nuclear@0: #include <stdio.h>
nuclear@0: #include <assert.h>
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 "imtk.h"
nuclear@0: 
nuclear@0: static int scr_width = 1, scr_height = 1;
nuclear@0: static int mousex, mousey, mouse_bnmask;
nuclear@0: static int active = -1, hot = -1;
nuclear@0: 
nuclear@0: static void set_active(int id);
nuclear@0: static int set_hot(int id);
nuclear@0: static int hit_test(int x, int y, int w, int h);
nuclear@0: 
nuclear@0: static void draw_button(int id, int x, int y, const char *label, int focused);
nuclear@0: static void calc_button_size(const char *label, int *wret, int *hret);
nuclear@0: static void draw_string(int x, int y, const char *str);
nuclear@0: static int string_size(const char *str);
nuclear@0: 
nuclear@0: void imtk_inp_key(int key, int state)
nuclear@0: {
nuclear@0: 	glutPostRedisplay();
nuclear@0: }
nuclear@0: 
nuclear@0: void imtk_inp_mouse(int bn, int state)
nuclear@0: {
nuclear@0: 	if(state == IMTK_DOWN) {
nuclear@0: 		mouse_bnmask |= 1 << bn;
nuclear@0: 	} else {
nuclear@0: 		mouse_bnmask &= ~(1 << bn);
nuclear@0: 	}
nuclear@0: 	glutPostRedisplay();
nuclear@0: }
nuclear@0: 
nuclear@0: void imtk_inp_motion(int x, int y)
nuclear@0: {
nuclear@0: 	mousex = x;
nuclear@0: 	mousey = y;
nuclear@0: 
nuclear@0: 	glutPostRedisplay();
nuclear@0: }
nuclear@0: 
nuclear@0: void imtk_inp_reshape(int x, int y)
nuclear@0: {
nuclear@0: 	scr_width = x;
nuclear@0: 	scr_height = y;
nuclear@0: }
nuclear@0: 
nuclear@0: void imtk_begin(void)
nuclear@0: {
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glPushMatrix();
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glTranslatef(-1, 1, 0);
nuclear@0: 	glScalef(2.0 / scr_width, -2.0 / scr_height, 1.0);
nuclear@0: }
nuclear@0: 
nuclear@0: void imtk_end(void)
nuclear@0: {
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glPopMatrix();
nuclear@0: }
nuclear@0: 
nuclear@0: int imtk_button(int id, const char *label, int x, int y)
nuclear@0: {
nuclear@0: 	int w, h, res = 0;
nuclear@0: 	int over = 0;
nuclear@0: 
nuclear@0: 	assert(id >= 0);
nuclear@0: 
nuclear@0: 	calc_button_size(label, &w, &h);
nuclear@0: 
nuclear@0: 	if(hit_test(x, y, w, h)) {
nuclear@0: 		if(set_hot(id)) {
nuclear@0: 			glutPostRedisplay();
nuclear@0: 		}
nuclear@0: 		over = 1;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 
nuclear@0: 	if(mouse_bnmask & (1 << IMTK_LEFT_BUTTON)) {
nuclear@0: 		if(over) {
nuclear@0: 			set_active(id);
nuclear@0: 		}
nuclear@0: 	} else { /* mouse button up */
nuclear@0: 		if(active == id) {
nuclear@0: 			set_active(-1);
nuclear@0: 			if(hot == id && over) {
nuclear@0: 				res = 1;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	draw_button(id, x, y, label, over);
nuclear@0: 	return res;
nuclear@0: }
nuclear@0: 
nuclear@0: static void set_active(int id)
nuclear@0: {
nuclear@0: 	active = id;
nuclear@0: }
nuclear@0: 
nuclear@0: static int set_hot(int id)
nuclear@0: {
nuclear@0: 	if(active == -1) {
nuclear@0: 		hot = id;
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: static int hit_test(int x, int y, int w, int h)
nuclear@0: {
nuclear@0: 	return mousex >= x && mousex < (x + w) &&
nuclear@0: 		mousey >= y && mousey < (y + h);
nuclear@0: }
nuclear@0: 
nuclear@0: static void draw_button(int id, int x, int y, const char *label, int focused)
nuclear@0: {
nuclear@0: 	int width, height;
nuclear@0: 
nuclear@0: 	calc_button_size(label, &width, &height);
nuclear@0: 
nuclear@0: 	glBegin(GL_QUADS);
nuclear@0: 	if(focused) {
nuclear@0: 		glColor3f(0.85, 0.85, 0.85);
nuclear@0: 	} else {
nuclear@0: 		glColor3f(0.7, 0.7, 0.7);
nuclear@0: 	}
nuclear@0: 	glVertex2f(x, y);
nuclear@0: 	glVertex2f(x + width, y);
nuclear@0: 	glVertex2f(x + width, y + height);
nuclear@0: 	glVertex2f(x, y + height);
nuclear@0: 	glEnd();
nuclear@0: 
nuclear@0: 	glColor3f(0, 0, 0);
nuclear@0: 	draw_string(x + 20, y + 15, label);
nuclear@0: }
nuclear@0: 
nuclear@0: static void calc_button_size(const char *label, int *wret, int *hret)
nuclear@0: {
nuclear@0: 	int strsz = string_size(label);
nuclear@0: 	if(wret) *wret = strsz + 40;
nuclear@0: 	if(hret) *hret = 20;
nuclear@0: }
nuclear@0: 
nuclear@0: static void draw_string(int x, int y, const char *str)
nuclear@0: {
nuclear@0: 	glRasterPos2i(x, y);
nuclear@0: 	while(*str) {
nuclear@0: 		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, *str++);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static int string_size(const char *str)
nuclear@0: {
nuclear@0: 	return glutBitmapLength(GLUT_BITMAP_HELVETICA_10, str);
nuclear@0: }