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83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
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/*
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* Copyright 2009 Andrea Canciani
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Andrea Canciani <ranma42@gmail.com>
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*/
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#include "cairo-test.h"
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/* Lengths of the dashes of the dash patterns */
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static const double dashes[] = { 2, 2, 4, 4 };
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/* Dash offset in userspace units
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* They always grow by 2, so the dash pattern is
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* should be shifted by the same amount each time */
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static const double frac_offset[] = { 0, 2, 4, 6 };
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/* Dash offset relative to the whole dash pattern
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* This corresponds to the non-inverted part only if
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* the dash pattern has odd length, so the expected result
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* is the same for every int_offset if the pattern has
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* even length, and inverted each time (or shifted by half
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* period, which is the same) if the pattern has odd length. */
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static const double int_offset[] = { -2, -1, 0, 1, 2 };
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#define PAD 6
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#define STROKE_LENGTH 32
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#define IMAGE_WIDTH (PAD + (STROKE_LENGTH + PAD) * ARRAY_LENGTH (dashes))
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#define IMAGE_HEIGHT (PAD + PAD * ARRAY_LENGTH (int_offset) + PAD * ARRAY_LENGTH (frac_offset) * ARRAY_LENGTH (int_offset))
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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double total;
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size_t i, j, k;
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_set_line_width (cr, 2);
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total = 0.0;
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for (k = 0; k < ARRAY_LENGTH (dashes); ++k) {
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total += dashes[k];
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for (i = 0; i < ARRAY_LENGTH (frac_offset); ++i) {
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for (j = 0; j < ARRAY_LENGTH (int_offset); ++j) {
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cairo_set_dash (cr, dashes, k + 1, frac_offset[i] + total * int_offset[j]);
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cairo_move_to (cr, (STROKE_LENGTH + PAD) * k + PAD, PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));
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cairo_line_to (cr, (STROKE_LENGTH + PAD) * (k + 1), PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));
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cairo_stroke (cr);
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}
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}
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}
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (dash_offset,
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"Tests dashes of different length with various offsets",
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"stroke, dash", /* keywords */
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NULL, /* requirements */
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IMAGE_WIDTH, IMAGE_HEIGHT,
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NULL, draw)
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