Toy script for RF3: draw animated pixels in a tiny window, save to gif.

blinkenDraw.py

# coding: utf-8
import os
import vanilla
import mojo.canvas
from mojo.UI import PutFile
from random import random
from mojo.drawingTools import *
import drawBot
from AppKit import NSTimer

#    http://robofont.com/documentation/building-tools/api/mojo/mojo-canvas/?highlight=canvas

"""
    A small toy that shows the RoboFont3 CanvasGroup.
    Requires: the DrawBot extension.
    erik@letterror.com
    
    space: start / stop animation so you can draw on individual frames
    up / down arrows: step through the frames if the animation is stopped.
    
    
"""

class TW(object):
    _small = "".join(chr(m) for m in [9999, 65039, 9643, 65039])
    _big = "".join(chr(m) for m in [9999, 65039, 9723, 65039])
    _save = "".join(chr(m) for m in [128250, 128230])
    _erase = "".join(chr(m) for m in [10006, 65039])
    def __init__(self):
        #print("_small", [ord(b) for b in self._small])
        #print("_big", [ord(b) for b in self._big])
        #print("_save", [ord(b) for b in self._save])
        #print("_erase", [ord(b) for b in self._erase])
        self.points = {}
        self.w = vanilla.Window((200, 230), title="BlinkenDraw")
        self.w.c = mojo.canvas.CanvasGroup((0,30,200,200), delegate=self)
        self.w.b = vanilla.Button((5, 5, 50, 20), self._save, callback=self.callbackExport)
        self.w.s = vanilla.Button((60, 5, 45, 20), self._small, callback=self.callbackPenSize)
        self.w.e = vanilla.Button((110, 5, 30, 20), self._erase, callback=self.callbackErase)
        self.w.t = vanilla.TextBox((-45, 7, 40, 20), "0", sizeStyle="small", alignment="right")
        self.w.bind("close", self.callbackClose)
        self.maxFrames = 10
        self.dotSize = 5
        self.currentFrame = 0
        self.timerInterval = .0025
        self.timer = None
        self.running = True
        self.w.open()
    
    def callbackErase(self, sender):
        # if we're running: clear the whole thing.
        # if we're not running, clear the current frame
        if self.running:
            self.points = {}
        else:
            self.points[self.currentFrame] = []
            self.w.c.update()
            
    def callbackPenSize(self, sender):
        if self.dotSize == 5:
            self.dotSize = 20
            self.w.s.setTitle(self._small)
        else:
            self.dotSize = 5
            self.w.s.setTitle(self._big)
            
    def callbackExport(self, sender):
        # use drawbot to export the thing
        if self.timer is not None:
            self.timer.invalidate()
            self.timer = None
        state = self.running
        self.running = False
        a, b, _w, _h = self.w.c.getPosSize()
        path = PutFile("Save this gif as", "blinkenDraw.gif")
        if path is None:
            return
        drawBot.newDrawing()
        for i in range(len(self.points)):
            drawBot.newPage(width=_w, height=_h)
            drawBot.frameDuration(0.025)
            drawBot.fill(0)
            drawBot.rect(0,0,_w, _h)
            frame = self.points.get(i)
            if not frame:
                continue
            drawBot.fill(1)
            for p in frame:
                ds = self.dotSize
                pos = p[0]-.5*ds, p[1]-.5*ds
                drawBot.rect(pos[0], pos[1],ds,ds)
        drawBot.saveImage(path)
        drawBot.endDrawing()
        self.running = state    
        
    def callbackClose(self, sender):
        self.timer = None
        
    def draw(self):
        a, b, w, h = self.w.getPosSize()
        fill(0)
        rect(0,0,w,h)
        frame = self.points.get(self.currentFrame)
        if not frame:
            self.scheduleTimer()
            return
        fill(1)
        self.w.t.set("{frameCount}/{maxFrames}".format(**dict(frameCount=self.currentFrame, maxFrames=self.maxFrames)))
        for p in frame:
            ds = self.dotSize + .1*random() -0.2
            pos = p[0]-.5*ds, p[1]-.5*ds
            rect(pos[0], pos[1],ds,ds)
        if self.running:
            self.nextFrame()
            self.scheduleTimer()
    
    def scheduleTimer(self):
        if self.timer is not None:
            self.timer.invalidate()
            self.timer = None
        if self.running:
            self.timer = NSTimer.scheduledTimerWithTimeInterval_target_selector_userInfo_repeats_(self.timerInterval, self, "animateCallback:", None, False)
    
    def animateCallback_(self, timer):
        self.w.c.update()
        self.scheduleTimer()
    
    def nextFrame(self):
        self.currentFrame += 1
        if self.currentFrame > self.maxFrames:
            self.currentFrame = 0

    def previousFrame(self):
        self.currentFrame -= 1
        if self.currentFrame < 0:
            self.currentFrame = self.maxFrames-1
    
    def addPixel(self, command, pos):
        a, b, w, h = self.w.getPosSize()
        f = (int(pos.x), int(pos.y))
        f = f[0]-f[0]%self.dotSize+.5*self.dotSize, f[1]-f[1]%self.dotSize+.5*self.dotSize
        if not self.currentFrame in self.points:
            self.points[self.currentFrame] = []
        if command == 'd' and f in self.points[self.currentFrame]:
            self.points[self.currentFrame].remove(f)
            return
        if f not in self.points[self.currentFrame]:
            self.points[self.currentFrame].append(f)
        
    def keyDown(self, event):
        if event.keyCode() == 49:
            self.running = not self.running
        if event.keyCode() == 126:
            # arrow up
            self.previousFrame()
            self.w.c.update()
        elif event.keyCode() == 125:
            # arrow down
            self.nextFrame()
            self.w.c.update()
        if self.running:
            self.scheduleTimer()
            
    def mouseDown(self, event):
        self.addPixel("d", event.locationInWindow())
        self.w.c.update()

    def mouseDragged(self, event):
        self.addPixel("l", event.locationInWindow())
        self.w.c.update()
        
OpenWindow(TW)