"Return a dataset to use to draw the points in the legend."
(or legend-dataset-cache
(let* ((x .5)
(y .5)
(dataset (make-instance 'graph-data
:data
(list (make-legend-datum self (- x) y)
(make-legend-datum self 0 (- y))
(make-legend-datum self x y))
:bar-width x)))
(setq legend-dataset-cache dataset)
dataset))))
(defmethod legend-datum-displayer ((self graph-data-legend-mixin) graph)
"Returns a function of arguments STREAM U V and DATUM that get applied to data
from the legend dataset to display the data part of the legend."
(datum-displayer self graph))
(defmethod dont-record-output-history ((self graph-data-legend-mixin)) nil)
(defmethod legend-scale-limits ((self graph-data-legend-mixin) legend-data)
"A sort of poor man's auto scaling for legend data."
(let ((fudge .1))
(multiple-value-bind (left right bottom top)
(apply #'values (auto-scale-limits legend-data :both nil nil nil nil))
(values (- left fudge) (+ right fudge) (- bottom fudge) (+ top fudge)))))
(defmacro with-bar-width ((dataset width) &body body)
`(let ((.old-width. (bar-width ,dataset)))
(unwind-protect
(progn (setf (bar-width ,dataset) ,width) ,@body)
(setf (bar-width ,dataset) .old-width.))))
(defmethod display-legend-datums ((self graph-data-legend-mixin) STREAM
graph left bottom width height)
"Display some points in the legend area to show the current symbology settings."
(let ((legend-data (legend-data self)))
;; The contract here is that the legend data knows about the data structure of
;; its datums, and the "real" data knows how to display them. This works OK as
;; long as the displayer doesn't assume too much about the datums coming from the
;; legend data.
(with-bar-width (self (bar-width legend-data))
(multiple-value-bind (xll xur yll yur) (legend-scale-limits self legend-data)
;; Warp the graph to think its edges are the edges of the legend.
(with-graph-coordinates (graph STREAM
left (+ left width) bottom (+ bottom height)
xll xur yll yur)
(with-clipping-to-graph (graph STREAM t)
(with-alu (stream (alu self))
;; SELF provides the displayer, but LEGEND-DATA provides the mapper.
(let ((displayer (legend-datum-displayer self graph)))
(map-data legend-data
#'(lambda (datum)
(declare (downward-function))
(multiple-value-bind (x y)
(datum-position legend-data datum)
(multiple-value-setq (x y) (xy-to-uv graph x y))
(multiple-value-setq (x y) (uv-to-screen stream x y))
(funcall displayer stream x y datum)))
(data legend-data))))))))))
(defmethod display-legend-string ((self graph-data-legend-mixin) STREAM graph u v)
"Display the string part of the legend."
(text graph STREAM u v (legend-string self)))
(defmethod display-legend-dataset ((self t) STREAM graph left bottom width height)
(declare (ignore stream graph left bottom width height))
;; Default is a noop, so that graphs can assume everybody handles this method.
nil)
(defmethod display-legend-dataset ((self graph-data-legend-mixin) STREAM
graph left bottom width height)
"Display legend data and string in given UV region of graph."
(declare (ignore width))
(when (show-legend self)
(display-legend-datums self STREAM graph
left bottom *legend-symbology-width* height)
(display-legend-string
self STREAM graph
(+ left *legend-symbology-width* *legend-gap*) bottom)))
;;; GRAPH LEGENDS
(defclass GRAPH-LEGEND-MIXIN (graph-datasets-mixin show-legend-mixin)
(;; Distance from bottom of graph (px)
(legend-offset :initform 0 :initarg :legend-offset :accessor legend-offset))
(:documentation "Provide graph with a Legend describing each dataset."))
(defmethod show-graph-legend ((any t)) nil)
(defmethod show-graph-legend ((self graph-legend-mixin))
(and (show-legend self) (some #'show-legend (datasets self))))
(defmethod legend-size ((self graph-legend-mixin) the-stream
&optional (style (parse-text-style *legend-style*)))
"Width and height of graph legend area."
(if (show-graph-legend self)
(let ((x 0)
(y 0))
(with-character-style (style the-stream) ; bind line height
(dolist (d (datasets self))
(when (show-legend d)
(multiple-value-bind (dx dy) ; assumes vertical orientation of legends
(legend-size d the-stream style)
(incf y dy)
(setf x (max x dx))))))
(values x y))
(values 0 0)))
(defmethod legend-compute-margins ((self graph-legend-mixin) STREAM left right bottom top)
;; Give the legend a chance to modify the margin area of the graph.
(setf (legend-offset self) bottom)
(multiple-value-bind (foo legh) (legend-size self stream)
(declare (ignore foo))
(values left right (+ legh bottom) top)))
(defmethod compute-margins :around ((self graph-legend-mixin) STREAM)
(multiple-value-bind (left right bottom top) (call-next-method)
(legend-compute-margins self stream left right bottom top)))
(defmethod display-labels :after ((self graph-legend-mixin) STREAM)
(when (show-graph-legend self) (display-legend self STREAM)))
(defmethod display-legend ((self graph-legend-mixin) STREAM)
"Display each legend dataset in the margin area."
(multiple-value-bind (px foo py bar) (uv-inside self)
(declare (ignore foo bar))
(setq py (- py (legend-offset self)))
(with-character-style ((parse-text-style *legend-style*) stream)
(let ((hidden (hidden-datasets self)))
(dolist (dataset (datasets self))
(or (member dataset hidden)
(multiple-value-bind (dx dy) (legend-size dataset stream)
(display-legend-dataset dataset STREAM self px py dx dy)
(setq py (- py dy)))))))))
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