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**zecomeia** · 04-03-2010 12:14 AM

XP Wave Effect
por zecomeia

Introduction

Modifications in Sprite class to use the wave effect of RGSS2.

Features

* Muito fiel ao efeito do RMVX

Screen Shot

[Image: xpeaveeffectss.png]

Download

Demo

Instructions

* Paste the script up of main;
* Use how on RGSS2, if don't know, search for RGSS reference manual in help file of RMVX.

Script

Code:

#========================================

# XP Wave Effect

#----------------------------------------

#by:      zecomeia

#date:    01/03/2010

#for:     RGSS

#version: 1.0

#www.colmeia-do-ze.blogspot.com

#----------------------------------------

=begin

Reproduction of the VX's wave effect

(see the help file of the RPGMaker VX 

in the RGSS manual reference topic)

=end

#==============#

# Sprite class #

#==============#

class Sprite

  include Math

  attr_accessor   :wave_amp

  attr_accessor   :wave_length

  attr_accessor   :wave_speed

  attr_accessor   :wave_phase

  attr_accessor   :temp_bitmap

  alias initialize default_initialize rescue nil

  alias default_initialize initialize

  def initialize(viewport=nil)

    @wave_amp = 0

    @wave_length = 180

    @wave_speed = 360

    @wave_phase = 0.0

    default_initialize(viewport)

    @temp_bitmap = nil

  end

  alias update default_update rescue nil

  alias default_update update  

  def update()

    # the wave effect only works if wave_amp

    # propertie is a number more than zero

    wave_effect if @wave_amp > 0

    default_update()

  end

  # Return the width of image, because when use

  # obj.bitmap.width the value will be more than

  # the original value(because effect)

  def width()

    return (self.bitmap.width - @wave_amp * 2)

  end

  #---------------

  # Wave Effect

  #---------------

  def wave_effect()

    return if self.bitmap.nil?

    @temp_bitmap = self.bitmap if @temp_bitmap.nil?

    cw = @temp_bitmap.width + (@wave_amp * 2)

    ch = @temp_bitmap.height

    # Follow the VX wave effect, each horizontal line

    # has 8 pixel of height. This device provides less

    # lag in game.

    divisions = @temp_bitmap.height / 8

    divisions += 1 if @temp_bitmap.height % 8 != 0

    self.bitmap = Bitmap.new(cw, ch)

    for i in 0..divisions

      x = @wave_amp * Math.sin(i * 2 * PI / (@wave_length / 8).to_i + Math.deg_to_rad(@wave_phase))

      src_rect = Rect.new(0, i*8, @temp_bitmap.width, 8)

      dest_rect = Rect.new(@wave_amp + x, i * 8, @temp_bitmap.width, 8)

      self.bitmap.stretch_blt(dest_rect, @temp_bitmap, src_rect)

    end

    # frame rate: VX = 60 | XP = 40

    # wave speed compatibility VX to XP: wave_speed * 60/40

    # then: wave_speed * 1.5

    @wave_phase += @wave_speed * 1.5 / @wave_length

    @wave_phase -= 360 if @wave_phase > 360

    @wave_phase += 360 if @wave_phase < 0

  end

end

#=============#

# module Math #

#=============#

module Math

  #-------------------------------

  # Conversion Degree to Radian

  #-------------------------------

  def Math.deg_to_rad(deg)

    return (deg * PI) / 180.0

  end

end

Credits and Thanks
zecomeia

Scripts RGSS, Resources, Tutorials and Translations by zecomeia is licensed under a
Creative Commons AtribuiÃ§Ã£o-Uso NÃ£o-Comercial-Compartilhamento pela mesma LicenÃ§a 2.5 Brasil License.
Permissions beyond the scope of this license may be available at SantuÃ¡rio RPG Maker

**PK8** · 04-03-2010 12:15 AM

Moving this to the scripts section.

Edit: Haha, I like it! But I get a bit of lag using it. I was trying it out on the title sprite with wave_amp and wave_length set to 320. :P Still, this is pretty cool. :)

**zecomeia** · 04-03-2010 02:30 PM

Quote:Moving this to the scripts section.

Sorry, I was distracted when I posted the script.

Thanks!
The lag is a really problem, but I don't know how to decrease it and keep the normal operation.
I am free for sugestions ^^

Bye

**EJlol** · 04-04-2010 12:35 PM

only use radians instead of degrees. If you want the user to be able to use degrees, write a setter and a getter that converts it.

Im not sure how optimized the cos() and sin() functions are in ruby. It might be faster if you calc the values of the cos() and sin() when the game starts, and cache it into a table, so that you don't have to calc it every frame update.

**Ace** · 04-04-2010 02:09 PM

Nice! and doesn't lag very much for me, just a little bit.

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