105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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/*
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curves.c : CURVE structure managment
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Jean-Philippe Meuret
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(Inspired of atsh-curves.c Oscar Pablo Di Liscia / Juan Pampin)
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*/
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#include <stdlib.h>
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#include <float.h>
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#include "atsa.h"
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/////////////////////////////////////////////////////////////////////////////
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void curve_init(CURVE *curve)
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{
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// Identity function.
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curve->num_ctlpoints = 2;
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curve->ctlpoint = malloc(curve->num_ctlpoints * sizeof(curve->ctlpoint[0]));
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curve->ctlpoint[0][0] = 0.0;
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curve->ctlpoint[0][1] = 0.0;
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curve->ctlpoint[1][0] = 1.0;
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curve->ctlpoint[1][1] = 1.0;
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}
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/////////////////////////////////////////////////////////////////////////////
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void curve_free(CURVE *curve)
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{
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if (curve->ctlpoint)
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{
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free(curve->ctlpoint);
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curve->ctlpoint = 0;
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curve->num_ctlpoints = 0;
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}
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}
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/////////////////////////////////////////////////////////////////////////////
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//returns the number of control points of the curve
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int get_nbp(CURVE *curve)
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{
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return curve->num_ctlpoints;
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the x value of the curve at the given control point
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double get_x_value(CURVE *curve, int i_point)
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{
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return curve->ctlpoint[i_point][0];
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the x value of the curve at the given control point
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double get_y_value(CURVE *curve, int i_point)
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{
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return curve->ctlpoint[i_point][1];
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the minimum x value of the curve
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double get_minx_value(CURVE *curve)
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{
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double minx = DBL_MAX;
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int i_pt;
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for (i_pt = 0 ; i_pt < curve->num_ctlpoints; i_pt++)
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if (curve->ctlpoint[i_pt][0] < minx)
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minx = curve->ctlpoint[i_pt][0];
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return minx;
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the minimum x value of the curve
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double get_maxx_value(CURVE *curve)
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{
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double maxx = -DBL_MAX;
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int i_pt;
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for (i_pt = 0 ; i_pt < curve->num_ctlpoints; i_pt++)
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if (curve->ctlpoint[i_pt][0] > maxx)
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maxx = curve->ctlpoint[i_pt][0];
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return maxx;
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the minimum y value of the curve
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double get_miny_value(CURVE *curve)
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{
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double miny = DBL_MAX;
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int i_pt;
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for (i_pt = 0 ; i_pt < curve->num_ctlpoints; i_pt++)
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if (curve->ctlpoint[i_pt][1] < miny)
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miny = curve->ctlpoint[i_pt][0];
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return miny;
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}
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////////////////////////////////////////////////////////////////////////////
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//returns the minimum y value of the curve
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double get_maxy_value(CURVE *curve)
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{
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double maxy = -DBL_MAX;
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int i_pt;
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for (i_pt = 0 ; i_pt < curve->num_ctlpoints; i_pt++)
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if (curve->ctlpoint[i_pt][1] > maxy)
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maxy = curve->ctlpoint[i_pt][0];
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return maxy;
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}
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