krita-plugins/box_generator/box_generator_extension.py

from krita import *
from PyQt5.QtWidgets import QDialog, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QComboBox, QCheckBox, QPushButton
from PyQt5.QtCore import *

class BoxGenerator(Extension):

    def __init__(self, parent):
        super().__init__(parent)

    # Krita.instance() exists, so do any setup work
    def setup(self):
        pass

    # called after setup(self)
    def createActions(self, window):
        # Create menu item in Tools > Scripts.
        action = window.createAction("boxgen", "Box Generator")
        action.triggered.connect(self.box_generator)

    def box_generator(self):
        # Get the current selected layer, called a 'node'
        self.doc = Krita.instance().activeDocument()

        if not self.doc:
            # Create and show a new document (A4 300ppi).
            self.doc = Krita.instance().createDocument(3508, 2480, "", "RGBA", "U8", "", 300.0)
            Krita.instance().activeWindow().addView(self.doc)

        # Dialog creation.
        newDialog = QDialog()
        newDialog.setWindowTitle("Box Generator")

        # Description row.
        desc = QLabel('Creates outlines for a foldable box with lid.')
        desc.setAlignment(Qt.AlignCenter)
        row0 = QHBoxLayout()
        row0.addWidget(desc)

        # Dimension row.
        self.lengthInput = QLineEdit('67')
        self.widthInput = QLineEdit('93')
        self.heightInput = QLineEdit('20')
        self.unitInput = QComboBox()
        self.unitInput.addItems( ['mm', 'inch', 'px'] )
        row1 = QHBoxLayout()
        row1.addWidget(QLabel('Dimensions: L:'))
        row1.addWidget(self.lengthInput)
        row1.addWidget(QLabel(' x W:'))
        row1.addWidget(self.widthInput)
        row1.addWidget(QLabel(' x H:'))
        row1.addWidget(self.heightInput)
        row1.addWidget(self.unitInput)

        # Decision row.
        self.boxTypeInput = QComboBox()
        self.boxTypeInput.addItems( ['Tuckbox', 'Telescopic'] )
        row2 = QHBoxLayout()
        row2.addWidget(QLabel('Box Type:'))
        row2.addWidget(self.boxTypeInput)

        # Do It row.
        goButton = QPushButton("Create Box")
        goButton.setIcon( Krita.instance().icon('animation_play') )
        row3 = QHBoxLayout()
        row3.addWidget(goButton)

        layoutMain = QVBoxLayout()
        layoutMain.addLayout(row0)
        layoutMain.addLayout(row1)
        layoutMain.addLayout(row2)
        layoutMain.addLayout(row3)
        newDialog.setLayout(layoutMain)

        # hook up the actions.
        goButton.clicked.connect( self.generateBox )
        # self.unitInput.currentIndexChanged.connect( self.convertCount )

        # show the dialog.
        newDialog.exec_()


    ##########
    # Slots
    ##########

    # Actually generates the box!
    def generateBox(self, e):
        layer = self.doc.createVectorLayer("Box")
        root = self.doc.rootNode()
        root.addChildNode(layer, None)

        # Get dimensions in points. Points to mm conversion depends on document DPI.
        length_mm = float(self.lengthInput.text())
        width_mm = float(self.widthInput.text())
        height_mm = float(self.heightInput.text())
        # Assume input is in mm.
        pts_per_mm = 300 / 25.4
        length = length_mm * pts_per_mm
        height = height_mm * pts_per_mm
        width = width_mm * pts_per_mm

        # Create outline using SVG.
        if self.boxTypeInput.currentIndex() == 0: # Tuckbox
            total_length = length * 2 +  height * 3
            total_width = width +  height * 3
            leeway = pts_per_mm / 2 # Make certain flaps shorter by 0.5mm to account for paper thickness.
            
            stringy = f"""<svg style="stroke:black; fill:none; stroke-width:1">
                <path d="
                m {pts_per_mm+height*1.66}
                h {length-height*2*0.66}
                a {height*0.66} {height*0.66} 0 0 1 {height*0.66} {height*0.66}
                v {height}
                l {height*0.1} -{height}
                h {height*0.4}
                a {height*0.5} {height} 0 0 1 {height*0.5} {height}
                h {length+height-leeway}
                v {width}
                h -{height-leeway}
                v {height-leeway}
                h -{length}
                v -{height-leeway}
                l -{height*0.1} {height}
                h -{height*0.8}
                l -{height*0.1} -{height}
                v {height}
                h -{length}
                v -{height}
                l -{height*0.1} {height}
                h -{height*0.8}
                l -{height*0.1} -{height}
                v -{width}
                a {height*0.5} {height} 0 0 1 {height*0.5} -{height}
                h {height*0.4}
                l {height*0.1} {height}
                v -{height}
                a {height*0.66} {height*0.66} 0 0 1 {height*0.66} -{height*0.66}
                z
                "></path>
                <path d="
                M {pts_per_mm+height} {height*0.66}
                h -{pts_per_mm}
                M {pts_per_mm+height+length} {height*0.66}
                h {pts_per_mm}
                M 0 {height*1.66}
                h {pts_per_mm}
                M 0 {height*1.66+width}
                h {pts_per_mm}
                M {pts_per_mm+height*2+length*2} {height*1.66}
                v -{pts_per_mm}
                "></path>
                </svg>"""

        else: # Telescopic
            total_length = length + 5 * height
            total_width = width + 5 * height
            stringy = f"""<svg width="{total_length}" height="{total_width}" style="stroke:black; fill:none; stroke-width:1">
                <path d="
                m {height*3}
                h {length-height}
                l {height/2} {height/2}
                v {height}
                a {height} {height} 0 0 1 {height} {height}
                h {height}
                l {height/2} {height/2}
                v {width-height}
                l -{height/2} {height/2}
                h -{height}
                a {height} {height} 0 0 1 -{height} {height}
                v {height}
                l -{height/2} {height/2}
                h -{length-height}
                l -{height/2} -{height/2}
                v -{height}
                a {height} {height} 0 0 1 -{height} -{height}
                h -{height}
                l -{height/2} -{height/2}
                v -{width-height}
                l {height/2} -{height/2}
                h {height}
                a {height} {height} 0 0 1 {height} -{height}
                v -{height}
                Z
                "></path>
                </svg>"""

        layer.addShapesFromSvg(stringy)