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pyGTK - Events & Basic 3d

Below is the code for a little exercise in basic pyGTK event-handling and basic 3-d, overhauling some code I wrote yonks ago in Borland Turbo Pascal.

dependencies: pyGTK

--- --- rot.py --- --- --- --- --- --- --- --- --- ---

import math

class Point2D(object):
    def __init__(self, x=None,y=None):
        self.x = x
        self.y = y

class Point3D(object):
    def __init__(self, x=None,y=None,z=None):
        self.x = x
        self.y = y
        self.z = z        

class Rot(object):
    
    rad_const = math.pi / 180.0  
    
    def rad(self, theta):
        return theta * Rot.rad_const    
        
    def __init__(self):
        
        self.sin_table = []
        self.cos_table = []
        
        for d in range(360):
            self.sin_table.append(math.sin(self.rad(d)))
            self.cos_table.append(math.cos(self.rad(d)))
        
        for i in [1]: # points            
            self.points = []        
            for i in range(24):
                self.points.append(Point3D())

            self.points[0].x =  10.0 
            self.points[0].z =   4.0
            self.points[1].x =   4.0
            self.points[1].z =  10.0
            self.points[2].x =  -4.0 
            self.points[2].z =  10.0
            self.points[3].x = -10.0 
            self.points[3].z =   4.0
            self.points[4].x = -10.0 
            self.points[4].z =  -4.0
            self.points[5].x =  -4.0 
            self.points[5].z = -10.0
            self.points[6].x =   4.0 
            self.points[6].z = -10.0
            self.points[7].x =  10.0 
            self.points[7].z =  -4.0

            for i in range(8):
                self.points[i].y = 30.0

            for i in range(8, 16):
                self.points[i].x = self.points[i - 8].x
                self.points[i].z = self.points[i - 8].z
                self.points[i].y = -30.0

            self.points[16].x =  20.0
            self.points[16].z =  20.0
            self.points[17].x = -20.0
            self.points[17].z =  20.0
            self.points[18].x = -20.0
            self.points[18].z = -20.0
            self.points[19].x =  20.0
            self.points[19].z = -20.0

            for i in range(16, 20):
                self.points[i].y = 30.0

            for i in range(20, 24):
                self.points[i].x = self.points[i - 4].x
                self.points[i].z = self.points[i - 4].z
                self.points[i].y = -30.0        
            
        
        self.x_off = 320.0
        self.y_off = 240.0
        self.z_off = 50.0

        self.z_deg = 0
        self.x_deg = 0
        self.y_deg = 0
            
    def flatten(self, cube):
        '''
        320 : 200 => 1 : 5 / 8 |  a.r of 4 : 3, height = 4 / 3 of width, therefore
        x : y => 1 : 5 / 6
        '''
        
        n = len(self.points)
        
        x_scale = 100.0
        y_scale = 100.0 # 83.0
        
        flat = []        
        for i in range(n):
            x = cube[i].x
            y = cube[i].y
            z = self.z_off - cube[i].z
            nx = int(self.x_off + (x / z * x_scale))
            ny = int(self.y_off + (y / z * y_scale))
            flat.append(Point2D(nx, ny))
            
        return flat


    def rotate(self, points, z, x, y):
        '''
        to rotate a point (oX, oY) through Alpha radians, counter-clockwise, about
        the z axis:
        nX = [Cos(Alpha) * oX] - [Sin(Alpha) * oY]
        nY = [Sin(Alpha) * oX] + [Cos(Alpha) * oY]
        '''
        
        rotated = []
        for i in range(len(points)):
            oX = points[i].x
            oY = points[i].y
            oZ = points[i].z

            # about z axis 
            nX = (self.cos_table[z] * oX) - (self.sin_table[z] * oY)
            nY = (self.sin_table[z] * oX) + (self.cos_table[z] * oY)
            oX = nX 
            oY = nY

            # about x axis 
            nZ = (self.cos_table[x] * oZ) - (self.sin_table[x] * oY)
            nY = (self.sin_table[x] * oZ) + (self.cos_table[x] * oY)
            oZ = nZ

            # about y axis 
            nX = (self.cos_table[y] * oX) - (self.sin_table[y] * oZ)
            nZ = (self.sin_table[y] * oX) + (self.cos_table[y] * oZ)

            rotated.append(Point3D(x=nX, y=nY, z=nZ))
            
        return rotated

    def draw_to_pixmap(self, points, pixmap, gc, style):
        '''
        '''
        # pixmap.draw_line(self.gc, x, y, self.w/2, self.h/2)  

        #  octal inlay flush with end plate 
        for i in range(7):
            pixmap.draw_line(gc, points[i].x, points[i].y, points[i + 1].x, points[i + 1].y)
        
        pixmap.draw_line(gc, points[7].x, points[7].y, points[0].x, points[0].y)

        # connections between octal inlays'pipe' 
        for i in range(8):
            pixmap.draw_line(gc, points[i].x, points[i].y, points[i + 8].x, points[i + 8].y)

        #  octal inlay flush with end plate 
        for i in range(8, 15):
            pixmap.draw_line(gc, points[i].x, points[i].y, points[i + 1].x, points[i + 1].y)
        
        pixmap.draw_line(gc, points[15].x, points[15].y, points[8].x, points[8].y)

        #  end plate of column 
        for i in range(16, 19):
            pixmap.draw_line(gc, points[i].x, points[i].y, points[i + 1].x, points[i + 1].y)
            
        pixmap.draw_line(gc, points[19].x, points[19].y, points[16].x, points[16].y)

        #  end plate of column 
        for i in range(20, 23):
            pixmap.draw_line(gc, points[i].x, points[i].y, points[i + 1].x,points[i + 1].y)
        
        pixmap.draw_line(gc, points[23].x, points[23].y, points[20].x, points[20].y)


    def iterate(self, pixmap, gc, style):
        '''
        '''
        rotated = self.rotate(self.points, self.z_deg, self.x_deg, self.y_deg)
        flattened = self.flatten(rotated)
        self.draw_to_pixmap(flattened, pixmap, gc, style)
        
    def move(self, x, y, z):
        
        self.z_deg = self.z_deg + int(z)
        self.x_deg = self.x_deg + int(y)
        self.y_deg = self.y_deg - int(x)       
        
        self.shake()

    def shake(self):

        if (self.z_deg >= 360):
            self.z_deg = self.z_deg - 360
        if (self.z_deg < 0):
            self.z_deg = self.z_deg + 360
        
        if (self.x_deg >= 360):
            self.x_deg = self.x_deg - 360
        if (self.x_deg < 0):
            self.x_deg = self.x_deg + 360

        if (self.y_deg >= 360):
            self.y_deg = self.y_deg - 360
        if (self.y_deg < 0):
            self.y_deg = self.y_deg + 360


--- --- run.py --- --- --- --- --- --- ---

import gtk
import gobject
import random
# ---
from rot import Rot

class Gfx(object):
    '''
    '''    
    def __init__(self):
        '''
        '''
        self.b1_down = False
        self.b2_down = False
        self.b3_down = False
        
        self.b1_x = None
        self.b1_y = None
        
        self.rot = Rot()        
        
        self.started = False
        
        self.i = 0
        
        self.win = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.win.set_title('Fractured Nature')
        self.gw = 640
        self.gh = 480 #int(float(self.gw) / 1.618)
        self.win.resize(self.gw, self.gh)
        self.win.set_position(gtk.WIN_POS_CENTER)
        self.win.connect('destroy', gtk.main_quit)
        #self.win.realize()

        self.da = gtk.DrawingArea()

        self.win.add(self.da)
        self.da.set_size_request(self.gw, self.gh)
        self.win.set_resizable(False)
        
        self.da.connect("expose-event", self.area_expose_cb)
        self.da.connect("button_press_event", self.button_press_event)
        self.da.connect("button_release_event", self.button_released_event)  
        self.da.connect("motion_notify_event", self.motion_notify_event)
        #self.da.connect("scroll_event", self.scroll_event)
            
        self.da.set_events(
            gtk.gdk.EXPOSURE_MASK | 
            gtk.gdk.BUTTON_PRESS_MASK | 
            gtk.gdk.BUTTON_RELEASE_MASK | 
            gtk.gdk.POINTER_MOTION_MASK #| 
         #   gtk.gdk.SCROLL_MASK            
            )
              
        self.da.show()
        self.win.show_all()
    
    def area_expose_cb(self, area, event):
        '''
        '''
        self.area = area
        
        self.style = self.da.get_style()
        self.gc = self.style.fg_gc[gtk.STATE_NORMAL]
        
        self.w, self.h = area.window.get_size()
        
        #for i in dir(area.window): print(i)
        self.started = True

        return True                
        
    def button_press_event(self, widget, event):                    

        if (event.button == 1):            
            self.b1_x = event.x
            self.b1_y = event.y
            self.b1_down = True
        elif (event.button == 3):            
            self.b3_z = event.x
            self.b3_down = True
        elif (event.button == 2):
            self.b2_down = True  
        elif (event.button == 4):
            print(4)
        elif (event.button == 5):
            print(5)
        
        return True

    def motion_notify_event(self, widget, event):
        
        if (self.b1_down == True):
            x = event.x
            y = event.y
            
            d_x = x - self.b1_x
            d_y = y - self.b1_y
            d_z = 0
            
            self.b1_x = x
            self.b1_y = y

            self.rot.move(d_x, d_y, d_z)
        
        elif (self.b3_down == True):
        
            z = event.x
            
            d_z = z - self.b3_z
            
            d_y = 0
            d_x = 0
            
            self.b3_z = z

            self.rot.move(d_x, d_y, d_z)
            
        return True
        
    def button_released_event(self, widget, event):                

        if (event.button == 1):
            self.b1_down = False
        elif (event.button == 2):
            self.b2_down = False
        elif (event.button == 3):
            self.b3_down = False     

        return True   
     

    def nop(self):
        '''
        '''        
        if (self.started != True):
            return True
        
        pixmap = gtk.gdk.Pixmap(self.da.window, self.gw, self.gh, depth=-1)
        pixmap.draw_rectangle(self.style.white_gc, True, 0, 0, self.gw, self.gh)
        
        self.rot.iterate(pixmap, self.gc, self.style)        
        
        self.area.window.draw_drawable(self.gc, pixmap, 0, 0, 0, 0, -1, -1)          
        self.area.show()
       
        return True # repeat

    



g = Gfx()

delay = 50
g.timer = gobject.timeout_add(delay, g.nop)

gtk.main()