determine centerpoint in irregular rectangle / create "composition"

mrrouge

Hi Iam still learning the basics and i have a new problem !

I drew a rectangle using lineTo commands and curveTo commands
and I managed to center it but I wanted to ask if there is a way to treat the 4 commands more like a group or rect without loosing the ability to control the handles.

the only solution i found was to return a distance value for each point

thanks a lot

regards david

for i in range(1) :
    newPage (5000,5000)
    xMiddle, yMiddle = 2500, 2500  # mitte 
    
    stroke(0)
    fill(0)
    
     
    
    
    
    
    translate(xMiddle, yMiddle)
   

    
    
        
    for i in range(1): #Body
        translate (-450,450)
        stroke()
        
                # create a new empty path
        newPath()
        # set the first oncurve point
        moveTo((-0, -0))
        # line to from the previous point to a new point
        curveTo((74, -362), (-106, -360),(-0, -900))
        lineTo((900, -900))
        curveTo((162, -290), (450, -292),(900,-0))
        
        

        # curve to a point with two given handles

        # close the path
        closePath()
        # draw the path
        drawPath()

gferreira

hello David,

rect(), oval(), etc are regular Python functions. you can create a new shape that behaves the same way by defining a new ‘shape drawing function’ that takes the same arguments (x, y, w, h).

here’s an example:

def myShape(x, y, w, h):
    save()
    translate(x, y)
    scale(w, h)
    newPath()
    moveTo((0., 0.0))
    lineTo((1.0, 0.0))
    curveTo((0.7, 0.3), (0.7, 0.7), (1.0, 1.0))
    lineTo((0, 1.0))
    closePath()
    drawPath()
    restore()

newPage(500, 500)

xMiddle = width()/2
yMiddle = height()/2

shapeWidth, shapeHeight = 354, 242

shapeX = xMiddle - shapeWidth/2
shapeY = yMiddle - shapeHeight/2

myShape(shapeX, shapeY, shapeWidth, shapeHeight)

notice that the (x,y) point positions are now defined as decimal numbers between 0.0 and 1.0, which are then scaled by the given width & height.

mrrouge

@gferreira said in determine centerpoint in irregular rectangle / create "composition":

def myShape(x, y, w, h):
save()
translate(x, y)
scale(w, h)
newPath()
moveTo((0., 0.0))
lineTo((1.0, 0.0))
curveTo((0.7, 0.3), (0.7, 0.7), (1.0, 1.0))
lineTo((0, 1.0))
closePath()
drawPath()
restore()

newPage(500, 500)

xMiddle = width()/2
yMiddle = height()/2

shapeWidth, shapeHeight = 354, 242

shapeX = xMiddle - shapeWidth/2
shapeY = yMiddle - shapeHeight/2

myShape(shapeX, shapeY, shapeWidth, shapeHeight)

Thanks Mister Ferreira
for your quick and detailed answer

can I ask you why suddenly everything is now in decimal numbers ?
this is the only thing i didnt really understand

Best regards David

gferreira

can I ask you why suddenly everything is now in decimal numbers ?

think of it as percentages: the x/y point coordinates are defined in relation to the width/height dimensions of the shape, which are variable.

ps. width/height were used as scale factors – not the best implementation in hindsight, because it also scales the stroke width. this (below) is better, and maybe makes the percentages explanation clearer:

def myShape(x, y, w, h):
    save()
    translate(x, y)
    newPath()
    moveTo((0.0*w, 0.0*h))
    lineTo((1.0*w, 0.0*h))
    curveTo((0.7*w, 0.3*h), (0.7*w, 0.7*h), (1.0*w, 1.0*h))
    lineTo((0*w, 1.0*h))
    closePath()
    drawPath()
    restore()

cheers!

mrrouge

thanks

@}->--