nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <string.h>
nuclear@0: #include <ctype.h>
nuclear@0: #include <math.h>
nuclear@0: #include <assert.h>
nuclear@0: #include <alloca.h>
nuclear@0: 
nuclear@0: #ifndef __APPLE__
nuclear@0: #include <GL/glut.h>
nuclear@0: #else
nuclear@0: #include <GLUT/glut.h>
nuclear@0: #endif
nuclear@0: #include <rbtree.h>
nuclear@0: #include <drawtext.h>
nuclear@0: 
nuclear@0: #define FONTSZ	18
nuclear@0: 
nuclear@0: void init_gl(int argc, char **argv);
nuclear@0: float rbvis_width(struct rbnode *tree);
nuclear@0: void rbvis_draw(struct rbnode *tree, float x, float y);
nuclear@0: 
nuclear@0: void draw_roundbox(float xsz, float ysz, float rad, int segm, const float *col, float border, const float *bcol);
nuclear@0: void draw_fillet(float rad, int segm);
nuclear@0: 
nuclear@0: struct rbtree *tree;
nuclear@0: int num_nodes;
nuclear@0: struct dtx_font *font;
nuclear@0: char input_buffer[64];
nuclear@0: int win_xsz, win_ysz;
nuclear@0: 
nuclear@0: int main(int argc, char **argv)
nuclear@0: {
nuclear@0: 	int i;
nuclear@0: 
nuclear@0: 	if(argv[1]) {
nuclear@0: 		if(!isdigit(argv[1][0])) {
nuclear@0: 			fprintf(stderr, "pass a fucking number, not: %s\n", argv[1]);
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 		num_nodes = atoi(argv[1]);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!(font = dtx_open_font("linux-libertine.ttf", FONTSZ))) {
nuclear@0: 		fprintf(stderr, "failed to open font\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!(tree = rb_create(RB_KEY_INT))) {
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	for(i=0; i<num_nodes; i++) {
nuclear@0: 		rb_inserti(tree, i, 0);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	init_gl(argc, argv);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: #define NWIDTH	28.0
nuclear@0: #define NHEIGHT 24.0
nuclear@0: #define PADDING	0
nuclear@0: #define DY	(NHEIGHT + NHEIGHT / 2.0)
nuclear@0: 
nuclear@0: #define VIS(node)	((struct visinfo*)(node)->data)
nuclear@0: 
nuclear@0: void disp(void);
nuclear@0: void reshape(int x, int y);
nuclear@0: void keyb(unsigned char key, int x, int y);
nuclear@0: void draw_rect(float x, float y, float width, float height, const char *text, int red);
nuclear@0: void draw_link(float x0, float y0, float x1, float y1, int red);
nuclear@0: 
nuclear@0: void init_gl(int argc, char **argv)
nuclear@0: {
nuclear@0: 	glutInitWindowSize(1280, 720);
nuclear@0: 	glutInit(&argc, argv);
nuclear@0: 	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_MULTISAMPLE);
nuclear@0: 
nuclear@0: 	glutCreateWindow("foo");
nuclear@0: 
nuclear@0: 	dtx_use_font(font, FONTSZ);
nuclear@0: 
nuclear@0: 	glutDisplayFunc(disp);
nuclear@0: 	glutReshapeFunc(reshape);
nuclear@0: 	glutKeyboardFunc(keyb);
nuclear@0: 
nuclear@0: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 	glEnable(GL_MULTISAMPLE);
nuclear@0: 
nuclear@0: 	glutMainLoop();
nuclear@0: }
nuclear@0: 
nuclear@0: void disp(void)
nuclear@0: {
nuclear@0: 	struct rbnode *root = rb_root(tree);
nuclear@0: 
nuclear@0: 	glClearColor(0.57, 0.64, 0.59, 1.0);
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glLoadIdentity();
nuclear@0: 
nuclear@0: 	if(input_buffer[0]) {
nuclear@0: 		char *prompt = "select node to delete: ";
nuclear@0: 		char *buf = alloca(strlen(prompt) + strlen(input_buffer));
nuclear@0: 
nuclear@0: 		glPushMatrix();
nuclear@0: 		glTranslatef(10, 10, -0.9);
nuclear@0: 		glColor3f(0, 0, 0);
nuclear@0: 		sprintf(buf, "%s%s", prompt, input_buffer);
nuclear@0: 		dtx_string(buf);
nuclear@0: 		glPopMatrix();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(root) {
nuclear@0: 		rbvis_draw(root, rbvis_width(root->left) + NWIDTH, 550);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glutSwapBuffers();
nuclear@0: 	assert(glGetError() == GL_NO_ERROR);
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: float rbvis_width(struct rbnode *tree)
nuclear@0: {
nuclear@0: 	if(!tree)
nuclear@0: 		return NWIDTH;
nuclear@0: 
nuclear@0: 	return NWIDTH + rbvis_width(tree->left) + rbvis_width(tree->right) + PADDING * 3.0;
nuclear@0: }
nuclear@0: 
nuclear@0: void rbvis_draw(struct rbnode *tree, float x, float y)
nuclear@0: {
nuclear@0: 	float leftx, rightx, nexty;
nuclear@0: 	static const float hxsz = NWIDTH / 2.0;
nuclear@0: 	static const float hysz = NHEIGHT / 2.0;
nuclear@0: 	char text[16];
nuclear@0: 
nuclear@0: 	if(!tree)
nuclear@0: 		return;
nuclear@0: 
nuclear@0: 	leftx = x - (tree->left ? rbvis_width(tree->left->right) + NWIDTH : rbvis_width(tree->left) / 2.0);
nuclear@0: 	rightx = x + (tree->right ? rbvis_width(tree->right->left) + NWIDTH : rbvis_width(tree->right) / 2.0);
nuclear@0: 
nuclear@0: 	nexty = y - DY;
nuclear@0: 
nuclear@0: 	sprintf(text, "%d", rb_node_keyi(tree));
nuclear@0: 	draw_rect(x - hxsz, y - hysz, NWIDTH, NHEIGHT, text, tree->red);
nuclear@0: 
nuclear@0: 	rbvis_draw(tree->left, leftx, nexty);
nuclear@0: 	rbvis_draw(tree->right, rightx, nexty);
nuclear@0: 
nuclear@0: 	if(tree->left)
nuclear@0: 		draw_link(x, y, leftx, nexty, tree->left->red);
nuclear@0: 	if(tree->right)
nuclear@0: 		draw_link(x, y, rightx, nexty, tree->right->red);
nuclear@0: }
nuclear@0: 
nuclear@0: void draw_rect(float x, float y, float width, float height, const char *text, int red)
nuclear@0: {
nuclear@0: 	float node_col[] = {0.63, 0.71, 0.82, 1.0};
nuclear@0: 	float bord_col[] = {0, 0, 0, 1};
nuclear@0: 
nuclear@0: 	if(red) {
nuclear@0: 		bord_col[0] = 1.0;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glPushMatrix();
nuclear@0: 	glTranslatef(x + width / 2.0, y + height / 2.0, 0.0);
nuclear@0: 
nuclear@0: 	draw_roundbox(width, height, 8, 6, node_col, 1.2, bord_col);
nuclear@0: 
nuclear@0: 	glColor3f(0.15, 0.15, 0.15);
nuclear@0: 	glTranslatef(-dtx_string_width(text) / 2.0, -dtx_string_height(text) / 2.0, 0.1);
nuclear@0: 	dtx_string(text);
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glPopMatrix();
nuclear@0: }
nuclear@0: 
nuclear@0: void draw_link(float x0, float y0, float x1, float y1, int red)
nuclear@0: {
nuclear@0: 	glPushAttrib(GL_LINE_BIT);
nuclear@0: 	if(red) {
nuclear@0: 		glLineWidth(3);
nuclear@0: 	} else {
nuclear@0: 		glLineWidth(2);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	glBegin(GL_LINES);
nuclear@0: 	if(red) {
nuclear@0: 		glColor3f(0.8, 0.36, 0.3);
nuclear@0: 	} else {
nuclear@0: 		glColor3f(0, 0, 0);
nuclear@0: 	}
nuclear@0: 	glVertex3f(x0, y0, -0.8);
nuclear@0: 	glVertex3f(x1, y1, -0.8);
nuclear@0: 	glEnd();
nuclear@0: 
nuclear@0: 	glPopAttrib();
nuclear@0: }
nuclear@0: 
nuclear@0: void draw_roundbox(float xsz, float ysz, float rad, int segm, const float *col, float border, const float *bcol)
nuclear@0: {
nuclear@0: 	float hin_xsz, hin_ysz;
nuclear@0: 
nuclear@0: 	if(border > 0.0f) {
nuclear@0: 		glPushMatrix();
nuclear@0: 		glTranslatef(0, 0, -0.001);
nuclear@0: 		draw_roundbox(xsz + 2 * border, ysz + 2 * border, rad + border, segm, bcol, 0.0, bcol);
nuclear@0: 		glPopMatrix();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	/* half inner size */
nuclear@0: 	hin_xsz = (xsz - 2.0 * rad) / 2.0;
nuclear@0: 	hin_ysz = (ysz - 2.0 * rad) / 2.0;
nuclear@0: 
nuclear@0: 	glColor4fv(col);
nuclear@0: 
nuclear@0: 	glBegin(GL_QUADS);
nuclear@0: 	/* center */
nuclear@0: 	glVertex2f(-hin_xsz, -hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz, -hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz, hin_ysz);
nuclear@0: 	glVertex2f(-hin_xsz, hin_ysz);
nuclear@0: 	/* right */
nuclear@0: 	glVertex2f(hin_xsz, -hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz + rad, -hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz + rad, hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz, hin_ysz);
nuclear@0: 	/* top */
nuclear@0: 	glVertex2f(-hin_xsz, hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz, hin_ysz);
nuclear@0: 	glVertex2f(hin_xsz, hin_ysz + rad);
nuclear@0: 	glVertex2f(-hin_xsz, hin_ysz + rad);
nuclear@0: 	/* left */
nuclear@0: 	glVertex2f(-hin_xsz - rad, -hin_ysz);
nuclear@0: 	glVertex2f(-hin_xsz, -hin_ysz);
nuclear@0: 	glVertex2f(-hin_xsz, hin_ysz);
nuclear@0: 	glVertex2f(-hin_xsz - rad, hin_ysz);
nuclear@0: 	/* bottom */
nuclear@0: 	glVertex2f(-hin_xsz, -hin_ysz - rad);
nuclear@0: 	glVertex2f(hin_xsz, -hin_ysz - rad);
nuclear@0: 	glVertex2f(hin_xsz, -hin_ysz);
nuclear@0: 	glVertex2f(-hin_xsz, -hin_ysz);
nuclear@0: 	glEnd();
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 
nuclear@0: 	glPushMatrix();
nuclear@0: 	glTranslatef(hin_xsz, hin_ysz, 0);
nuclear@0: 	draw_fillet(rad, segm);
nuclear@0: 	glPopMatrix();
nuclear@0: 
nuclear@0: 	glPushMatrix();
nuclear@0: 	glTranslatef(-hin_xsz, hin_ysz, 0);
nuclear@0: 	glRotatef(90, 0, 0, 1);
nuclear@0: 	draw_fillet(rad, segm);
nuclear@0: 	glPopMatrix();
nuclear@0: 
nuclear@0: 	glPushMatrix();
nuclear@0: 	glTranslatef(-hin_xsz, -hin_ysz, 0);
nuclear@0: 	glRotatef(180, 0, 0, 1);
nuclear@0: 	draw_fillet(rad, segm);
nuclear@0: 	glPopMatrix();
nuclear@0: 
nuclear@0: 	glPushMatrix();
nuclear@0: 	glTranslatef(hin_xsz, -hin_ysz, 0);
nuclear@0: 	glRotatef(270, 0, 0, 1);
nuclear@0: 	draw_fillet(rad, segm);
nuclear@0: 	glPopMatrix();
nuclear@0: }
nuclear@0: 
nuclear@0: void draw_fillet(float rad, int segm)
nuclear@0: {
nuclear@0: 	int i;
nuclear@0: 
nuclear@0: 	glBegin(GL_TRIANGLE_FAN);
nuclear@0: 	glVertex2f(0, 0);
nuclear@0: 	for(i=0; i<segm; i++) {
nuclear@0: 		float theta = 0.5 * M_PI * (float)i / (float)(segm - 1);
nuclear@0: 		float x = cos(theta) * rad;
nuclear@0: 		float y = sin(theta) * rad;
nuclear@0: 		glVertex2f(x, y);
nuclear@0: 	}
nuclear@0: 	glEnd();
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void reshape(int x, int y)
nuclear@0: {
nuclear@0: 	win_xsz = x;
nuclear@0: 	win_ysz = y;
nuclear@0: 
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glOrtho(0, x, 0, y, -1, 1);
nuclear@0: }
nuclear@0: 
nuclear@0: void keyb(unsigned char key, int x, int y)
nuclear@0: {
nuclear@0: 	static int wposx = -1, wposy;
nuclear@0: 	static char *inp_next;
nuclear@0: 
nuclear@0: 	switch(key) {
nuclear@0: 	case 27:
nuclear@0: 		exit(0);
nuclear@0: 
nuclear@0: 	case 'f':
nuclear@0: 	case 'F':
nuclear@0: 		if(wposx >= 0) {
nuclear@0: 			glutPositionWindow(wposx, wposy);
nuclear@0: 			wposx = -1;
nuclear@0: 		} else {
nuclear@0: 			wposx = glutGet(GLUT_WINDOW_X);
nuclear@0: 			wposy = glutGet(GLUT_WINDOW_Y);
nuclear@0: 			glutFullScreen();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'a':
nuclear@0: 		rb_inserti(tree, num_nodes++, 0);
nuclear@0: 		glutPostRedisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'r':
nuclear@0: 		{
nuclear@0: 			int x;
nuclear@0: 			do {
nuclear@0: 				x = rand() % 1024;
nuclear@0: 			} while(rb_findi(tree, x));
nuclear@0: 
nuclear@0: 			rb_inserti(tree, x, 0);
nuclear@0: 		}
nuclear@0: 		glutPostRedisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 'd':
nuclear@0: 		inp_next = input_buffer;
nuclear@0: 		*inp_next++ = ' ';
nuclear@0: 		*inp_next = 0;
nuclear@0: 		glutPostRedisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case '0':
nuclear@0: 	case '1':
nuclear@0: 	case '2':
nuclear@0: 	case '3':
nuclear@0: 	case '4':
nuclear@0: 	case '5':
nuclear@0: 	case '6':
nuclear@0: 	case '7':
nuclear@0: 	case '8':
nuclear@0: 	case '9':
nuclear@0: 		if(inp_next) {
nuclear@0: 			*inp_next++ = key;
nuclear@0: 			*inp_next = 0;
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case '\b':
nuclear@0: 		if(inp_next > input_buffer) {
nuclear@0: 			*--inp_next = 0;
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case '\n':
nuclear@0: 	case '\r':
nuclear@0: 		if(inp_next) {
nuclear@0: 			int x;
nuclear@0: 			char *endp;
nuclear@0: 
nuclear@0: 			*inp_next = 0;
nuclear@0: 			inp_next = 0;
nuclear@0: 
nuclear@0: 			if((x = strtol(input_buffer, &endp, 10)), endp == input_buffer) {
nuclear@0: 				fprintf(stderr, "invalid input: %s\n", input_buffer);
nuclear@0: 			} else if(!rb_findi(tree, x)) {
nuclear@0: 				fprintf(stderr, "%d not found in the tree\n", x);
nuclear@0: 			} else {
nuclear@0: 				printf("deleting: %d\n", x);
nuclear@0: 				rb_deletei(tree, x);
nuclear@0: 			}
nuclear@0: 			input_buffer[0] = 0;
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: