From fc0cfd2c7c9f5efddddb21fc94a15cc42685ca1d Mon Sep 17 00:00:00 2001
From: John Tsiombikas <jtsiomb@census.gr>
Date: Tue, 27 Aug 2019 17:14:29 +0300
Subject: [PATCH] initial commit

---
 .gitignore |    4 ++
 Makefile   |   23 ++++++++++++
 src/logo.h |  106 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.c |  120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 253 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 src/logo.h
 create mode 100644 src/main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d90c263
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.o
+*.d
+*.swp
+censuslogo
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a1dc85b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,23 @@
+src = $(wildcard src/*.c)
+obj = $(src:.c=.o)
+dep = $(obj:.o=.d)
+bin = censuslogo
+
+CFLAGS = -pedantic -Wall -g
+LDFLAGS = -lGL -lGLU -lglut -lm
+
+$(bin): $(obj)
+	$(CC) -o $@ $(obj) $(LDFLAGS)
+
+-include $(dep)
+
+%.d: %.c
+	@$(CPP) $(CFLAGS) $< -MM -MT $(@:.d=.o) >$@
+
+.PHONY: clean
+clean:
+	rm -f $(obj) $(bin)
+
+.PHONY: cleandep
+cleandep:
+	rm -f $(dep)
diff --git a/src/logo.h b/src/logo.h
new file mode 100644
index 0000000..c483f0c
--- /dev/null
+++ b/src/logo.h
@@ -0,0 +1,106 @@
+#ifndef LOGO_H_
+#define LOGO_H_
+
+#define LOGO_W	90
+#define LOGO_H	85
+
+static const float logocp[][2] = {
+	{85, 48},
+	{68.5, 64.5},
+	{68.5, 64.5},
+	{52, 81},
+
+	{52, 81},
+	{43, 89},
+	{43, 89},
+	{34, 81},
+
+	{34, 81},
+	{18.5, 66},
+	{18.5, 66},
+	{3, 51},
+
+	{3, 51},
+	{-5, 41.5},
+	{-5, 41.5},
+	{4, 32},
+
+	{4, 32},
+	{19, 17},
+	{19, 17},
+	{33, 3},
+
+	{33, 3},
+	{42, -5},
+	{42, -5},
+	{52, 3},
+
+	{52, 3},
+	{68, 19},
+	{68, 19},
+	{85, 35},
+
+	{85, 35},
+	{75, 35},
+	{85, 35},
+	{75, 35},
+
+	{75, 35},
+	{62, 22},
+	{62, 22},
+	{49, 10},
+
+	{49, 10},
+	{42, 4},
+	{42, 4},
+	{36, 10},
+
+	{36, 10},
+	{23, 22},
+	{23, 22},
+	{11, 35},
+
+	{11, 35},
+	{5, 42},
+	{5, 42},
+	{11, 49},
+
+	{11, 49},
+	{23, 61},
+	{23, 61},
+	{36, 74},
+
+	{36, 74},
+	{42, 79},
+	{42, 79},
+	{49, 74},
+
+	{49, 74},
+	{62, 61},
+	{62, 61},
+	{75, 48},
+
+	{75, 48},
+	{65, 48},
+	{75, 48},
+	{65, 48},
+
+	{65, 48},
+	{55.5, 57.5},
+	{55.5, 57.5},
+	{46, 67},
+
+	{46, 67},
+	{42.5, 70},
+	{42.5, 70},
+	{39, 67},
+
+	{39, 67},
+	{28, 56},
+	{28, 56},
+	{17, 45},
+};
+
+#define LOGOCP_SIZE	(sizeof logocp / sizeof *logocp)
+
+#endif	/* LOGO_H_ */
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..06477c1
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <GL/glut.h>
+#include "logo.h"
+
+#define BEZ_SEG	16
+
+int init(void);
+void display(void);
+void reshape(int x, int y);
+void keyb(unsigned char key, int x, int y);
+
+void draw_bezier(float *cp, int sub);
+
+int main(int argc, char **argv)
+{
+	glutInit(&argc, argv);
+	glutInitWindowSize(800, 600);
+	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+	glutCreateWindow("census");
+
+	glutDisplayFunc(display);
+	glutReshapeFunc(reshape);
+	glutKeyboardFunc(keyb);
+
+	if(init() == -1) {
+		return 1;
+	}
+
+	glutMainLoop();
+	return 0;
+}
+
+int init(void)
+{
+	glEnable(GL_LINE_SMOOTH);
+	return 0;
+}
+
+void display(void)
+{
+	int i, nseg;
+
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glLineWidth(2.0);
+
+	glColor3f(1, 1, 1);
+	nseg = LOGOCP_SIZE / 4;
+	for(i=0; i<nseg; i++) {
+		draw_bezier((float*)(logocp + i * 4), BEZ_SEG);
+	}
+
+	glDisable(GL_BLEND);
+
+	glutSwapBuffers();
+	assert(glGetError() == GL_NO_ERROR);
+}
+
+void reshape(int x, int y)
+{
+	float aspect = (float)x / (float)y;
+
+	glViewport(0, 0, x, y);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glScalef(1.0f / aspect, 1.0f, 1.0f);
+}
+
+void keyb(unsigned char key, int x, int y)
+{
+	switch(key) {
+	case 27:
+		exit(0);
+	}
+}
+
+#define LERP(a, b, t)	((a) + ((b) - (a)) * (t))
+
+void draw_bezier(float *cp, int sub)
+{
+	int i;
+	float cx[4], cy[4], mx[3], my[3], mmx[2], mmy[2], x, y;
+
+	if(sub < 1) sub = 1;
+
+	for(i=0; i<4; i++) {
+		cx[i] = cp[i * 2] / LOGO_W - 0.5f;
+		cy[i] = 0.5f - cp[i * 2 + 1] / LOGO_H;
+	}
+
+	glBegin(GL_LINE_STRIP);
+	for(i=0; i<BEZ_SEG; i++) {
+		float t = (float)i / (float)(BEZ_SEG - 1);
+
+		mx[0] = LERP(cx[0], cx[1], t);
+		my[0] = LERP(cy[0], cy[1], t);
+
+		mx[1] = LERP(cx[1], cx[2], t);
+		my[1] = LERP(cy[1], cy[2], t);
+
+		mx[2] = LERP(cx[2], cx[3], t);
+		my[2] = LERP(cy[2], cy[3], t);
+
+		mmx[0] = LERP(mx[0], mx[1], t);
+		mmy[0] = LERP(my[0], my[1], t);
+
+		mmx[1] = LERP(mx[1], mx[2], t);
+		mmy[1] = LERP(my[1], my[2], t);
+
+		x = LERP(mmx[0], mmx[1], t);
+		y = LERP(mmy[0], mmy[1], t);
+
+		glVertex2f(x, y);
+	}
+	glEnd();
+}
-- 
1.7.10.4