grid.c

spice中支持多层次元件模型仿真的可单独运行的插件源码

    graph->datawindow.xmax = graph->data.xmax;
    graph->datawindow.ymin = graph->data.ymin;
    graph->datawindow.ymax = graph->data.ymax;
    if (mx > my) {
	graph->datawindow.ymin -= (mx - my) / 2;
	graph->datawindow.ymax += (mx - my) / 2;
    } else if (mx < my) {
	graph->datawindow.xmin -= (my - mx) / 2;
	graph->datawindow.xmax += (my - mx) / 2;
    }

    /* Range is square with upper bound maxrad */

#ifdef notdef
    xx = graph->datawindow.xmin + graph->datawindow.xmax;
    yy = graph->datawindow.ymin + graph->datawindow.ymax;
    graph->datawindow.xmin = xx - maxrad;
    graph->datawindow.xmax = xx + maxrad;
    graph->datawindow.ymin = yy - maxrad;
    graph->datawindow.ymax = yy + maxrad;
#endif


#ifdef notdef
    if (ft_grdb)
        printf("polar: maxrad = %g, center = (%g, %g)\n", maxrad, xx, yy);

    if ((minrad == 0) && ((hmt - lmt) > 5)) {
        if (!((hmt - lmt) % 2))
            step = 2;
        else if (!((hmt - lmt) % 3))
            step = 3;
        else 
            step = 1;
    } else
        step = 1;

	graph->grid.xaxis.circular.lmt = lmt;
	graph->grid.yaxis.circular.lmt = step;
#endif

    graph->grid.xaxis.circular.hmt = hmt;
    graph->grid.xaxis.circular.lmt = lmt;
    graph->grid.xaxis.circular.mag = mag;

#ifdef notdef
    graph->datawindow.xmin = xx - maxrad;
    graph->datawindow.xmax = xx + maxrad;
    graph->datawindow.ymin = yy - maxrad;
    graph->datawindow.ymax = yy + maxrad;
#endif

}


static void
drawpolargrid(graph)
GRAPH *graph;
{
    double mx, my, rad, tenpowmag, theta;
    int hmt, lmt, i, step, mag;
    int relcx, relcy, relrad, dist, degs;
    int x1, y1, x2, y2;
    double minrad, maxrad, pixperunit, xx, yy;
    char buf[64];

#ifdef notdef
    step = graph->grid.yaxis.circular.lmt;
    mag = floor(mylog10(maxrad));
    tenpowmag = pow(10.0, (double) mag);
    pixperunit = graph->grid.xaxis.circular.radius / (maxrad - minrad);
#endif
    hmt = graph->grid.xaxis.circular.hmt;
    lmt = graph->grid.xaxis.circular.lmt;
    mag = graph->grid.xaxis.circular.mag;
    tenpowmag = pow(10.0, (double) mag);
    maxrad = hmt * tenpowmag;
    minrad = lmt * tenpowmag; 

    if ((minrad == 0) && ((hmt - lmt) > 5)) {
	if (!((hmt - lmt) % 2))
	    step = 2;
	else if (!((hmt - lmt) % 3))
	    step = 3;
	else
	    step = 1;
	} else
	    step = 1;
    pixperunit = graph->grid.xaxis.circular.radius * 2 /
	(graph->datawindow.xmax - graph->datawindow.xmin);

    relcx = - (graph->datawindow.xmin + graph->datawindow.xmax) / 2
            * pixperunit;
    relcy = - (graph->datawindow.ymin + graph->datawindow.ymax) / 2
            * pixperunit;

    /* The distance from the center of the plotting area to the center of
     * the logical area.
     */
    dist = sqrt((double) (relcx * relcx + relcy * relcy));

    SetLinestyle(0);
    Arc(graph->grid.xaxis.circular.center,
            graph->grid.yaxis.circular.center,
            graph->grid.xaxis.circular.radius,
            (double) 0.0, (double) 0.0);
    SetLinestyle(1);

    /* Now draw the circles. */
    for (i = lmt;
	(relrad = i * tenpowmag * pixperunit)
	<= dist + graph->grid.xaxis.circular.radius;
	i += step)
    {
        cliparc((double) graph->grid.xaxis.circular.center + relcx,
                (double) graph->grid.yaxis.circular.center + relcy,
                (double) relrad, 0.0, 0.0,
                graph->grid.xaxis.circular.center,
                graph->grid.yaxis.circular.center,
                graph->grid.xaxis.circular.radius, 0);
        /* Toss on the label */
        if (relcx || relcy)
            theta = atan2((double) relcy, (double) relcx);
        else
            theta = M_PI;
        if (i && (relrad > dist - graph->grid.xaxis.circular.radius))
            addradlabel(graph, i, theta,
                (int) (graph->grid.xaxis.circular.center -
                    (relrad - dist) * cos(theta)),
                (int) (graph->grid.yaxis.circular.center
                    - (relrad - dist) * sin(theta)));
    }

    /* Now draw the spokes.  We have two possible cases -- first, the
     * origin may be inside the area -- in this case draw 12 spokes.
     * Otherwise, draw several spokes at convenient places.
     */
    if ((graph->datawindow.xmin <= 0.0)
            && (graph->datawindow.xmax >= 0.0)
            && (graph->datawindow.ymin <= 0.0)
            && (graph->datawindow.ymax >= 0.0)) {
        for (i = 0; i < 12; i++) {
            x1 = graph->grid.xaxis.circular.center + relcx;
            y1 = graph->grid.yaxis.circular.center + relcy;
            x2 = x1 + graph->grid.xaxis.circular.radius * 2
                    * cos(i * M_PI / 6);
            y2 = y1 + graph->grid.xaxis.circular.radius * 2
                    * sin(i * M_PI / 6);
            if (!clip_to_circle(&x1, &y1, &x2, &y2,
                    graph->grid.xaxis.circular.center,
                    graph->grid.yaxis.circular.center,
                    graph->grid.xaxis.circular.radius))
            {
	        DrawLine(x1, y1, x2, y2); 
                /* Add a label here */
		/*XXXX*/
                adddeglabel(graph, i * 30, x2, y2, x1, y1,
		    graph->grid.xaxis.circular.center,
		    graph->grid.yaxis.circular.center);
            }
        }
    } else {
        /* Figure out the angle that we have to fill up */
        theta = 2 * asin((double) graph->grid.xaxis.circular.radius
                / dist);
        theta = theta * 180 / M_PI;   /* Convert to degrees. */
        
        /* See if we should put lines at 30, 15, 5, or 1 degree 
         * increments.
         */
        if (theta / 30 > 3)
            degs = 30;
        else if (theta / 15 > 3)
            degs = 15;
        else if (theta / 5 > 3)
            degs = 5;
        else
            degs = 1;

        /* We'll be cheap */
        for (i = 0; i < 360; i+= degs) {
            x1 = graph->grid.xaxis.circular.center + relcx;
            y1 = graph->grid.yaxis.circular.center + relcy;
            x2 = x1 + dist * 2 * cos(i * M_PI / 180);
            y2 = y1 + dist * 2 * sin(i * M_PI / 180);
            if (!clip_to_circle(&x1, &y1, &x2, &y2,
                    graph->grid.xaxis.circular.center,
                    graph->grid.yaxis.circular.center,
                    graph->grid.xaxis.circular.radius)) {
                DrawLine(x1, y1, x2, y2);
                /* Put on the label */
                adddeglabel(graph, i, x2, y2, x1, y1,
		    graph->grid.xaxis.circular.center,
		    graph->grid.yaxis.circular.center);
            }
        }
    }

    (void) sprintf(buf, "e%d", mag);
    Text(buf, graph->grid.xaxis.circular.center
              + graph->grid.xaxis.circular.radius,
            graph->grid.yaxis.circular.center
              - graph->grid.xaxis.circular.radius);
    Update();
    return;
}

/* Put a degree label on the screen, with 'deg' as the label, near point (x, y)
 * such that the perpendicular to (cx, cy) and (x, y) doesn't overwrite the
 * label.  If the distance between the center and the point is
 * too small, don't put the label on.
 */

#define LOFF    5
#define MINDIST 10

static void
adddeglabel(graph, deg, x, y, cx, cy, lx, ly)
    GRAPH *graph;
    int deg, x, y, cx, cy, lx, ly;
{
    char buf[8];
    int d, w, h;
    double angle;

    if (sqrt((double) (x - cx) * (x - cx) + (y - cy) * (y - cy)) < MINDIST)
        return;
    (void) sprintf(buf, "%d", deg);
    w = graph->fontwidth * (strlen(buf) + 1);
    h = graph->fontheight * 1.5;
    angle = atan2((double) (y - ly), (double) (x - lx));
    d = fabs(cos(angle)) * w / 2 + fabs(sin(angle)) * h / 2 + LOFF;

    x = x + d * cos(angle) - w / 2;
    y = y + d * sin(angle) - h / 2;

    Text(buf, x, y);
    Text("o", x + strlen(buf) * graph->fontwidth,
            y + graph->fontheight / 2, 0);
    return;
}

/* This is kind of wierd. If dist = 0, then this is the normal case, where
 * the labels should go along the positive X-axis.  Otherwise, to make
 * sure that all circles drawn have labels, put the label near the circle
 * along the line from the logical center to the physical center.
 */

static void
addradlabel(graph, lab, theta, x, y)
    GRAPH *graph;
    double theta;
    int lab, x, y;
{
    char buf[32];

    (void) sprintf(buf, "%d", lab);
    if (theta == M_PI) {
        y = y - graph->fontheight - 2;
        x = x - graph->fontwidth * strlen(buf) - 3;
    } else
	x = x - graph->fontwidth * strlen(buf) - 3;
    Text(buf, x, y);
    return;
}


/* Smith charts. */

#define gr_xcenter	graph->grid.xaxis.circular.center
#define gr_ycenter	graph->grid.yaxis.circular.center
#define gr_radius	graph->grid.xaxis.circular.radius
#define gi_fntwidth	graph->fontwidth
#define gi_fntheight	graph->fontheight
#define gi_maxx		graph->viewport.width+graph->viewportxoff
#define gr_xmargin	graph->viewportxoff
#define gr_ymargin	graph->viewportyoff

static void
smithgrid(graph)
GRAPH *graph;
{
    double mx, my;
    bool centered = false;

    SetLinestyle(0);

    /* Make sure that our area is square. */
    if (graph->viewport.width > graph->viewport.height) {
        graph->viewport.width =  graph->viewport.height;
    } else {
        graph->viewport.height = graph->viewport.width;
    }

    /* Make sure that the borders are even */
    if (graph->viewport.width & 1) {
	graph->viewport.width += 1;
	graph->viewport.height += 1;
    }

    graph->grid.xaxis.circular.center = graph->viewport.width / 2
                        + graph->viewportxoff;
    graph->grid.yaxis.circular.center = graph->viewport.height / 2
                        + graph->viewportyoff;
    graph->grid.xaxis.circular.radius = graph->viewport.width / 2;


    /* We have to make sure that the range is square. */
    graph->datawindow.xmin = graph->data.xmin;
    graph->datawindow.xmax = graph->data.xmax;
    graph->datawindow.ymin = graph->data.ymin;
    graph->datawindow.ymax = graph->data.ymax;

    if (graph->datawindow.ymin > 0)
	graph->datawindow.ymin *= -1;
    if (graph->datawindow.xmin > 0)
	graph->datawindow.xmin *= -1;

    if (graph->datawindow.ymax < 0)
	graph->datawindow.ymax *= -1;
    if (graph->datawindow.xmax < 0)
	graph->datawindow.xmax *= -1;

    if (fabs(graph->datawindow.ymin) > fabs(graph->datawindow.ymax))
        graph->datawindow.ymax = - graph->datawindow.ymin;
    else
        graph->datawindow.ymin = - graph->datawindow.ymax;

    if (fabs(graph->datawindow.xmin) > fabs(graph->datawindow.xmax))
        graph->datawindow.xmax = - graph->datawindow.xmin;
    else
        graph->datawindow.xmin = - graph->datawindow.xmax;

    mx = graph->datawindow.xmax - graph->datawindow.xmin;
    my = graph->datawindow.ymax - graph->datawindow.ymin;
    if (mx > my) {
        graph->datawindow.ymin -= (mx - my) / 2;
        graph->datawindow.ymax += (mx - my) / 2;
    } else if (mx < my) {
        graph->datawindow.xmin -= (my - mx) / 2;
        graph->datawindow.xmax += (my - mx) / 2;
    }

    if ((graph->datawindow.xmin == - graph->datawindow.xmax) && 
	    (graph->datawindow.ymin == -
	    graph->datawindow.ymax) && (graph->datawindow.xmin == 
	    graph->datawindow.ymin))
	centered = true;

#ifdef notdef
    /* Figure out the minimum and maximum radii we're dealing with. */
    mx = (graph->datawindow.xmin + graph->datawindow.xmax) / 2;
    my = (graph->datawindow.ymin + graph->datawindow.ymax) / 2;
    d = sqrt(mx * mx + my * my);
    maxrad = d + (graph->datawindow.xmax - graph->datawindow.xmin) / 2;
    minrad = d - (graph->datawindow.xmax - graph->datawindow.xmin) / 2;
#endif

    /* Issue a warning if our data range is not normalized */
    if (graph->datawindow.ymax > 1.1) {
	printf("\nwarning: exceeding range for smith chart");
	printf("\nplease normalize your data to -1 < r < +1\n");
    }

}

/* maximum number of circles */
#define CMAX  50

static void
drawsmithgrid(graph)
GRAPH *graph;
{
    double mx, my, rad, tenpowmag, d, dphi[CMAX], minrad, maxrad, rnorm[CMAX];
    double pixperunit;
    int mag, i, j, k;
    double ir[CMAX], rr[CMAX], ki[CMAX], kr[CMAX], ks[CMAX];
    int xoff, yoff, zheight;
    int basemag, plen;
    char buf[64], plab[32], nlab[32];

    /* Figure out the minimum and maximum radii we're dealing with. */
    mx = (graph->datawindow.xmin + graph->datawindow.xmax) / 2;
    my = (graph->datawindow.ymin + graph->datawindow.ymax) / 2;
    d = sqrt(mx * mx + my * my);
    maxrad = d + (graph->datawindow.xmax - graph->datawindow.xmin) / 2;
    minrad = d - (graph->datawindow.xmax - graph->datawindow.xmin) / 2;

    mag = floor(mylog10(maxrad));
    tenpowmag = pow(10.0, (double) mag);

    pixperunit = graph->viewport.width / (graph->datawindow.xmax - 
            graph->datawindow.xmin);

    xoff = - pixperunit * (graph->datawindow.xmin + graph->datawindow.xmax) / 2;
    yoff = - pixperunit * (graph->datawindow.ymin + graph->datawindow.ymax) / 2;

    /* Sweep the range from 10e-20 to 10e20.  If any arcs fall into the
     * picture, plot the arc set.
     */
    for (mag = -20; mag < 20; mag++) {
        i = gr_radius * pow(10.0, (double) mag) / maxrad;
        if (i > 10) {
            j = 1;
            break;
        } else if (i > 5) {
            j = 2;
            break;