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: / usr / share / graphviz / lefty /
Filename : slides.lefty
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load ('def.lefty');
definit ();
#
# initialize window data
#
canvas = defcanvas;
wrect = [0 = ['x' = 0; 'y' = 0;]; 1 = ['x' = 800; 'y' = 1000;];];
lmargin = 100;
width = 800;
height = 1000;
setwidgetattr (canvas, ['window' = wrect;]);
fonts = [
    'timr' = [
        14 = 'timr14';
        18 = 'timr18';
        24 = 'timr24';
    ];
    'courr' = [
        14 = 'courr14';
        18 = 'courr18';
        24 = 'courr24';
    ];
];
x2ps = [
    'timr24' = 'Times-Roman';
    'timr18' = 'Times-Roman';
    'timr14' = 'Times-Roman';
    'courr24' = 'Courier';
    'courr18' = 'Courier';
    'courr14' = 'Courier';
];

calc = function () {
    local i, j, cpos, tsiz, dist, slidep;
    tsiz = ['x' = 0; 'y' = 0;];
    for (i = 0; slides[i]; i = i + 1) {
        slidep = slides[i];
        if (slidep.skip) {
            tsiz.y = tsiz.y + slidep.skip;
        } else {
            for (j = 0; slidep.text[j]; j = j + 1) {
                if (j > 0)
                    tsiz.y = tsiz.y + 5;
                if (~slidep.font)
                    slidep.font = slides.font;
                if (~slidep.size)
                    slidep.size = slides.size;
                if (~slidep.just)
                    slidep.just = slides.just;
                slidep.tsiz[j] = textsize (canvas, slidep.text[j],
                        fonts[slidep.font][slidep.size], 0);
                tsiz.y = tsiz.y + slidep.tsiz[j].y;
            }
        }
    }
    dist = (height - tsiz.y) / (i + 1);
    cpos = ['x' = lmargin; 'y' = height - dist;];
    for (i = 0; slides[i]; i = i + 1) {
        slidep = slides[i];
        if (slidep.skip) {
            cpos.y = cpos.y - slidep.skip - dist;
        } else {
            for (j = 0; slidep.text[j]; j = j + 1) {
                if (j > 0)
                    cpos.y = cpos.y - 5;
                if (slidep.just == 0)
                    slidep.tpos[j].x = cpos.x;
                else
                    slidep.tpos[j].x = width / 2;
                cpos.y = cpos.y - slidep.tsiz[j].y;
                slidep.tpos[j].y = cpos.y;
            }
            cpos.y = cpos.y - dist;
        }
    }
};
redraw = function () {
    local i, j, slidep;
    for (i = 0; slides[i]; i = i + 1) {
        slidep = slides[i];
        if (~slidep.skip)
            for (j = 0; slidep.text[j]; j = j + 1)
                text (canvas, slidep, slidep.tpos[j], slidep.text[j],
                        fonts[slidep.font][slidep.size], 0, slidep.just);
    }
};
dops = function () {
    local i, j, slidep, r;

    r = [0 = ['x' = 0; 'y' = 0;]; 1 = ['x' = 8 * 300; 'y' = 10.5 * 300;];];
    canvas = createwidget (-1, ['type' = 'ps'; 'origin' = r[0]; 'size' = r[1]
;]);
    setwidgetattr (canvas, ['window' = wrect;]);
    for (i = 0; slides[i]; i = i + 1) {
        slidep = slides[i];
        if (~slidep.skip)
            for (j = 0; slidep.text[j]; j = j + 1)
                text (canvas, slidep, slidep.tpos[j], slidep.text[j],
                        x2ps[fonts[slidep.font][slidep.size]],
                        slidep.tsiz[j].y, slidep.just, 1);
    }
    destroywidget (canvas);
    canvas=defcanvas;
};
doit = function () {
    calc ();
    redraw ();
    dops ();
};