quickened_swarm

# Bouncing particle swarm animation
# Copyright 2021, 2023 Roland Richter                    [Processing.py]

from __future__ import print_function

# Each particle holds data about
# - its look, i.e. the text to display, and its color ("face" and "color")
# - its current horizontal and vertical position ("x" and "y")
# - its current horizontal and vertical velocity ("vx" and "vy")
# TRY to add a field "size" which determines how large the particle is.
particles = [
    {"face": "O.O", "colour": color(120, 80, 80), "x": 450, "y": 300, "vx": -2, "vy": 5, },
    {"face": "^l^", "colour": color(240, 80, 80), "x": 150, "y": 500, "vx": 5, "vy": 2, },
    {"face": ">^_^<", "colour": color(360, 80, 80), "x": 550, "y": 100, "vx": -5, "vy": -2, },
]

def create_particle(face):
    """Create a particle with the given face; all other fields are set to random values."""
    new_particle = {"face": face}
    new_particle["colour"] = color(random(0, 360), 80, 80)
    new_particle["x"] = random(50, width-50)
    new_particle["y"] = random(50, height-50)
    new_particle["vx"] = random(2, 8)
    new_particle["vy"] = random(2, 8)

    return new_particle


def setup():
    size(900, 600)
    colorMode(HSB, 360, 100, 100)

    textSize(26)
    textAlign(CENTER, CENTER)

    # Add nine particles to the global list
    global particles
    for k in range(9):
        new_particle = create_particle("(-;")
        particles.append(new_particle)

    frameRate(30)


def draw():
    background("#00BFFF")   # "Deep sky blue"

    global particles
    # Update position and velocity of each particle
    for p in particles:
        # Compute new x/y position by adding x/y velocity
        p["x"] += p["vx"]
        p["y"] += p["vy"]

        # Bounce off the edge if necessary: reverse the horizontal or
        # vertical part of velocity vector (i.e. flip its sign)
        # TRY to change the particles' colour with each bounce
        if p["x"] < 25 or p["x"] > width-25:
            p["vx"] = -p["vx"]
        if p["y"] < 25 or p["y"] > height-25:
            p["vy"] = -p["vy"]

    # Draw each particle as a colored cirlce, write text in white
    for p in particles:
        fill(p["colour"])
        circle(p["x"], p["y"], 50)
        fill("#FFFFFF")
        text(p["face"], p["x"], p["y"]-4)


# TRY to create a new particle at mouse click


# ----------------------------------------------------------------------
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.