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/* $Id: grid.c,v 1.3 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 <stdio.h>
#include <stdlib.h>
#include "kplot.h"
#include "extern.h"
void
kplotctx_grid_init(struct kplotctx *ctx)
{
double offs, v;
size_t i;
kplotctx_line_init(ctx, &ctx->cfg.gridline);
if (GRID_X & ctx->cfg.grid)
for (i = 0; i < ctx->cfg.xtics; i++) {
offs = 1 == ctx->cfg.xtics ? 0.5 :
i / (double)(ctx->cfg.xtics - 1);
v = kplotctx_line_fix(ctx,
ctx->cfg.gridline.sz,
ctx->offs.x + offs * ctx->dims.x);
cairo_move_to(ctx->cr, v, ctx->offs.y);
cairo_rel_line_to(ctx->cr, 0.0, ctx->dims.y);
}
if (GRID_Y & ctx->cfg.grid)
for (i = 0; i < ctx->cfg.ytics; i++) {
offs = 1 == ctx->cfg.ytics ? 0.5 :
i / (double)(ctx->cfg.ytics - 1);
v = kplotctx_line_fix(ctx,
ctx->cfg.gridline.sz,
ctx->offs.y + offs * ctx->dims.y);
cairo_move_to(ctx->cr, ctx->offs.x, v);
cairo_rel_line_to(ctx->cr, ctx->dims.x, 0.0);
}
cairo_stroke(ctx->cr);
}
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