e.append(Particle(0, 0, mass=random(10,50), radius=MASS, life=random(50,250)))
s.append(e) # Install the emitter in the system.
# Add an obstacle that other particles want to stay away from.
class Obstacle(Particle):
def draw(self):
# The only way to style individual particles is to redefine draw() in a subclass.
# Set the fill color directly for this ellipse, i.e. don't use fill(),
# because this sets the state and then other particles might use this color too.
ellipse(self.x, self.y, self.radius*2, self.radius*2, fill=(0,0,0.3,0.1))
obstacle = Obstacle(0, 0, mass=70, radius=70, fixed=True)
s.append(obstacle)
s.force(6, source=obstacle) # Repulsive force from this particle to all others.
def draw(canvas):
background(1)
fill(0,0.5,1,0.1)
stroke(0,0.3)
strokewidth(1)
s.update()
s.draw()
# Put the obstacle at the mouse position.
# This way we can play around with the fountain spray.
obstacle.x = canvas.mouse.x
obstacle.y = canvas.mouse.y
# Add the upper directory (where the nodebox module is) to the search path.
import os, sys
sys.path.insert(0, os.path.join("..", ".."))
from nodebox.graphics import *
from nodebox.graphics.physics import Particle, Force, System
# This example demonstrates the Animation object,
# which can be used to store and replay a sequence of image frames.
# This is useful for caching pre-rendered effects, like a spell or an explosion.
# This is just the explosion system from the previous example in a more condensed form.
s = System(gravity=(0, 1.0))
for i in range(80):
s.append(Particle(x=200, y=250, mass=random(5.0, 10.0), radius=5, life=30))
s.force(strength=4.5, threshold=70)
# Instead of drawing the system directly to the canvas,
# we render each step offscreen as an image,
# and then gather the images in an animation loop.
explosion = Animation(duration=0.75, loop=False)
for i in range(30):
s.update(limit=20)
img = render(s.draw, 400, 400)
explosion.append(img)
# This can take several seconds:
# - calculating forces in the system is costly (if possible, load Psyco to speed them up),
# - rendering each image takes time (specifically, initialising a new empty image).
# If possible, reduce the image frames in size (smaller images = faster rendering).
from nodebox.graphics.context import *
from nodebox.graphics import *
from nodebox.graphics.physics import Particle, Force, System
from nodebox.graphics.shader import render
# This example demonstrates the Animation object,
# which can be used to store and replay a sequence of image frames.
# This is useful for caching pre-rendered effects, like a spell or an explosion.
# This is just the explosion system from the previous example in a more condensed form.
s = System(gravity=(0, 1.0))
for i in range(80):
s.append(Particle(x=200, y=250, mass=random(5.0,10.0), radius=5, life=30))
s.force(strength=4.5, threshold=70)
# Instead of drawing the system directly to the canvas,
# we render each step offscreen as an image,
# and then gather the images in an animation loop.
explosion = Animation(duration=0.75, loop=False)
for i in range(30):
s.update(limit=20)
img = render(s.draw, 400, 400)
explosion.append(img)
# This can take several seconds:
# - calculating forces in the system is costly (if possible, load Psyco to speed them up),
# - rendering each image takes time (specifically, initialising a new empty image).
# If possible, reduce the image frames in size (smaller images = faster rendering).
e.append(Particle(0, 0, mass=random(10,50), radius=MASS, life=random(50,250)))
s.append(e) # Install the emitter in the system.
# Add an obstacle that other particles want to stay away from.
class Obstacle(Particle):
def draw(self):
# The only way to style individual particles is to redefine draw() in a subclass.
# Set the fill color directly for this ellipse, i.e. don't use fill(),
# because this sets the state and then other particles might use this color too.
ellipse(self.x, self.y, self.radius*2, self.radius*2, fill=(0,0,0.3,0.1))
obstacle = Obstacle(0, 0, mass=70, radius=70, fixed=True)
s.append(obstacle)
s.force(6, source=obstacle) # Repulsive force from this particle to all others.
def draw(canvas):
background(1)
fill(0,0.5,1,0.1)
stroke(0,0.3)
strokewidth(1)
s.update()
s.draw()
# Put the obstacle at the mouse position.
# This way we can play around with the fountain spray.
obstacle.x = canvas.mouse.x
obstacle.y = canvas.mouse.y
