Hi,in another post I found a way to achieve my goal of converting the coordinate position to camera space and then scaling it to a small size so that he appears first.

this is new code:

def Draw(self,op, drawpass, bd, bh):
    
    
    if not op[c4d.S_MOTIONTRAIL_GTWO_DRAWENABLE]:
        return c4d.DRAWRESULT_OK
    #bd.SetMatrix_Matrix(None, c4d.Matrix())
    pmg = ~bd.GetMg()
    bd.SetMatrix_Camera()

    all_pos = self.parameters['all_pos']
    color_lis = self.parameters['color_lis']
    point_size = op[c4d.S_MOTIONTRAIL_GTWO_POINTSIZE]
    bd.SetPointSize(point_size)
    for per_pos,color in zip(all_pos,color_lis):
        bd.SetPen(color)
        cnt = len(per_pos)
        temp_lis = []
        for i in xrange(cnt-1):
            c = (pmg * per_pos[i]).GetNormalized() * 20
            f = (pmg * per_pos[i+1]).GetNormalized() * 20
            bd.DrawLine(c,f,c4d.NOCLIP_D)
            temp_lis.append(c)
        temp_lis.append(f)
        bd.DrawPoints(temp_lis)
    

    return c4d.DRAWRESULT_OK

why * 20 will work, * 1or 2 not work (c = (pmg * per_pos[i]).GetNormalized() * 20)?

I found a solution in other posts, and this is an video example:

example code:

import c4d

from c4d import bitmaps,gui





class DraggingArea(c4d.gui.GeUserArea):
    def __init__(self):
        self.startx = 0
        self.starty = 0

    def DrawMsg(self, x1, y1, x2, y2, msg):


        # Initializes draw region
        self.OffScreenOn()
        self.SetClippingRegion(x1, y1, x2, y2)
        icon_bmp = bitmaps.InitResourceBitmap(5159)
        icon_clip = bitmaps.GeClipMap()
        icon_clip.InitWithBitmap(icon_bmp,icon_bmp.GetInternalChannel())

        clip = bitmaps.GeClipMap()
        w,h = self.GetWidth(),self.GetHeight()
        clip.Init(w,h)
        clip.BeginDraw()
        clip.SetColor(0,0,180)
        clip.FillRect(0,0,w,int(h*0.4))
        clip.SetColor(180,0,0)
        clip.FillRect(0,int(h*0.4),w,h)

        clip.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND,255)
        clip.Blit(self.startx,self.starty,icon_clip,0,0,icon_clip.GetBw(),icon_clip.GetBh(),c4d.GE_CM_BLIT_COL)


        clip.EndDraw()
        # Get default Background color
        bmp = clip.GetBitmap()
        self.DrawBitmap(bmp,0,0,w,h,0,0,w,h,c4d.BMP_NORMAL)




    def InputEvent(self, msg):
        """
        Called by Cinema 4D, when there is a user interaction (click) on the GeUserArea.
        This is the place to catch and handle drag interaction.

        :param msg: The event container.
        :type msg: c4d.BaseContainer
        :return: True if the event was handled, otherwise False.
        :rtype: bool
        """
        # Do nothing if its not a left mouse click event
        if msg[c4d.BFM_INPUT_DEVICE] != c4d.BFM_INPUT_MOUSE and msg[c4d.BFM_INPUT_CHANNEL] != c4d.BFM_INPUT_MOUSELEFT:
            return True

        # Retrieves the initial position of the click
        mouseX = msg[c4d.BFM_INPUT_X]
        mouseY = msg[c4d.BFM_INPUT_Y]
        mouse_pos_dict = self.Global2Local()
        x, y = mouse_pos_dict['x'] + msg.GetInt32(c4d.BFM_INPUT_X), mouse_pos_dict['y'] + msg.GetInt32(
            c4d.BFM_INPUT_Y)  
        self.startx = x
        self.starty = y

        # Initializes the start of the dragging process (needs to be initialized with the original mouseX, mouseY).
        self.MouseDragStart(c4d.KEY_MLEFT, mouseX, mouseY, c4d.MOUSEDRAGFLAGS_DONTHIDEMOUSE | c4d.MOUSEDRAGFLAGS_NOMOVE)
        isFirstTick = True

        # MouseDrag needs to be called all time to update information about the current drag process.
        # This allow to catch when the mouse is released and leave the infinite loop.
        while True:

            # Updates the current mouse information
            result, deltaX, deltaY, channels = self.MouseDrag()
            if result != c4d.MOUSEDRAGRESULT_CONTINUE:
                break

            # The first tick is ignored as deltaX/Y include the mouse clicking behavior with a deltaX/Y always equal to 4.0.
            # However it can be useful to do some initialization or even trigger single click event
            if isFirstTick:
                isFirstTick = False
                continue

            # If the mouse didn't move, don't need to do anything
            if deltaX == 0.0 and deltaY == 0.0:
                continue

            # Updates mouse position with the updated delta
            mouseX -= deltaX
            mouseY -= deltaY
            x -= deltaX
            y -= deltaY
            self.startx = int(x)
            self.starty = int(y)




            # Redraw the GeUserArea (it will call DrawMsg)
            self.Redraw()

        # Asks why we leave the while loop
        endState = self.MouseDragEnd()



        return True


class MyDialog(c4d.gui.GeDialog):
    """
    Creates a Dialog with only a GeUserArea within.
    """

    def __init__(self):
        # It's important to stores our Python implementation instance of the GeUserArea in class variable,
        # This way we are sure the GeUserArea instance live as long as the GeDialog.
        self.area = DraggingArea()

    def CreateLayout(self):
        """
        This method is called automatically when Cinema 4D Create the Layout (display) of the Dialog.
        """
        self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)
        self.AttachUserArea(self.area, 1000)
        return True


def main():
    # Creates a new dialog
    dialog = MyDialog()

    # Opens it
    dialog.Open(dlgtype=c4d.DLG_TYPE_MODAL_RESIZEABLE, defaultw=500, defaulth=500)


if __name__ == '__main__':
    main()

@r_gigante @zipit
The detailed explanation is shown below
“up interpolattion”


Try use "spline trail"

I read some papers, but always been very slow, just only expanded know, such as Frenet–Serret formulas etc. But I did not directly find a better way to replace my current method, and I have been looking for it.

Computation of Rotation Minimizing Frames This seems to be a good paper, I will read it carefully.

@m_adam Thank you for your team's reply.
I will share my exploration in this post in the future.

The problem has been resolved, reinstall the graphics driver and perform a custom clean installation！

try use GetDirty(DIRTYFLAGS_CACHE)，compare last dirty and current dirty

@i_mazlov Thank you for your detailed reply, it was really helpful！
The following video shows the results, which work well. The blue polygon uses GetPolyPointST()

Hi,
you can read this thread

Hi @i_mazlov
Through exploring these two pages，page1,page2, I have converted them into Python code Inverse_Bilinear_Interpolation(), which can replace GetPolyPointST(). I am not sure why GetPolyPointST() may obtain incorrect values in certain situations, but Inverse_Bilinear_Interpolation() does not go wrong in complex situations.

video use Inverse_Bilinear_Interpolation()

code:

import math


# algorithm_InverseBilinearInterpolation 逆双线性插值 的算法

def Wedge2D(v:c4d.Vector,w:c4d.Vector):
    return v[0] * w[1] - v[1] * w[0]

def Inverse_Bilinear_Interpolation(p:c4d.Vector,p0:c4d.Vector,p1:c4d.Vector,p3:c4d.Vector,p2:c4d.Vector):

    """
    注意对点顺序的定义
    Attention :  points Order

    p2 --- p3
    |      |
    |      |
    p0 --- p1

    """

    q = p - p0
    b1 = p1 - p0
    b2 = p2 - p0
    b3 = p0 - p1 - p2 + p3

    A = Wedge2D(b2,b3)
    B = Wedge2D(b3,q) - Wedge2D(b1,b2)
    C = Wedge2D(b1,q)
    # 求V - solve v
    if abs(A) < 0.00000001:
        v = -C / B
    else:
        discrim = B * B - 4.0 * A * C
        v = 0.5 * (-B - math.sqrt(discrim)) / A  # CCW
        #v = 0.5 * (-B + math.sqrt(discrim)) / A  # CW

    # 求 u - solve u
    denom = b1 + v * b3

    if abs(denom[0]) > abs(denom[1]):
        u = (q[0] - b2[0] * v) / denom[0]
    else:
        u = (q[1] - b2[1] * v) / denom[1]

    return u,v
# example use CPolygon point position a,b,c,d, and point p in quard(CPolygon)
# u,v = Inverse_Bilinear_Interpolation(p,a,b,c,d)

sample file: custom-quadrilateral.c4d

But for the code part, there are still some doubts about the difference between CCW and CW. When I understand what's going on, I will come back and reply. If any friend can explain, that's the best!

Hi,
i read python sdk BaseContainer.FindIndex() return a bool but actually return a dict

I found a solution in other posts, and this is an video example:

example code:

import c4d

from c4d import bitmaps,gui





class DraggingArea(c4d.gui.GeUserArea):
    def __init__(self):
        self.startx = 0
        self.starty = 0

    def DrawMsg(self, x1, y1, x2, y2, msg):


        # Initializes draw region
        self.OffScreenOn()
        self.SetClippingRegion(x1, y1, x2, y2)
        icon_bmp = bitmaps.InitResourceBitmap(5159)
        icon_clip = bitmaps.GeClipMap()
        icon_clip.InitWithBitmap(icon_bmp,icon_bmp.GetInternalChannel())

        clip = bitmaps.GeClipMap()
        w,h = self.GetWidth(),self.GetHeight()
        clip.Init(w,h)
        clip.BeginDraw()
        clip.SetColor(0,0,180)
        clip.FillRect(0,0,w,int(h*0.4))
        clip.SetColor(180,0,0)
        clip.FillRect(0,int(h*0.4),w,h)

        clip.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND,255)
        clip.Blit(self.startx,self.starty,icon_clip,0,0,icon_clip.GetBw(),icon_clip.GetBh(),c4d.GE_CM_BLIT_COL)


        clip.EndDraw()
        # Get default Background color
        bmp = clip.GetBitmap()
        self.DrawBitmap(bmp,0,0,w,h,0,0,w,h,c4d.BMP_NORMAL)




    def InputEvent(self, msg):
        """
        Called by Cinema 4D, when there is a user interaction (click) on the GeUserArea.
        This is the place to catch and handle drag interaction.

        :param msg: The event container.
        :type msg: c4d.BaseContainer
        :return: True if the event was handled, otherwise False.
        :rtype: bool
        """
        # Do nothing if its not a left mouse click event
        if msg[c4d.BFM_INPUT_DEVICE] != c4d.BFM_INPUT_MOUSE and msg[c4d.BFM_INPUT_CHANNEL] != c4d.BFM_INPUT_MOUSELEFT:
            return True

        # Retrieves the initial position of the click
        mouseX = msg[c4d.BFM_INPUT_X]
        mouseY = msg[c4d.BFM_INPUT_Y]
        mouse_pos_dict = self.Global2Local()
        x, y = mouse_pos_dict['x'] + msg.GetInt32(c4d.BFM_INPUT_X), mouse_pos_dict['y'] + msg.GetInt32(
            c4d.BFM_INPUT_Y)  
        self.startx = x
        self.starty = y

        # Initializes the start of the dragging process (needs to be initialized with the original mouseX, mouseY).
        self.MouseDragStart(c4d.KEY_MLEFT, mouseX, mouseY, c4d.MOUSEDRAGFLAGS_DONTHIDEMOUSE | c4d.MOUSEDRAGFLAGS_NOMOVE)
        isFirstTick = True

        # MouseDrag needs to be called all time to update information about the current drag process.
        # This allow to catch when the mouse is released and leave the infinite loop.
        while True:

            # Updates the current mouse information
            result, deltaX, deltaY, channels = self.MouseDrag()
            if result != c4d.MOUSEDRAGRESULT_CONTINUE:
                break

            # The first tick is ignored as deltaX/Y include the mouse clicking behavior with a deltaX/Y always equal to 4.0.
            # However it can be useful to do some initialization or even trigger single click event
            if isFirstTick:
                isFirstTick = False
                continue

            # If the mouse didn't move, don't need to do anything
            if deltaX == 0.0 and deltaY == 0.0:
                continue

            # Updates mouse position with the updated delta
            mouseX -= deltaX
            mouseY -= deltaY
            x -= deltaX
            y -= deltaY
            self.startx = int(x)
            self.starty = int(y)




            # Redraw the GeUserArea (it will call DrawMsg)
            self.Redraw()

        # Asks why we leave the while loop
        endState = self.MouseDragEnd()



        return True


class MyDialog(c4d.gui.GeDialog):
    """
    Creates a Dialog with only a GeUserArea within.
    """

    def __init__(self):
        # It's important to stores our Python implementation instance of the GeUserArea in class variable,
        # This way we are sure the GeUserArea instance live as long as the GeDialog.
        self.area = DraggingArea()

    def CreateLayout(self):
        """
        This method is called automatically when Cinema 4D Create the Layout (display) of the Dialog.
        """
        self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)
        self.AttachUserArea(self.area, 1000)
        return True


def main():
    # Creates a new dialog
    dialog = MyDialog()

    # Opens it
    dialog.Open(dlgtype=c4d.DLG_TYPE_MODAL_RESIZEABLE, defaultw=500, defaulth=500)


if __name__ == '__main__':
    main()

Hi
I drew some images in UserArea use DrawBitmap(), but when I overlaid the images, the alpha of the final drawn image was not transparent, but the color of DrawSetPen() was used. How can I make the transparent area of the overlaid image display the color of the lower layer.

my code :

self.DrawSetPen(c4d.Vector(0))
self.DrawBitmap(dragbmp,x, y, width, height,  0, 0, width, height, c4d.BMP_ALLOWALPHA)

This is an example of a video where when I drag the image, the transparent area of the image turns black and the background color is not displayed:

Thanks for any help!

@ferdinand Thanks

@ferdinand
--video:

--code:

import c4d
from c4d import gui
# Welcome to the world of Python
def LoadCustomIcon(input_v):


    bc_customgui = c4d.BaseContainer()
    bc_customgui.SetBool(c4d.BITMAPBUTTON_BUTTON, True)
    # bc_customgui.SetBool(c4d.BITMAPBUTTON_NOBORDERDRAW, False)
    bc_customgui.SetInt32(c4d.BITMAPBUTTON_BORDER, c4d.BORDER_THIN_IN)
    bc_customgui.SetInt32(c4d.BITMAPBUTTON_OUTBORDER, c4d.BORDER_THIN_IN)

    
    bmp_dict = gui.GetIcon(input_v)
    icon_data = c4d.IconData()
    icon_data.bmp = bmp_dict['bmp']
    icon_data.x, icon_data.y, icon_data.w, icon_data.h = bmp_dict['x'], bmp_dict['y'], bmp_dict['w'], bmp_dict['h']
    bmp = icon_data.GetClonePart()
    
    return bmp, bc_customgui

class test_dialog(gui.GeDialog):
    def CreateLayout(self):
        # Other than edit fields, buttons do not have a builtin bubble help.
        self.GroupBegin(1000,c4d.BFH_SCALEFIT|c4d.BFV_SCALEFIT,2,0)
        self.AddButton(1001, c4d.BFH_SCALEFIT, name = "Foo")
        
        
        
        img, bc = LoadCustomIcon(431000053)
        bc.SetString(c4d.BITMAPBUTTON_TOOLTIP, "<b>xxx")
        custom_gui = self.AddCustomGui(1002, c4d.CUSTOMGUI_BITMAPBUTTON,"", c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT, 0, 0, bc)
        custom_gui.SetImage(img)
        self.GroupEnd()
        return True
    """def Message(self,msg,result):
        msg_id = msg.GetId()
        if msg_id == c4d.BFM_GETCURSORINFO:
            result.SetId(c4d.BFM_GETCURSORINFO)
            result.SetString(c4d.RESULT_BUBBLEHELP, "Show something")
            return True
        return c4d.gui.GeDialog.Message(self, msg, result)"""
    def Command(self, id, msg):
        if id == 1002:
            gui.MessageDialog("Click success!")
            return True
        return True


# Execute main()
if __name__=='__main__':


    dlg = test_dialog()

    dlg.Open(c4d.DLG_TYPE_ASYNC,0 -1,-1,400,400)

@ferdinand In the code description in the previous text, it was described as using a right-hand coordinate system, but the Python SDK doc described using a left-hand coordinate system, which I have some doubts about it.

...Cinema 4D uses a right-handed coordinate system....

Hi,

I created a Bitmaobutton GUI, but the GUI only works in the right area of the image, and clicking on the left does not work。
my code:

custom_gui = self.AddCustomGui(ID, c4d.CUSTOMGUI_BITMAPBUTTON, "", c4d.BFH_SCALEFIT, 0, 0, bc)
custom_gui.SetImage(bitmap)

Thanks for any help!

@i_mazlov

@ferdinand Thanks for your reply！

Hi,
There are several XRF objects in the document, and I want to implement the Make it Editable like in the XRF manager or in Object manager.This is the method I used, but the result is incorrect

res = c4d.utils.SendModelingCommand(
                command=c4d.MCOMMAND_MAKEEDITABLE,
                list=xref_objs,
                mode=c4d.MODELINGCOMMANDMODE_ALL,
                bc=c4d.BaseContainer(),
                doc=backup_doc)
for obj in res:
    backup_doc.InsertObject(obj)

Thanks for any help!

Hi @i_mazlov
Through exploring these two pages，page1,page2, I have converted them into Python code Inverse_Bilinear_Interpolation(), which can replace GetPolyPointST(). I am not sure why GetPolyPointST() may obtain incorrect values in certain situations, but Inverse_Bilinear_Interpolation() does not go wrong in complex situations.

video use Inverse_Bilinear_Interpolation()

code:

import math


# algorithm_InverseBilinearInterpolation 逆双线性插值 的算法

def Wedge2D(v:c4d.Vector,w:c4d.Vector):
    return v[0] * w[1] - v[1] * w[0]

def Inverse_Bilinear_Interpolation(p:c4d.Vector,p0:c4d.Vector,p1:c4d.Vector,p3:c4d.Vector,p2:c4d.Vector):

    """
    注意对点顺序的定义
    Attention :  points Order

    p2 --- p3
    |      |
    |      |
    p0 --- p1

    """

    q = p - p0
    b1 = p1 - p0
    b2 = p2 - p0
    b3 = p0 - p1 - p2 + p3

    A = Wedge2D(b2,b3)
    B = Wedge2D(b3,q) - Wedge2D(b1,b2)
    C = Wedge2D(b1,q)
    # 求V - solve v
    if abs(A) < 0.00000001:
        v = -C / B
    else:
        discrim = B * B - 4.0 * A * C
        v = 0.5 * (-B - math.sqrt(discrim)) / A  # CCW
        #v = 0.5 * (-B + math.sqrt(discrim)) / A  # CW

    # 求 u - solve u
    denom = b1 + v * b3

    if abs(denom[0]) > abs(denom[1]):
        u = (q[0] - b2[0] * v) / denom[0]
    else:
        u = (q[1] - b2[1] * v) / denom[1]

    return u,v
# example use CPolygon point position a,b,c,d, and point p in quard(CPolygon)
# u,v = Inverse_Bilinear_Interpolation(p,a,b,c,d)

sample file: custom-quadrilateral.c4d

But for the code part, there are still some doubts about the difference between CCW and CW. When I understand what's going on, I will come back and reply. If any friend can explain, that's the best!