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/*
* Copyright 2008-2013 Steven Dalton
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file glut_2d_canvas.cc
* Implement a simple 2d canvas using glut.
*/
#pragma once
#include <cusp/opengl/spy/glut_2d_canvas.h>
#include <cusp/opengl/spy/gl_util.h>
namespace cusp
{
namespace opengl
{
namespace spy
{
/**
* Simple constructor that just takes a width, height, and title.
*
* @param w the width of the window
* @param h the height of the window
* @param title the window title
*/
glut_2d_canvas::glut_2d_canvas(int w, int h, const char* title)
: mouse_state(STATE_NONE),
center_x(0.0f), center_y(0.0f),
trans_x(0.0f), trans_y(0.0f),
width(w), height(h),
natural_width((float)w), natural_height((float)h),
virtual_width((float)w), virtual_height((float)h),
zoom(1.0f),
mouse_begin_x(0), mouse_begin_y(0),
aspect(1.0f),
display_finished(true),
frame(0)
{
set_background_color(0.0f,0.0f,0.0f);
glutInitWindowSize(w,h);
glut_id = glutCreateWindow(title);
register_with_glut();
}
void glut_2d_canvas::draw()
{
}
void glut_2d_canvas::display()
{
if (display_finished) {
frame = 0;
glClearColor(background_color[0],background_color[1],background_color[2],0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
} else {
frame++;
}
display_finished = true;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(center_x, center_y, 0);
glScalef(zoom,zoom,1);
glTranslatef(-center_x, -center_y, 0);
glTranslatef(trans_x, trans_y,0);
draw();
glutSwapBuffers();
if (!display_finished) {
glutPostRedisplay();
}
}
void glut_2d_canvas::reshape(int w, int h)
{
width = w;
height = h;
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float scale1 = (float)h/natural_height;
float scale2 = (float)w/natural_width;
float scalew, scaleh;
if (scale1 <= scale2){
scalew = scale2/scale1;
//scaleh = 1;
scaleh = aspect;
} else {
//scalew = 1;
scalew = 1/aspect;
scaleh = scale1/scale2;
}
float x1 = center_x - natural_width*scalew/2;
float x2 = center_x + natural_width*scalew/2;
float y1 = center_y - natural_height*scaleh/2;
float y2 = center_y + natural_height*scaleh/2;
glOrtho(x1, x2, y2, y1, -1.0, 1.0);
virtual_width = natural_width*scalew;
virtual_height = natural_height*scaleh;
}
void glut_2d_canvas::key(unsigned char key, int x, int y)
{
}
void glut_2d_canvas::special_key(int key, int x, int y)
{
}
void glut_2d_canvas::motion(int x, int y)
{
switch (mouse_state)
{
case STATE_MOVE:
trans_x += (x - mouse_begin_x)*virtual_width/(float)width/zoom;
trans_y += (y - mouse_begin_y)*virtual_height/(float)height/zoom;
mouse_begin_x = x;
mouse_begin_y = y;
break;
case STATE_ZOOM:
// normal zoom
if(mouse_begin_y > y)
zoom *= 1.0f/.95f;
if(mouse_begin_y < y)
zoom *= 0.95f;
mouse_begin_y = y;
break;
default :
break;
}
glutPostRedisplay();
}
void glut_2d_canvas::mouse_click(int button, int state, int x, int y)
{
int mod_state = glutGetModifiers();
switch (state) {
case GLUT_UP:
mouse_state = STATE_NONE;
/*switch (button) {
case GLUT_WHEEL_DOWN:
zoom *= 0.75f;
break;
case GLUT_WHEEL_UP:
zoom *= 1.0f/0.75f;
break;
}*/
break;
case GLUT_DOWN:
if (button == GLUT_LEFT_BUTTON && mod_state == GLUT_ACTIVE_SHIFT)
{
mouse_state = STATE_ZOOM;
}
else if (button == GLUT_LEFT_BUTTON)
{
mouse_state = STATE_MOVE;
}
break;
}
begin_mouse_click(x,y);
glutPostRedisplay();
}
} // end spy
} // end opengl
} // end cusp
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