Lemma Soft Forums

Posted: **Sat Apr 27, 2024 5:17 pm**

I've messing with CDD's for a while and I'm trying to make a parallax effect with some sort of smoothness when you click and drag the mouse around the screen (left to right)

The major problem I'm having is how to calculate and apply the smoothness to the displayable movement, I tried many different ways without much result, so I decided to remove the failed attemps and put the base code below

NOTE: I know there are a few already done parallax out there but my main focus is learning and not copy-pasting.

Code: Select all

init python:
    import pygame as pyg

    class Parallax(renpy.Displayable):
        def __init__(self, child, dist=.05, xanchor=0.5, **kwargs):
            super().__init__(**kwargs)
            self.child = renpy.displayable(child)
            self.dist = dist
            self.xanchor = xanchor
        
        def render(self, width, height, st, at):
            left_click = pyg.mouse.get_pressed()[0]
            xmouse, ymouse = renpy.get_mouse_pos()

            child = renpy.render(self.child, width, height, st, at)
            
            render = renpy.Render(width, height)
            cw, ch = child.get_size()

            pos  = (width * self.xanchor)
            xpos = (pos - (cw * .5))
            off = (cw * self.dist)
                                                                        
            if left_click:
                xpos += (xmouse - pos) / off

            x, y = (xpos, height - ch)

            render.blit(child, (x, y))
            
            renpy.redraw(self, 0)

            return (render)

        def visit(self):
            return [ self.child ]

This works as expected by positioning the display in the correct position and calculating where it should be, but it just sets the position abruptly, and I want this to happen easily, I thought about changing it to a Transform() but I don't know if that's valid

Two Boxes Gif Here an example on how it looks

any suggestion or improvement is welcome, criticism too.

Posted: **Sun Apr 28, 2024 2:43 am**

I usually get smooth movement by having variables like `x_target` and add to `x` a small amount till it reaches that target. But I'm sure there are better ways to larp between those values.

Posted: **Sun Apr 28, 2024 12:28 pm**

Kia wrote: ↑Sun Apr 28, 2024 2:43 am I usually get smooth movement by having variables like `x_target` and add to `x` a small amount till it reaches that target. But I'm sure there are better ways to larp between those values.

I want to thank you! I manage to make the movement smooth while increasing and decreasing, I'm pretty sure I can improve it but so far it's looking good

Code: Select all

        def render(self, width, height, st, at):
            left_click = pyg.mouse.get_pressed()[0]
            xmouse, ymouse = renpy.get_mouse_pos()

            child = renpy.render(self.child, width, height, st, at)
            
            render = renpy.Render(width, height)
            cw, ch = child.get_size()

            pos = (width * self.xanchor)
            xpos = (pos - (cw * .5))
            off = (cw * self.dist)
            
            self.pos = (pos - (cw * .5))
            self.min = (0 - pos) / off
            self.max = (width - pos) / off
            
            i = 0.5
            v = i if (xmouse - self.pos) / off > 0 else -i
            d = i if self.x < 0 else -i
            
            if left_click:
                self.x += v
                self.pos = xpos + self.x
            
            else:
                if not left_click and self.x != 0:
                    d = max(0, d) if d > 0 else min(0, d)
                    self.x += d
                    self.pos = xpos + self.x

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CDD Parallax Effect w/ Smoothness

CDD Parallax Effect w/ Smoothness

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Re: CDD Parallax Effect w/ Smoothness