429faed747
Files correlati : pdflib Ricompilazione Demo : [ ] Commento : Aggiornata PDFlib git-svn-id: svn://10.65.10.50/trunk@17433 c028cbd2-c16b-5b4b-a496-9718f37d4682
411 lines
10 KiB
C
Executable File
411 lines
10 KiB
C
Executable File
/*---------------------------------------------------------------------------*
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| PDFlib - A library for generating PDF on the fly |
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+---------------------------------------------------------------------------+
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| Copyright (c) 1997-2006 Thomas Merz and PDFlib GmbH. All rights reserved. |
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+---------------------------------------------------------------------------+
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| |
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| This software is subject to the PDFlib license. It is NOT in the |
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| public domain. Extended versions and commercial licenses are |
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| available, please check http://www.pdflib.com. |
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| |
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*---------------------------------------------------------------------------*/
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/* $Id: p_draw.c,v 1.3 2008-10-20 14:34:15 guy Exp $
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*
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* PDFlib drawing routines
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*
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*/
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#include "p_intern.h"
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#include "p_layer.h"
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#include "p_tagged.h"
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/* Path segment operators */
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static void
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pdf_begin_path(PDF *p)
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{
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if (PDF_GET_STATE(p) == pdf_state_path)
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return;
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pdf_end_text(p);
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PDF_PUSH_STATE(p, "pdf_begin_path", pdf_state_path);
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}
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static void
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pdf_end_path(PDF *p)
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{
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pdf_ppt *ppt = p->curr_ppt;
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PDF_POP_STATE(p, "pdf_end_path");
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ppt->gstate[ppt->sl].x = 0;
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ppt->gstate[ppt->sl].y = 0;
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}
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/* ----------------- Basic functions for API functions --------------*/
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void
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pdf__moveto(PDF *p, pdc_scalar x, pdc_scalar y)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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ppt->gstate[ppt->sl].startx = ppt->gstate[ppt->sl].x = x;
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ppt->gstate[ppt->sl].starty = ppt->gstate[ppt->sl].y = y;
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pdf_begin_path(p);
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pdc_printf(p->out, "%f %f m\n", x, y);
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}
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void
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pdf__rmoveto(PDF *p, pdc_scalar x, pdc_scalar y)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_scalar x_0 = ppt->gstate[ppt->sl].x;
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pdc_scalar y_0 = ppt->gstate[ppt->sl].y;
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdf__moveto(p, x_0 + x, y_0 + y);
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}
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void
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pdf__lineto(PDF *p, pdc_scalar x, pdc_scalar y)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdc_printf(p->out, "%f %f l\n", x, y);
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ppt->gstate[ppt->sl].x = x;
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ppt->gstate[ppt->sl].y = y;
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}
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void
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pdf__rlineto(PDF *p, pdc_scalar x, pdc_scalar y)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_scalar x_0 = ppt->gstate[ppt->sl].x;
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pdc_scalar y_0 = ppt->gstate[ppt->sl].y;
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdf__lineto(p, x_0 + x, y_0 + y);
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}
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void
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pdf__curveto(PDF *p,
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pdc_scalar x_1, pdc_scalar y_1,
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pdc_scalar x_2, pdc_scalar y_2,
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pdc_scalar x_3, pdc_scalar y_3)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_check_number(p->pdc, "x_1", x_1);
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pdc_check_number(p->pdc, "y_1", y_1);
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pdc_check_number(p->pdc, "x_2", x_2);
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pdc_check_number(p->pdc, "y_2", y_2);
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pdc_check_number(p->pdc, "x_3", x_3);
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pdc_check_number(p->pdc, "y_3", y_3);
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/* second c.p. coincides with final point */
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if (fabs(x_2 - x_3) < PDC_FLOAT_PREC &&
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fabs(y_2 - y_3) < PDC_FLOAT_PREC)
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pdc_printf(p->out, "%f %f %f %f y\n", x_1, y_1, x_3, y_3);
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/* general case with four distinct points */
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else
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pdc_printf(p->out, "%f %f %f %f %f %f c\n",
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x_1, y_1, x_2, y_2, x_3, y_3);
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ppt->gstate[ppt->sl].x = x_3;
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ppt->gstate[ppt->sl].y = y_3;
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}
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void
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pdf__rcurveto(PDF *p,
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pdc_scalar x_1, pdc_scalar y_1,
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pdc_scalar x_2, pdc_scalar y_2,
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pdc_scalar x_3, pdc_scalar y_3)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_scalar x_0 = ppt->gstate[ppt->sl].x;
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pdc_scalar y_0 = ppt->gstate[ppt->sl].y;
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pdc_check_number(p->pdc, "x_1", x_1);
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pdc_check_number(p->pdc, "y_1", y_1);
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pdc_check_number(p->pdc, "x_2", x_2);
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pdc_check_number(p->pdc, "y_2", y_2);
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pdc_check_number(p->pdc, "x_3", x_3);
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pdc_check_number(p->pdc, "y_3", y_3);
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pdf__curveto(p, x_0 + x_1, y_0 + y_1,
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x_0 + x_2, y_0 + y_2,
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x_0 + x_3, y_0 + y_3);
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}
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void
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pdf_rrcurveto(PDF *p,
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pdc_scalar x_1, pdc_scalar y_1,
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pdc_scalar x_2, pdc_scalar y_2,
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pdc_scalar x_3, pdc_scalar y_3)
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{
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pdf__rcurveto(p, x_1, y_1,
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x_1 + x_2, y_1 + y_2,
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x_1 + x_2 + x_3, y_1 + y_2 + y_3);
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}
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void
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pdf_hvcurveto(PDF *p, pdc_scalar x_1, pdc_scalar x_2,
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pdc_scalar y_2, pdc_scalar y_3)
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{
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pdf_rrcurveto(p, x_1, 0, x_2, y_2, 0, y_3);
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}
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void
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pdf_vhcurveto(PDF *p, pdc_scalar y_1, pdc_scalar x_2,
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pdc_scalar y_2, pdc_scalar x_3)
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{
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pdf_rrcurveto(p, 0, y_1, x_2, y_2, x_3, 0);
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}
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void
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pdf__rect(PDF *p, pdc_scalar x, pdc_scalar y,
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pdc_scalar width, pdc_scalar height)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdc_check_number(p->pdc, "width", width);
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pdc_check_number(p->pdc, "height", height);
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ppt->gstate[ppt->sl].startx = ppt->gstate[ppt->sl].x = x;
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ppt->gstate[ppt->sl].starty = ppt->gstate[ppt->sl].y = y;
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pdf_begin_path(p);
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pdc_printf(p->out, "%f %f %f %f re\n", x, y, width, p->ydirection * height);
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}
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/* 4/3 * (1-cos 45<34>)/sin 45<34> = 4/3 * sqrt(2) - 1 */
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#define ARC_MAGIC (0.552284749)
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static void
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pdf_short_arc(PDF *p, pdc_scalar x, pdc_scalar y, pdc_scalar r,
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pdc_scalar alpha, pdc_scalar beta)
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{
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pdc_scalar bcp;
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pdc_scalar cos_alpha, cos_beta, sin_alpha, sin_beta;
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alpha = alpha * PDC_DEG2RAD;
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beta = beta * PDC_DEG2RAD;
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/* This formula yields ARC_MAGIC for alpha == 0, beta == 90 degrees */
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bcp = (4.0/3 * (1 - cos((beta - alpha)/2)) / sin((beta - alpha)/2));
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sin_alpha = sin(alpha);
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sin_beta = sin(beta);
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cos_alpha = cos(alpha);
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cos_beta = cos(beta);
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pdf__curveto(p,
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x + r * (cos_alpha - bcp * sin_alpha), /* p1 */
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y + r * (sin_alpha + bcp * cos_alpha),
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x + r * (cos_beta + bcp * sin_beta), /* p2 */
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y + r * (sin_beta - bcp * cos_beta),
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x + r * cos_beta, /* p3 */
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y + r * sin_beta);
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}
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static void
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pdf_orient_arc(PDF *p, pdc_scalar x, pdc_scalar y, pdc_scalar r,
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pdc_scalar alpha, pdc_scalar beta, pdc_scalar orient)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_scalar rad_a = alpha * PDC_DEG2RAD;
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pdc_scalar startx = (x + r * cos(rad_a));
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pdc_scalar starty = (y + r * sin(rad_a));
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if (PDF_GET_STATE(p) != pdf_state_path)
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{
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pdf__moveto(p, startx, starty); /* this enters pdf_state_path */
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}
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else if ((ppt->gstate[ppt->sl].x != startx
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|| ppt->gstate[ppt->sl].y != starty))
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{
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pdf__lineto(p, startx, starty);
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}
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if (orient > 0)
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{
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while (beta < alpha)
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beta += 360;
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if (alpha == beta)
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return;
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while (beta - alpha > 90)
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{
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pdf_short_arc(p, x, y, r, alpha, alpha + 90);
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alpha += 90;
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}
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}
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else
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{
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while (alpha < beta)
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alpha += 360;
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if (alpha == beta)
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return;
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while (alpha - beta > 90)
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{
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pdf_short_arc(p, x, y, r, alpha, alpha - 90);
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alpha -= 90;
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}
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}
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if (alpha != beta)
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pdf_short_arc(p, x, y, r, alpha, beta);
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}
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void
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pdf__arc(PDF *p, pdc_scalar x, pdc_scalar y, pdc_scalar r,
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pdc_scalar alpha, pdc_scalar beta)
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{
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdc_check_number_limits(p->pdc, "r", r, PDC_FLOAT_PREC, PDC_FLOAT_MAX);
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pdc_check_number(p->pdc, "alpha", alpha);
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pdc_check_number(p->pdc, "beta", beta);
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pdf_orient_arc(p, x, y, r,
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p->ydirection * alpha, p->ydirection * beta, p->ydirection);
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}
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void
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pdf__arcn(PDF *p, pdc_scalar x, pdc_scalar y, pdc_scalar r,
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pdc_scalar alpha, pdc_scalar beta)
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{
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdc_check_number_limits(p->pdc, "r", r, PDC_FLOAT_PREC, PDC_FLOAT_MAX);
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pdc_check_number(p->pdc, "alpha", alpha);
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pdc_check_number(p->pdc, "beta", beta);
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pdf_orient_arc(p, x, y, r,
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p->ydirection * alpha, p->ydirection * beta, -p->ydirection);
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}
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void
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pdf__circle(PDF *p, pdc_scalar x, pdc_scalar y, pdc_scalar r)
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{
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pdc_check_number(p->pdc, "x", x);
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pdc_check_number(p->pdc, "y", y);
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pdc_check_number_limits(p->pdc, "r", r, PDC_FLOAT_PREC, PDC_FLOAT_MAX);
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/*
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* pdf_begin_path() not required since we descend to other
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* path segment functions.
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*/
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/* draw four Bezier curves to approximate a circle */
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pdf__moveto(p, x + r, y);
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pdf__curveto(p, x + r, y + r*ARC_MAGIC, x + r*ARC_MAGIC, y + r, x, y + r);
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pdf__curveto(p, x - r*ARC_MAGIC, y + r, x - r, y + r*ARC_MAGIC, x - r, y);
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pdf__curveto(p, x - r, y - r*ARC_MAGIC, x - r*ARC_MAGIC, y - r, x, y - r);
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pdf__curveto(p, x + r*ARC_MAGIC, y - r, x + r, y - r*ARC_MAGIC, x + r, y);
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pdf__closepath(p);
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}
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void
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pdf__closepath(PDF *p)
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{
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pdf_ppt *ppt = p->curr_ppt;
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pdc_puts(p->out, "h\n");
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ppt->gstate[ppt->sl].x = ppt->gstate[ppt->sl].startx;
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ppt->gstate[ppt->sl].y = ppt->gstate[ppt->sl].starty;
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}
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void
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pdf__endpath(PDF *p)
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{
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pdc_puts(p->out, "n\n");
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pdf_end_path(p);
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}
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void
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pdf__stroke(PDF *p)
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{
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pdc_puts(p->out, "S\n");
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pdf_end_path(p);
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}
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void
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pdf__closepath_stroke(PDF *p)
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{
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pdc_puts(p->out, "s\n");
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pdf_end_path(p);
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}
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void
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pdf__fill(PDF *p)
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{
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if (p->curr_ppt->fillrule == pdf_fill_winding)
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pdc_puts(p->out, "f\n");
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else if (p->curr_ppt->fillrule == pdf_fill_evenodd)
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pdc_puts(p->out, "f*\n");
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pdf_end_path(p);
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}
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void
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pdf__fill_stroke(PDF *p)
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{
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if (p->curr_ppt->fillrule == pdf_fill_winding)
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pdc_puts(p->out, "B\n");
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else if (p->curr_ppt->fillrule == pdf_fill_evenodd)
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pdc_puts(p->out, "B*\n");
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pdf_end_path(p);
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}
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void
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pdf__closepath_fill_stroke(PDF *p)
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{
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if (p->curr_ppt->fillrule == pdf_fill_winding)
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pdc_puts(p->out, "b\n");
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else if (p->curr_ppt->fillrule == pdf_fill_evenodd)
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pdc_puts(p->out, "b*\n");
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pdf_end_path(p);
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}
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void
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pdf__clip(PDF *p)
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{
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if (p->curr_ppt->fillrule == pdf_fill_winding)
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pdc_puts(p->out, "W n\n");
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else if (p->curr_ppt->fillrule == pdf_fill_evenodd)
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pdc_puts(p->out, "W* n\n");
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pdf_end_path(p);
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}
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