1 files changed, 121 insertions, 0 deletions
diff --git a/cover/matrix.cpp b/cover/matrix.cpp
new file mode 100644
index 0000000..431126e
--- /dev/null
+++ b/cover/matrix.cpp
@@ -0,0 +1,121 @@
+/*
+ * matrix.cpp -- create the cover image
+ *
+ * (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+ */
+#include <ImageMagick-7/Magick++.h>
+#include <getopt.h>
+#include <iostream>
+#include <cstdlib>
+#include <cstdio>
+#include <string>
+
+class MatrixImage : public Magick::Image {
+	Magick::ColorRGB	_schriftfarbe;
+	double	_opacity_fade;
+public:
+	double	opacity_fade() const { return _opacity_fade; }
+	void	opacity_fade(double of) { _opacity_fade = of; }
+	MatrixImage(Magick::Geometry& geometry, Magick::Color& color,
+		Magick::Color& schriftfarbe)
+		: Magick::Image(geometry, color), _schriftfarbe(schriftfarbe) {
+		_opacity_fade = 0.9;
+		strokeColor(schriftfarbe);
+		fillColor(schriftfarbe);
+		font("Courier");
+	}
+	void	verticalline(double x, double scale, double startopacity);
+	void	verticallines(double width, double scale, double startopacity);
+};
+
+void	MatrixImage::verticalline(double x, double scale, double startopacity) {
+	std::vector<Magick::Drawable>	objects_to_draw;
+
+	fontPointsize(20 * scale);
+	double	heightstep = 16 * scale;
+
+	double	r = (random() % 65525) / 65535.;
+	double	initialheight = size().height() * (1 - 0.5 * r);
+	initialheight = heightstep * trunc(initialheight / heightstep);
+	double	opacity = startopacity;
+
+	for (int i = 0; i < 20; i++) {
+		objects_to_draw.push_back(Magick::DrawableStrokeOpacity(opacity));
+		objects_to_draw.push_back(Magick::DrawableFillOpacity(opacity));
+		char	buffer[2];
+		snprintf(buffer, sizeof(buffer), "%d", random() % 10);
+		objects_to_draw.push_back(Magick::DrawableText(x, initialheight - i * heightstep, buffer));
+		opacity *= opacity_fade();
+	}
+	draw(objects_to_draw);
+}
+
+void	MatrixImage::verticallines(double width, double scale, double startopacity) {
+	int	xstep = scale * 12;
+	for (int x = 0; x < width; x += xstep) {
+		verticalline(x, scale, startopacity);
+std::cout << x << std::endl;
+	}
+}
+
+struct option	longoptions[] = {
+{ "foreground",	required_argument,	NULL,	'f' },
+{ "background",	required_argument,	NULL,	'b' },
+{ "opacity",	required_argument,	NULL,	'o' },
+{ "width",	required_argument,	NULL,	'w' },
+{ "height",	required_argument,	NULL,	'h' },
+{ "scale",	required_argument,	NULL,	's' },
+{ NULL,		0,			NULL,	 0  }
+};
+
+int	main(int argc, char *argv[]) {
+	Magick::InitializeMagick(*argv);
+	int	width = 1920;
+	int	height = 1080;
+	double	opacityfade = 0.9;
+	std::string	backgroundcolor("black");
+	std::string	foregroundcolor("#66ffcc");
+	int	c;
+	int	longindex;
+	double	scale = 1;
+	while (EOF != (c = getopt_long(argc, argv, "f:b:o:w:h:s:", longoptions, &longindex)))
+		switch (c) {
+		case 'o':
+			opacityfade = std::stod(optarg);
+			break;
+		case 'w':
+			width = std::stoi(optarg);
+			break;
+		case 'h':
+			height = std::stoi(optarg);
+			break;
+		case 's':
+			scale = std::stod(optarg);
+			break;
+		case 'f':
+			foregroundcolor = std::string(optarg);
+			break;
+		case 'b':
+			backgroundcolor = std::string(optarg);
+			break;
+		}
+
+	if (optind >= argc) {
+		std::cerr << "no filename" << std::endl;
+		return EXIT_FAILURE;
+	}
+	std::string	filename(argv[optind]);
+
+	Magick::Geometry	geometry(width, height);
+	Magick::ColorRGB	background(backgroundcolor);
+	Magick::ColorRGB	schriftfarbe(foregroundcolor);
+
+	MatrixImage	image(geometry, background, schriftfarbe);
+	image.opacity_fade(opacityfade);
+
+	image.verticallines(image.size().width(), 0.5 * scale, 0.25);
+	image.verticallines(image.size().width(), 0.7 * scale, 0.5);
+	image.verticallines(image.size().width(), 1 * scale, 1);
+
+	image.write(filename);
+}