Initial commit

README.md

@@ -1,3 +1,10 @@
 # PyScroller
 
-A simple pygame-based text scroller.
+A simple pygame-based text scroller.
+
+# Attribution
+
+This code uses the tileset
+["16x16 Studded Metal Fonts"](https://opengameart.org/content/16x16-studded-metal-fonts)
+by [Jerom](https://opengameart.org/users/jerom), used under
+[CC-BY 3.0](https://creativecommons.org/licenses/by/3.0/).

scroller/char_sheet.py

@@ -0,0 +1,17 @@
+from pygame import image
+
+
+class CharSheet:
+    def __init__(self, filename, characters, char_width, char_height):
+        self.sheet = image.load(filename)
+        self.characters = characters
+        self.char_width = char_width
+        self.char_height = char_height
+
+    def get_sheet(self, character):
+        index = self.characters.index(character.char)
+
+        y = index // self.char_height
+        x = index - (self.char_height * y)
+
+        return [x, y]

scroller/character.py

@@ -0,0 +1,16 @@
+class Character:
+    def __init__(self,
+                 x=0,
+                 y=0,
+                 x_speed=0.1,
+                 y_speed=0.1,
+                 angle=0,
+                 radius=20,
+                 char=' '):
+        self.x = x
+        self.y = y
+        self.x_speed = x_speed
+        self.y_speed = y_speed
+        self.angle = angle
+        self.radius = radius
+        self.char = char

scroller/scroller.py

@@ -0,0 +1,31 @@
+from . import character
+
+
+class Scroller:
+    def __init__(self, text):
+        self.text = text
+        self.next_char = 0
+        self.sheet_chars = []
+
+    def get_next_char(self,
+                      x=0,
+                      y=0,
+                      x_speed=0.1,
+                      y_speed=0.1,
+                      angle=0,
+                      radius=20):
+        self.sheet_chars.append(character.Character(x,
+                                                    y,
+                                                    x_speed,
+                                                    y_speed,
+                                                    angle,
+                                                    radius,
+                                                    self.text[self.next_char]))
+
+        if (self.next_char < (len(self.text) - 1)):
+            self.next_char += 1
+        else:
+            self.next_char = 0
+
+    def delete_first_char(self):
+        self.sheet_chars.pop(0)

test.py

@@ -0,0 +1,73 @@
+import pygame
+import math
+from scroller import scroller
+from scroller import char_sheet
+
+pygame.init()
+
+size = width, height = 320, 240
+
+black = 0, 0, 0
+red = 255, 0, 0
+characters = [' ', '!', '\"', '#', '$', '%',  '&', '\'', '(', ')', '*', '+',
+              ',', '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8',
+              '9', ':', ';', '<', '=', '>', '?', '@', 'A', 'B', 'C', 'D', 'E',
+              'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
+              'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
+              '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
+              'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
+              'z', '{', '|', '}', '~', '©']
+
+char_sheet = char_sheet.CharSheet("jeromBD-metal-CCBY3.png",
+                                  characters, 16, 16)
+
+x = 320
+y = 120
+
+clock = pygame.time.Clock()
+
+scroller = scroller.Scroller("IT'S BEEN... one week since you looked at me, " +
+                             "cocked your head to the side and said \"I'm " +
+                             "angry\"                         ")
+
+screen = pygame.display.set_mode(size)
+
+while 1:
+    dt = clock.tick(60)
+
+    screen.fill(black)
+
+    i = 0
+
+    if not scroller.sheet_chars:
+        scroller.get_next_char(320, 120, 0.1, 2, 0, 20)
+
+    for sheet_char in scroller.sheet_chars:
+        sheet_char.x -= sheet_char.x_speed * dt
+
+        sheet_char.angle += sheet_char.y_speed
+
+        sheet_char.y = ((sheet_char.radius *
+                         math.sin(sheet_char.angle * math.pi / 180)) +
+                        120)
+
+        if (sheet_char.x < -(char_sheet.char_width)):
+            scroller.delete_first_char()
+            i -= 1
+        else:
+            if (i == (len(scroller.sheet_chars) - 1) and
+               sheet_char.x <= (width - char_sheet.char_width)):
+                scroller.get_next_char(320, 120, 0.1, 2, 0, 20)
+                print(str(len(scroller.sheet_chars) - 1) + " | " + str(i) +
+                      " | " + str(scroller.next_char))
+
+            i += 1
+
+        sect = char_sheet.get_sheet(sheet_char)
+        sprite = pygame.Rect((sect[0] * 16),
+                             (sect[1] * 16), 16, 16)
+
+        screen.blit(char_sheet.sheet, (sheet_char.x,
+                    sheet_char.y), sprite)
+
+    pygame.display.flip()