/* $Id: axis.pl,v 1.2 2002/02/01 15:04:53 jan Exp $ Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (C): 1985-2002, University of Amsterdam This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA As a special exception, if you link this library with other files, compiled with a Free Software compiler, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ :- module(plot_axis, []). :- use_module(library(pce)). :- require([ ceiling/2 , forall/2 , round/2 ]). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This library defines class plot_axis, an axis used for plotting graphs or barcharts. Normally this library is used in combination with the library('plot/plotter'), but it can also be used stand-alone. For example: ?- send(new(P, picture), open), send(P, display, plot_axis(x, 0, 100, @default, 400, point(40, 320))), send(P, display, plot_axis(y, 0, 500, @default, 300, point(40, 320))). - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ :- pce_begin_class(plot_axis(type, low, high), line, "Coordinate system axis"). class_variable(tag_font, font, normal, "Font for values"). :- pce_group(attributes). variable(origin, point, get, "Location of the origin"). variable(low, 'int|real', get, "Low end of the range"). variable(high, 'int|real', get, "High end of the range"). variable(step, 'int|real', get, "Indication steps"). variable(small_step, 'int|real*', get, "Unnumbered indication steps"). variable(length, int, get, "Total length"). variable(type, {x,y}, get, "Horizontal/vertical"). variable(value_format, [name], get, "Value format specification"). variable(label, graphical*, get, "Label along the axis"). :- pce_group(internal). variable(support, chain, none, "Supporting graphicals"). :- pce_group(@default). initialise(A, Type:'type={x,y}', Low:'low=int|real', High:'high=int|real', Step:step=[int|real], Lenght:length=[int], O:'origin=[point]') :-> "Create from low, high, step, length and type":: default(Lenght, 200, Len), ( Step == @default -> determine_steps(Low, High, Lenght, Type, TheStep, SmallStep) ; TheStep = Step, SmallStep = @nil ), send_super(A, initialise), send(A, slot, origin, new(P, point)), ( O \== @default -> send(P, copy, O) ; true ), send(A, slot, low, Low), send(A, slot, high, High), send(A, slot, length, Len), send(A, slot, small_step, SmallStep), send(A, slot, step, TheStep), send(A, slot, type, Type), send(A, slot, support, new(chain)), send(A, slot, value_format, @default), send(A, request_compute). determine_steps(Low, High, Len, XY, Step, SmallStep) :- Step0 is 10**round(log10(High-Low)-1), Dist is Len/((High-Low)/Step0), ( okdist(XY, Dist) -> Step = Step0, SmallStep = @nil ; Step is Step0*5, SmallStep = Step0 ). okdist(x, Dist) :- Dist > 60. okdist(y, Dist) :- Dist > 25. unlink(A) :-> "Delete all <-support objects":: get(A, slot, support, Support), send(Support, for_all, message(@arg1, free)), send_super(A, unlink). device(A, Dev:device*) :-> "Trap device changes":: get(A, slot, support, Support), send(Support, for_all, message(@arg1, device, Dev)), ( get(A, label, Label), Label \== @nil -> send(Label, device, Dev) ; true ), send_super(A, device, Dev). /******************************* * USER COMPUTATION * *******************************/ :- pce_group(compute). location(A, Val:'int|real', Loc:int) :<- "Location for value":: loc(A, Val, Loc). value_from_coordinate(A, Loc:int, Val:'int|real') :<- "Translate location into value":: loc(A, Val, Loc). /******************************* * SLOT CHANGES * *******************************/ :- pce_group(update). changed(A) :-> "A has changed: force update":: send(A, request_compute). :- pce_group(@default). origin(A, P:point) :-> send(A?origin, copy, P), send(A, changed). label(A, L:graphical*) :-> send(A, slot, label, L), send(A, changed). low(A, L:'int|real') :-> send(A, slot, low, L), send(A, changed). high(A, L:'int|real') :-> send(A, slot, high, L), send(A, changed). step(A, L:'int|real') :-> send(A, slot, step, L), send(A, changed). small_step(A, L:'int|real') :-> send(A, slot, small_step, L), send(A, changed). length(A, Length:int) :-> send(A, slot, length, Length), send(A, changed). type(A, T:{x,y}) :-> send(A, slot, type, T), send(A, changed). format(A, Fmt:[name]) :-> send(A, slot, value_format, Fmt), send(A, changed). geometry(A, X:[int], Y:[int], W:[int], H:[int]) :-> "Trap geometry changes":: ( get(A, request_compute, computing) -> send_super(A, geometry, X, Y, W, H) ; ( get(A, type, x) -> send_super(A, geometry, X, Y, W, @default), send(A, length, A?width) ; send_super(A, geometry, X, Y, @default, H), send(A, length, -A?height) ) ). /******************************* * COMPUTING * *******************************/ loc(A, V, X) :- get(A, origin, O), get(A, type, T), get(O, T, Origin), get(A, low, Low), get(A, high, High), get(A, length, Length), ( T == x -> ( nonvar(V) -> X is round(Origin + ((V-Low) * Length) / (High - Low)) ; V is Low + (X-Origin) * (High-Low)/Length ) ; ( nonvar(V) -> X is round(Origin - ((V-Low) * Length) / (High - Low)) ; V is Low + (Origin-X) * (High-Low)/Length % not tested ) ). tick(Low, High, Step, Tick) :- TheLow is Low - Step / 10000, TheHigh is High + Step / 10000, % avoid floating point rounding L0 is ceil(TheLow/Step) * Step, tick_(L0, TheHigh, Step, Tick). tick_(L, _, _, L). tick_(L, H, S, V) :- L1 is L + S, L1 =< H, tick_(L1, H, S, V). format(A, Fmt:[char_array]) :<- "Compute format to use":: ( get(A, slot, value_format, SlotValue), SlotValue \== @default -> Fmt = SlotValue ; get(A, step, Step), integer(Step), !, Fmt = '%d' ; get(A, step, Step), new(S, string('%f', Step)), new(Re, regex('\\..*[^0]')), send(Re, search, S), get(Re, register_end, End), get(Re, register_start, Start), send(Re, done), AfterDot is End - Start - 1, % 1 for the dot new(Fmt, string('%%.%df', AfterDot)) ). compute_small_steps(A) :-> get(A, small_step, SmallStep), ( SmallStep \== @nil -> get(A, low, Low), get(A, high, High), get(A, step, Step), get(A, device, Dev), get(A, origin, point(OX, OY)), get(A, slot, support, Support), ( get(A, type, x) -> forall(tick(Low, High, SmallStep, TV), ( A is TV / Step, integer(A) -> true ; loc(A, TV, TX), send(Dev, display, new(L, line(TX, OY, TX, OY+3))), send(Support, append, L) )) ; forall(tick(Low, High, SmallStep, TV), ( A is TV / Step, integer(A) -> true ; loc(A, TV, TY), send(Dev, display, new(L, line(OX-3, TY, OX, TY))), send(Support, append, L) )) ) ; true ). place_label(_, @nil, _, _, _) :- !. place_label(Dev, Label, Dir, X, Y) :- get(Label, size, size(W, H)), ( Dir == x -> send(Label, do_set, X-W, Y-H-3) ; send(Label, do_set, X+3, Y) ), send(Dev, display, Label). compute(A) :-> send(A, slot, request_compute, computing), get(A, low, Low), get(A, high, High), get(A, step, Step), get(A, format, Fmt), get(A, origin, point(OX, OY)), get(A, slot, support, Support), get(A, tag_font, Font), get(A, label, Label), send(Support, for_all, message(@arg1, free)), send(Support, clear), loc(A, Low, Start), loc(A, High, End), get(A, device, Dev), ( get(A, type, x) -> send(A, points, Start, OY, End, OY), place_label(Dev, Label, x, End, OY), forall(tick(Low, High, Step, TV), ( loc(A, TV, TX), send(Dev, display, new(L, line(TX, OY, TX, OY+5))), send(Dev, display, new(T, text(string(Fmt, TV), font := Font)), point(TX-3, OY+5)), send(Support, append, L), send(Support, append, T) )) ; send(A, points, OX, Start, OX, End), place_label(Dev, Label, y, OX, End), forall(tick(Low, High, Step, TV), ( loc(A, TV, TY), send(Dev, display, new(L, line(OX-5, TY, OX, TY))), new(T, text(string(Fmt, TV), font := Font)), get(T, width, TW), get(T, height, TH), send(T, set, OX-5-TW, TY-TH+3), send(Dev, display, T), send(Support, append, L), send(Support, append, T) )) ), send(A, compute_small_steps), ( send(Dev, has_send_method, modified_plot_axis) -> send(Dev, modified_plot_axis, A) ; true ), send_super(A, compute). :- pce_end_class. /******************************* * RULER * *******************************/ :- pce_begin_class(plot_ruler, device, "Show X/Y value of point"). variable(value, real, get, "Displayed value"). variable(value_format, name := '%g', both, "Format used for values"). initialise(R) :-> send_super(R, initialise), send(R, display, new(L, line)), send(L, texture, dotted), send(R, display, new(T, text(0))), send(T, border, 3), send(T, background, navajo_white), send(R, slot, value, 0). attach(R, Axis:axis=plot_axis, Value:real, Length:length=[int]) :-> send(R, detach), get(R, member, line, Line), get(R, member, text, Text), get(Axis, device, Plotter), get(Axis, format, Format), send(R, slot, value_format, Format), ( get(Axis, type, x) % X-axis -> send(Text, format, center), send(Text, center_x, 0), get(Axis, y, Bottom), send(R, y, Bottom), ( Length == @default -> get(Plotter, y_axis, YAxis), get(YAxis, length, Len) ; Len = Length ), send(Line, points, 0, 5, 0, -Len), send(Text, y, 5) ; send(Text, format, right), % Y-axis send(Text, center_y, 0), get(Axis, x, Left), send(R, x, Left), ( Length == @default -> get(Plotter, x_axis, XAxis), get(XAxis, length, Right) ; Right = Length ), send(Line, points, -5, 0, Right, 0), send(Text, x, -5-Text?width) ), send(Plotter, display, R), new(_, hyper(Axis, R, rules, axis)), send(R, value, Value). detach(R) :-> send(R, delete_hypers, axis), send(R, device, @nil). value(R, Val:real) :-> send(R, slot, value, Val), send(R, request_compute, value). compute(R) :-> ( get(R, request_compute, value), send(R, slot, request_compute, @default), get(R, hypered, axis, Axis), get(R, device, Plotter), Plotter \== @nil -> get(R, value, Value), ( get(Axis, type, x) -> get(Plotter, translate_x, Value, X), send(R, x, X) ; get(Plotter, translate_y, Value, Y), send(R, y, Y) ), get(R, member, text, Text), get(R, value_format, Format), send(Text, string, string(Format, Value)) ; true ), send_super(R, compute). :- pce_end_class.