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ext_gstate_demo.c
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/*
* << Haru Free PDF Library 2.0.0 >> -- ext_gstate_demo.c
*
* Copyright (c) 1999-2006 Takeshi Kanno <[email protected]>
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
* It is provided "as is" without express or implied warranty.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include "hpdf.h"
#include "grid_sheet.h"
jmp_buf env;
#ifdef HPDF_DLL
void __stdcall
#else
void
#endif
error_handler (HPDF_STATUS error_no,
HPDF_STATUS detail_no,
void *user_data)
{
printf ("ERROR: error_no=%04X, detail_no=%u\n", (HPDF_UINT)error_no,
(HPDF_UINT)detail_no);
longjmp(env, 1);
}
void
draw_circles (HPDF_Page page, const char *description, HPDF_REAL x, HPDF_REAL y)
{
HPDF_Page_SetLineWidth (page, 1.0f);
HPDF_Page_SetRGBStroke (page, 0.0f, 0.0f, 0.0f);
HPDF_Page_SetRGBFill (page, 1.0f, 0.0f, 0.0f);
HPDF_Page_Circle (page, x + 40, y + 40, 40);
HPDF_Page_ClosePathFillStroke (page);
HPDF_Page_SetRGBFill (page, 0.0f, 1.0f, 0.0f);
HPDF_Page_Circle (page, x + 100, y + 40, 40);
HPDF_Page_ClosePathFillStroke (page);
HPDF_Page_SetRGBFill (page, 0.0f, 0.0f, 1.0f);
HPDF_Page_Circle (page, x + 70, y + 74.64, 40);
HPDF_Page_ClosePathFillStroke (page);
HPDF_Page_SetRGBFill (page, 0.0f, 0.0f, 0.0f);
HPDF_Page_BeginText (page);
HPDF_Page_TextOut (page, x + 0.0f, y + 130.0f, description);
HPDF_Page_EndText (page);
}
int
main (int argc, char **argv)
{
HPDF_Doc pdf;
HPDF_Page page;
char fname[256];
HPDF_Font hfont;
HPDF_ExtGState gstate;
const HPDF_REAL PAGE_WIDTH = 600;
const HPDF_REAL PAGE_HEIGHT = 900;
strcpy (fname, argv[0]);
strcat (fname, ".pdf");
pdf = HPDF_New (error_handler, NULL);
if (!pdf) {
printf ("error: cannot create PdfDoc object\n");
return 1;
}
if (setjmp(env)) {
HPDF_Free (pdf);
return 1;
}
hfont = HPDF_GetFont (pdf, "Helvetica-Bold", NULL);
/* add a new page object. */
page = HPDF_AddPage (pdf);
HPDF_Page_SetFontAndSize (page, hfont, 10);
HPDF_Page_SetHeight (page, PAGE_HEIGHT);
HPDF_Page_SetWidth (page, PAGE_WIDTH);
/* normal */
HPDF_Page_GSave (page);
draw_circles (page, "normal", 40.0f, PAGE_HEIGHT - 170);
HPDF_Page_GRestore (page);
/* transparency (0.8) */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetAlphaFill (gstate, 0.8);
HPDF_ExtGState_SetAlphaStroke (gstate, 0.8);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "alpha fill = 0.8", 230.0f, PAGE_HEIGHT - 170);
HPDF_Page_GRestore (page);
/* transparency (0.4) */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetAlphaFill (gstate, 0.4);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "alpha fill = 0.4", 420.0f, PAGE_HEIGHT - 170);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_MULTIPLY */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_MULTIPLY);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_MULTIPLY", 40.0f, PAGE_HEIGHT - 340);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_SCREEN */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_SCREEN);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_SCREEN", 230.0f, PAGE_HEIGHT - 340);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_OVERLAY */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_OVERLAY);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_OVERLAY", 420.0f, PAGE_HEIGHT - 340);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_DARKEN */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_DARKEN);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_DARKEN", 40.0f, PAGE_HEIGHT - 510);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_LIGHTEN */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_LIGHTEN);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_LIGHTEN", 230.0f, PAGE_HEIGHT - 510);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_COLOR_DODGE */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_COLOR_DODGE);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_COLOR_DODGE", 420.0f, PAGE_HEIGHT - 510);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_COLOR_BUM */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_COLOR_BUM);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_COLOR_BUM", 40.0f, PAGE_HEIGHT - 680);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_HARD_LIGHT */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_HARD_LIGHT);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_HARD_LIGHT", 230.0f, PAGE_HEIGHT - 680);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_SOFT_LIGHT */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_SOFT_LIGHT);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_SOFT_LIGHT", 420.0f, PAGE_HEIGHT - 680);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_DIFFERENCE */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_DIFFERENCE);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_DIFFERENCE", 40.0f, PAGE_HEIGHT - 850);
HPDF_Page_GRestore (page);
/* blend-mode=HPDF_BM_EXCLUSHON */
HPDF_Page_GSave (page);
gstate = HPDF_CreateExtGState (pdf);
HPDF_ExtGState_SetBlendMode (gstate, HPDF_BM_EXCLUSHON);
HPDF_Page_SetExtGState (page, gstate);
draw_circles (page, "HPDF_BM_EXCLUSHON", 230.0f, PAGE_HEIGHT - 850);
HPDF_Page_GRestore (page);
/* save the document to a file */
HPDF_SaveToFile (pdf, fname);
/* clean up */
HPDF_Free (pdf);
return 0;
}