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/* $Id: plotctx.c,v 1.6 2015/07/06 08:05:44 kristaps Exp $ */
/*
* Copyright (c) 2014 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "compat.h"
#include <assert.h>
#include <cairo.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "kplot.h"
#include "extern.h"
static void
kplotctx_ccfg_init(struct kplotctx *ctx, struct kplotccfg *cfg)
{
switch (cfg->type) {
case (KPLOTCTYPE_PALETTE):
cairo_set_source_rgba(ctx->cr,
ctx->cfg.clrs[cfg->palette % ctx->cfg.clrsz].rgba[0],
ctx->cfg.clrs[cfg->palette % ctx->cfg.clrsz].rgba[1],
ctx->cfg.clrs[cfg->palette % ctx->cfg.clrsz].rgba[2],
ctx->cfg.clrs[cfg->palette % ctx->cfg.clrsz].rgba[3]);
break;
case (KPLOTCTYPE_PATTERN):
cairo_set_source(ctx->cr, cfg->pattern);
break;
case (KPLOTCTYPE_RGBA):
cairo_set_source_rgba(ctx->cr, cfg->rgba[0],
cfg->rgba[1], cfg->rgba[2], cfg->rgba[3]);
break;
default:
abort();
}
}
void
kplotctx_ticln_init(struct kplotctx *ctx, struct kplotticln *line)
{
kplotctx_ccfg_init(ctx, &line->clr);
cairo_set_line_width(ctx->cr, line->sz);
cairo_set_dash(ctx->cr, line->dashes,
line->dashesz, line->dashoff);
}
void
kplotctx_font_init(struct kplotctx *ctx, struct kplotfont *font)
{
kplotctx_ccfg_init(ctx, &font->clr);
cairo_select_font_face
(ctx->cr, font->family,
font->slant,
font->weight);
cairo_set_font_size(ctx->cr, font->sz);
}
void
kplotctx_point_init(struct kplotctx *ctx, struct kplotpoint *pnt)
{
kplotctx_ccfg_init(ctx, &pnt->clr);
cairo_set_line_width(ctx->cr, pnt->sz);
cairo_set_dash(ctx->cr, pnt->dashes,
pnt->dashesz, pnt->dashoff);
}
void
kplotctx_line_init(struct kplotctx *ctx, struct kplotline *line)
{
kplotctx_ccfg_init(ctx, &line->clr);
cairo_set_line_width(ctx->cr, line->sz);
cairo_set_dash(ctx->cr, line->dashes,
line->dashesz, line->dashoff);
cairo_set_line_join(ctx->cr, line->join);
}
/*
* Given a plotting context and a position for drawing a line, determine
* whether we want to "fix" the line so that it's fine.
* This is a foible of Cairo and drawing with doubles.
*/
double
kplotctx_line_fix(const struct kplotctx *ctx, double sz, double pos)
{
double v;
if (0 == (int)sz % 2)
return(pos);
v = pos - floor(pos);
return(v < DBL_EPSILON ? pos + 0.5 : pos - v + 0.5);
}
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