vectorix/exporter_ps.cpp at master · hadrava/vectorix · GitHub

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/*
 * Vectorix -- line-based image vectorizer
 * (c) 2016 Jan Hadrava <had@atrey.karlin.mff.cuni.cz>
 */
#include <cstdio>
#include <locale>
#include "v_image.h"
#include "exporter_ps.h"

// Post Script exporter

namespace vectorix {

void exporter_ps::write_header() {
	fprintf(fd, "%%!PS-Adobe-3.0 EPSF-3.0\n");
	int w = image->width;
	int h = image->height;
	fprintf(fd, "%%%%BoundingBox: 0 0 %d %d\n", w, h);
	fprintf(fd, "gsave\n"); // Save current drawing state (needed by EPS)
};

void exporter_ps::write_footer() {
	fprintf(fd, "grestore\n"); // Restore drawing state
	fprintf(fd, "%%EOF\n");
};

void exporter_ps::write_line(const v_line &line) {
	auto segment = line.segment.cbegin();
	auto h = image->height;
	fprintf(fd, "%f %f moveto\n", segment->main.x, h - segment->main.y); // y coordinate has to be transformed

	v_pt cn = segment->control_next;
	int count = 1;
	p width = segment->width;
	p opacity = segment->opacity;
	v_co color = segment->color;
	segment++;
	while (segment != line.segment.cend()) {
		fprintf(fd, "%f %f %f %f %f %f curveto\n", cn.x, h - cn.y, segment->control_prev.x, h - segment->control_prev.y, segment->main.x, h - segment->main.y); // draw bezier curve
		cn = segment->control_next;
		count ++;
		// average width, opacity and color
		width += segment->width;
		opacity += segment->opacity;
		color += segment->color;
		segment++;
	}
	color /= count;
	if (line.get_type() == v_line_type::stroke) {
		fprintf(fd, "1 setlinecap\n"); // line end is round
		fprintf(fd, "1 setlinejoin\n"); // line join is round
		fprintf(fd, "%f setlinewidth\n", width/count); // average width
		fprintf(fd, "%f %f %f setrgbcolor stroke\n", color.val[0]/255.f, color.val[1]/255.f, color.val[2]/255.f); // average color
	}
	else {
		if ((line.get_group() == v_line_group::group_normal) || (line.get_group() == v_line_group::group_first)) {
			group_col = color; //save color of first area in a group
		}
		if ((line.get_group() == v_line_group::group_normal) || (line.get_group() == v_line_group::group_last)) {
			fprintf(fd, "%f %f %f setrgbcolor fill\n", group_col.val[0]/255.f, group_col.val[1]/255.f, group_col.val[2]/255.f); // fill with color
		}
	}
};

}; // namespace