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simpleplot.m
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simpleplot.m
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% SIMPLEPLOT(DATA [, IDXS [, COLORS [, KEYCB [, DISPLAYCB [, UD]]]]])
% Simple interactive plot.
%
% New "display list" calling convention
% -------------------------------------
% DATA: a cell of size N-by-3, with N >= 1 and rows like
% GL.<PRIMITIVE_TYPE>, vertex_coords, struct(...)
% Thus, each row contains arguments to glcall(glc.draw, ...).
% This form is detected by checking that DATA{1} is a uint32 scalar.
%
% IDXS becomes an optioal DISPLAYCB in this convention.
%
% Legacy "simple" calling convention
% ----------------------------------
% DATA: 3 x numverts or length-#datasets cell with 3-by-numverts_i arrays each
% IDXS: zero-based, 3 x numfaces, matrix of triangle indices. If IDXS(1) is
% negative, -IDXS is taken as a permutation on the dimensions of the data else.
function simpleplot(data, idxs, colors, keycb, displaycb, ud)
% 'simpleplot' can be run with both classdef-enabled M-implementations or those
% that don't have classdef.
% For classdef: 'simpl' is a cell array: {winid} -> GLCSimplePlotData handle
% For legacy: 'simpl' is a struct, making the plot a singleton
global GL glc
if (nargin < 1)
% IDXS is 3 x #tris
disp(['Usage: simpleplot(data [, idxs [, colors [, keycb]]]), ', ...
'data is DIM x N, where DIM is either 2 or 3'])
return
end
havelist = (iscell(data) && ~isempty(data) && ...
strcmp(class(data{1}), 'uint32') && numel(data{1})==1);
haveDisplayCb = ((~havelist && nargin >= 5) || (havelist && nargin >= 2));
data_dims_perm = [];
if (havelist)
% Display list trumps all.
assert(nargin <= 2, 'When passing "display list" DATA, must have 1 or 2 inargs')
if (haveDisplayCb)
displaycb = idxs;
end
else
if (nargin < 2)
idxs = zeros(3,0,'uint32');
else
if (~isempty(idxs))
if (idxs(1) < 0)
data_dims_perm = -idxs;
idxs = zeros(3,0,'uint32');
else
if (~strcmp(class(idxs), 'uint32') && ~strcmp(class(idxs), 'uint8'))
error('IDXS must have class uint32 or uint8')
end
if (size(idxs, 1)~=3)
error('IDXS must have 3 rows')
end
end
end
end
if (nargin < 3)
colors = zeros(3, 0);
else
if (~isempty(colors))
if (~strcmp(class(colors), 'double') && ~iscell(colors))
error('COLORS must have class double or be a cell')
end
% size check: left to glcall
end
end
if (nargin >= 4)
if (~isa(keycb, 'function_handle'))
error('KEYCB must be a function handle');
end
end
if (haveDisplayCb)
if (~isa(displaycb, 'function_handle'))
error('DISPLAYCB must be a function handle');
end
end
end
glc = glcall();
GL = glconstants();
if (simpl_have_classdef())
simpl = GLCSimplePlotData();
va = { simpl };
else
global simpl
simpl = struct();
va = {};
end
simpl.havelist = havelist;
if (~havelist)
%% Argument pre-processing (convenience calling conventions)
if (iscell(data))
assert(isvector(data), 'Cell DATA must be a vector');
if (iscell(colors))
assert(isvector(colors), 'Cell COLORS must be a vector');
assert(numel(data) == numel(colors), '#DATA must macht #COLORS');
if (isvector(colors{1}))
cc = cell(1, numel(colors));
for i=1:numel(colors)
cc{i} = repmat(colors{i}(:), 1, size(data{i}, 2));
end
colors = [cc{:}];
else
colors = [colors{:}];
end
end
data = [data{:}];
end
if (~isempty(data_dims_perm))
if (numel(data_dims_perm) ~= size(data, 1))
error('DATA_DIMS_PERM (negated IDXS) must have as many elements as DATA has rows (2 or 3)')
end
data = data(data_dims_perm, :);
end
%% data-data
simpl_setup_data(data, idxs, colors, va{:});
else
simpl_setup_data(data, [], [], va{:});
end
%% app data
simpl.omx = -1; % old mouse-x position, -1: invalid
simpl.mxy = [0 0];
simpl.wh = [1100 800];
% sp_setup_axes_rect();
% XXX: CODEDUP ^ v
simpl.axxywh = [20 20 simpl.wh-40];
simpl.axxywh(3:4) = max(simpl.axxywh(3:4), [400 300]); % minimum 400 x 300 axes
simpl.zoom = 1;
simpl.ang = 0; % angle around y axis in degrees
simpl.fog = false; % show fog?
simpl.lineidxs = [1 1]; % beginning and end indices of show-as-line XXX: blah
simpl.keycb = [];
if (nargin >= 4)
simpl.keycb = keycb;
end
simpl.displaycb = [];
if (haveDisplayCb)
simpl.displaycb = displaycb;
end
if (glc_have_beginpage())
simpl.moretext = 'Press F12 to take PDF screenshot';
else
simpl.moretext = '';
end
if (nargin < 6)
% no userdata
simpl.ud = [];
else
simpl.ud = ud;
end
simpl.imagenum = 1;
simpl.imagestate = 0;
% create the window!
winid = glcall(glc.newwindow, [20 20], simpl.wh, 'Simple plot');
if (simpl_have_classdef())
simpl_ = simpl;
clear simpl;
global simpl
if (isempty(simpl))
simpl = {};
end
assert(isequal(winid, simpl_getwin()), 'INTERNAL ERROR');
simpl{winid} = simpl_;
end
glcall(glc.setcallback, glc.cb_reshape, 'sp_reshape');
glcall(glc.setcallback, glc.cb_display, 'sp_display');
glcall(glc.setcallback, glc.cb_keyboard, 'sp_keyboard');
glcall(glc.setcallback, glc.cb_motion, 'sp_motion');
glcall(glc.setcallback, glc.cb_mouse, 'sp_mouse');
glcall(glc.entermainloop);
end
function sp_setup_axes_rect()
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
% [x y w h]
simpl.axxywh = [20 20 simpl.wh-40];
simpl.axxywh(3:4) = max(simpl.axxywh(3:4), [400 300]); % minimum 400 x 300 axes
end
function sp_reshape(w, h)
global GL glc
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
simpl.wh = [w h];
sp_setup_axes_rect();
glc_setup2d(w, h);
end
function sp_display()
global GL glc
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
glcall(glc.clear, 1-[0 0 0]);
%% draw axes
axwh = simpl.axxywh([3 4]);
wbyhmpone = [-1 1]*axwh(1)/axwh(2); % width-by-height minus-plus one
glc_axes_setup(simpl.axxywh, [wbyhmpone, -1 1, 10*wbyhmpone], GL.DEPTH_BUFFER_BIT); % {{{
sc = double(max((simpl.max-simpl.min)/2));
scalemat = simpl.zoom.*eye(4)./sc;
scalemat(4,4) = 1;
glcall(glc.mulmatrix, GL.MODELVIEW, scalemat);
glcall(glc.mulmatrix, GL.MODELVIEW, [simpl.ang, 0 1 0]);
center = double((simpl.min+simpl.max)/2);
glcall(glc.mulmatrix, GL.MODELVIEW, -center);
mvpr = glcall(glc.get, GL.PROJECTION_MATRIX)*glcall(glc.get, GL.MODELVIEW_MATRIX);
% inv(mvpr) :: clip coords -> object coords
assert(mvpr(4,4)==1);
if (simpl.fog)
glcall(glc.fog, GL.EXP2, single(0.7), single([1 1 1 0]));
glcall(glc.toggle, [GL.FOG 1]);
end
if (simpl.havelist)
% Successively draw all elements from the list.
for i=1:size(simpl.data, 1)
if (simpl.data{i, 1} == GL.POINTS + 16)
% Specifying GL.POINTS and +16 is redundant, so have this as a special case for:
pointsz = glcall(glc.get, GL.POINT_SIZE);
glcall(glc.set, GL.POINT_SIZE, 4);
end
glcall(glc.draw, simpl.data{i, :});
if (simpl.data{i, 1} == GL.POINTS + 16)
glcall(glc.set, GL.POINT_SIZE, pointsz);
end
end
elseif (isa(simpl.displaycb, 'function_handle'))
% Run user-provided display callback.
simpl.displaycb();
elseif (~simpl.havelist)
% Run our hard-coded (legacy) drawing code.
glcall(glc.toggle, [GL.DEPTH_TEST 1]);
if (simpl.lineidxs(2) > simpl.lineidxs(1))
glcall(glc.draw, GL.LINE_STRIP, simpl.data(:, simpl.lineidxs(1):simpl.lineidxs(2)), ...
struct('colors',[.2 .2 .2]));
end
if (~isempty(simpl.idxs))
opts = struct('indices',simpl.idxs(:));
if (~isempty(simpl.colors))
opts.colors = simpl.colors;
end
glcall(glc.draw, GL.TRIANGLES+16, simpl.data, opts);
else
if (~isempty(simpl.colors))
va = { struct('colors', simpl.colors) };
else
va = {};
end
glcall(glc.draw, GL.POINTS, simpl.data, va{:});
end
end
glc_axes_finish([0 0 0]); % }}}
%% Display some text
top = simpl.axxywh(2)+simpl.axxywh(4)-4;
pretty = @(vec)regexprep(num2str(vec(:)'), ' +', ', ');
glcall(glc.text, [28 top-14], 14, ...
sprintf('means: %s | mins: %s | maxs: %s | fog: %d', pretty(simpl.mean), ...
pretty(simpl.min), pretty(simpl.max), simpl.fog));
str = sprintf('zoom=%.02f, ang=%.02f', simpl.zoom, simpl.ang);
if (~simpl.havelist)
li = simpl.lineidxs;
glcall(glc.text, [28 top-14-(8+14)], 14, ...
sprintf('[%d %d..%d %d], %s', 1, li(1), li(2), simpl.numsamples, str));
else
glcall(glc.text, [28 top-14-(8+14)], 14, str);
end
if (~isempty(simpl.moretext))
glcall(glc.text, [28 top-14-2*(8+14)], 14, simpl.moretext);
if (simpl.imagestate == 1)
simpl.imagestate = 2;
elseif (simpl.imagestate == 2)
% Now we can check for success of gl2psEndPage().
status = glcall(glc.beginpage);
if (status == GL.PS_SUCCESS)
% See SCREENSHOT_PENDING
simpl.moretext = strrep(simpl.moretext, 'pending saving', 'saved');
else
simpl.moretext = strrep(simpl.moretext, 'pending saving', 'NOT saved');
simpl.moretext = sprintf('%s (%s)', simpl.moretext, glc_endpage_errmsg(status));
end
simpl.imagestate = 0;
end
end
%% Coordinates of mouse pointer
[yes, fracs] = glc_pointinxywh(simpl.mxy, simpl.axxywh);
if (simpl.numdims == 2 && yes)
% FACTOROUT
axcenter = simpl.axxywh([1 2])+axwh/2;
% 2*fracs-axcenter: window coords -> normalized device coords:
ndc = ([2*(simpl.mxy-axcenter) 0 1]);
ndc(1:2) = ndc(1:2)./axwh;
assert(abs(ndc) <= 1);
mousedpos = mvpr \ ndc';
glcall(glc.text, [28 top-14-3*(8+14)], 14, ...
sprintf('(x, y) = (%.02f, %.02f)', mousedpos(1), mousedpos(2)));
end
if (simpl.havelist && isa(simpl.displaycb, 'function_handle'))
simpl.displaycb();
end
end
function cval = sp_clamp(val, themin, themax)
cval = min(max(themin, val), themax);
end
function sp_keyboard(key, x, y, mods)
global GL glc
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
% Common
if (key==double('f'))
simpl.fog = ~simpl.fog;
elseif (key == GL.KEY_F12 && glc_have_beginpage())
% Try taking a gl2ps screenshot.
try
fileprefix = evalin('base', 'SIMPLEPLOT_FILE_PREFIX');
catch
fileprefix = '';
end
if (~(ischar(fileprefix) && isvector(fileprefix)))
simpl.moretext = 'SIMPLEPLOT_FILE_PREFIX (in base workspace) must be file prefix';
simpl.imagestate = 0;
else
fileprefix = fileprefix(:).';
fileprefix = sprintf('%s_%02d', fileprefix, simpl.imagenum);
simpl.imagenum = simpl.imagenum + 1;
if (mods == GL.MOD_SHIFT)
bufsize = 1024; % test for GL.PS_OVERFLOW
else
bufsize = 10*1048576;
end
options = GL.PS_TIGHT_BOUNDING_BOX + GL.PS_OCCLUSION_CULL;
[status, fn] = glc_beginpage_ext(GL.PS_EPS, GL.PS_NO_SORT, options, ...
bufsize, fileprefix);
STATUS = { 'failed opening file', 'failed gl2psBeginPage()' };
if (status ~= GL.PS_SUCCESS)
simpl.moretext = sprintf('Screenshot: %s', STATUS{status});
simpl.imagestate = 0;
else
% SCREENSHOT_PENDING
simpl.moretext = sprintf('Screenshot pending saving to "%s"', fn);
simpl.imagestate = 1;
end
return
end
end
if (isa(simpl.keycb, 'function_handle'))
simpl.keycb(key, x, y, mods);
elseif (~simpl.havelist)
mul = (1+9*(~~bitand(mods,GL.MOD_CTRL) + 6*(~~bitand(mods,GL.MOD_SHIFT))));
switch key
case { GL.KEY_RIGHT, GL.KEY_LEFT }
simpl.lineidxs(2) = simpl.lineidxs(2) + mul*(1-2*(key==GL.KEY_LEFT));
simpl.lineidxs(2) = sp_clamp(simpl.lineidxs(2), simpl.lineidxs(1),simpl.numsamples);
case { GL.KEY_UP, GL.KEY_DOWN }
simpl.lineidxs(1) = simpl.lineidxs(1) + mul*(1-2*(key==GL.KEY_DOWN));
simpl.lineidxs(1) = sp_clamp(simpl.lineidxs(1), 1,simpl.lineidxs(2));
end
end
glcall(glc.redisplay);
end
function sp_motion(buttonsdown, x, y)
global GL glc
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
% invert y
simpl.mxy = [x simpl.wh(2)-y];
if (simpl.numdims==3 && bitand(buttonsdown, GL.BUTTON_LEFT))
if (simpl.omx == -1)
simpl.omx = simpl.mxy(1);
else
dx = simpl.omx - simpl.mxy(1);
newang = simpl.ang - dx/6;
if (bitand(buttonsdown, GL.BUTTON_RIGHT))
% RMB: rotate by whole degrees
ok = round(simpl.ang) ~= round(newang);
if (ok)
newang = round(newang);
end
else
ok = true;
end
if (ok)
simpl.omx = simpl.mxy(1);
simpl.ang = mod(newang, 360);
end
end
else
simpl.omx = -1;
end
glcall(glc.redisplay);
end
function sp_mouse(button, downp, x, y, mods)
global GL glc
if (simpl_have_classdef())
simpl = simpl_getobj();
else
global simpl
end
if (downp)
switch button
case GL.MWHEEL_UP,
simpl.zoom = simpl.zoom * (1.2 + 0.3*(mods==GL.MOD_CTRL));
case GL.MWHEEL_DOWN,
simpl.zoom = simpl.zoom / (1.2 + 0.3*(mods==GL.MOD_CTRL));
end
else
simpl.omx = -1;
end
simpl.zoom = sp_clamp(simpl.zoom, 0.1, 1000);
glcall(glc.redisplay);
end