rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

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rdlc data matrix,

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def is_over(self, point): # Return True if a point is over the button point_x, point_y = point x, y = self.position w, h = self.image.get_size() x -= w /2 y -= h / 2 in_x = point_x >= x and point_x < x + w in_y = point_y >= y and point_y < y + h return in_x and in_y def run(): pygame.mixer.pre_init(44100, -16, 2, 1024*4) pygame.init() screen = pygame.display.set_mode(SCREEN_SIZE, 0) default_font = pygame.font.get_default_font() font = pygame.font.SysFont("default_font", 50, False) # Create our buttons x = 100 y = 240 button_width = 150 # Store the buttons in a dictionary, so we can assign them names buttons = {} buttons["prev"] = Button("prev.png", (x, y)) buttons["pause"] = Button("pause.png", (x+button_width*1, y)) buttons["stop"] = Button("stop.png", (x+button_width*2, y)) buttons["play"] = Button("play.png", (x+button_width*3, y)) buttons["next"] = Button("next.png", (x+button_width*4, y)) # Get a list of files in MUSIC_PATH music_filenames = get_music(MUSIC_PATH) if len(music_filenames) == 0: print "No OGG files found in ", MUSIC_PATH return white = (255, 255, 255) label_surfaces = []

As shown in 3, type annotations provide a way of constraining an identifier, usually a parameter of a function, to a certain type. What might seem counterintuitive to an OO programmer is that the form of type annotation introduced in 3 is rigid; in other words, it does not take into account the inheritance hierarchy. This means that if you apply such a type annotation to an expression, then that expression must have precisely that type statically; a derived type will not fit in its place. To illustrate this point, consider the following example: open System.Windows.Forms let showForm (form : Form) = form.Show()

# Render the track names for filename in music_filenames: txt = os.path.split(filename)[-1] print "Track:", txt txt = txt.split('.')[0] surface = font.render(txt, True, (100, 0, 100)) label_surfaces.append(surface) current_track = 0 max_tracks = len(music_filenames) # Load the first track pygame.mixer.music.load( music_filenames[current_track] ) clock = pygame.time.Clock() playing = False paused = False # This event is sent when a music track ends TRACK_END = USEREVENT + 1 pygame.mixer.music.set_endevent(TRACK_END) while True: button_pressed = None for event in pygame.event.get(): if event.type == QUIT: return if event.type == MOUSEBUTTONDOWN: # Find the pressed button for button_name, button in buttons.iteritems(): if button.is_over(event.pos): print button_name, "pressed" button_pressed = button_name break

Finally, Listing 7-1 has a test case defined by a method with the [Test] attribute above it. This tells NUnit the test case to run. The sample test case declares two dates with timestamps. One date indicates the day and time of departure, and the other date indicates the day and time of arrival. The test case then calls the ScheduleFlight method of the Flight object that was created in the setup method, passing the dates of the departure and arrival. You know the Flight object exists because the setup method is called before each test case. The real testing part of the test case happens when you check that the departure and arrival dates that you set up for the flight equal the departure and arrival dates that you defined. The NUnit testing framework has special Assert methods that allow you to check things like equality. The example checks that the flight s departure date equals the defined departure date. If the dates are not equal, the test case fails. If the dates are equal, the test case passes. In either situation, the test class would continue on to the next test case and so on, until all the test cases have been run.

// PrintPreviewDialog is defined in the BCL and is // derived directly the Form class let myForm = new PrintPreviewDialog() showForm myForm When you try to compile the previous example, you receive the following error: Progfs(11,10): error: FS0001: This expression has type PrintPreviewDialog but is here used with type Form One way to call a function with a rigid type annotation on a parameter is to use an explicit upcast at the place where you call the function to change the type so it s the same as the type of the function s parameter The following line of code changes the type of myForm to match the type of the parameter of showForm: showForm (myForm :> Form) Upcasting the argument to showForm is a solution, but it s not a pretty one because it means littering client code with upcasts.

So, F# provides another type annotation, the derived type annotation, in which the type name is prefixed with a hash sign This has the effect of constraining an identifier to be of a certain type or any of its derived types This means you can rewrite the preceding example to remove the need for explicit upcasts in the calling code, which is a huge benefit to anyone using the functions you define: open System open SystemWindowsForms let showFormRevised (form : #Form) = formShow() // ThreadExceptionDialog is define in the BCL and is // directly derived type of the Form class let anotherForm = new ThreadExceptionDialog(new Exception()) showFormRevised anotherForm You can use this kind of type annotation to tidy up code that uses a lot of casting.