krita-plugins/card_grid_generator/card_grid_generator_extension.py

from krita import Extension
from PyQt5.QtWidgets import QDialog, QVBoxLayout, QHBoxLayout, QLabel, QLineEdit, QComboBox, QCheckBox, QPushButton
from PyQt5.QtCore import Qt, QByteArray
from math import floor

class CardGridGenerator(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("cardgridgen", "Card Grid Generator")
        action.triggered.connect(self.card_grid_generator)

    def card_grid_generator(self):
        # Dialog creation.
        newDialog = QDialog()
        newDialog.setWindowTitle("Card Grid Generator")
        layout = QVBoxLayout()
        newDialog.setLayout(layout)


        # Description row.
        desc = QLabel('Creates a grid of guides and cropmarks for a given card size.')
        desc.setAlignment(Qt.AlignCenter)
        row0 = QHBoxLayout()
        row0.addWidget(desc)
        layout.addLayout(row0)

        # Card dimension row.
        self.widthInput = QLineEdit('750')
        self.heightInput = QLineEdit('1050')
        self.unitInput = QComboBox()
        self.unitInput.addItems( ['px', 'mm', 'inch'] )
        row1 = QHBoxLayout()
        row1.addWidget(QLabel('Card size: W:'))
        row1.addWidget(self.widthInput)
        row1.addWidget(QLabel(' x H:'))
        row1.addWidget(self.heightInput)
        row1.addWidget(self.unitInput)
        layout.addLayout(row1)

        # Bleed dimension row. Also, guides or cropmarks selection.
        self.bleedInput = QLineEdit('36')
        self.guidesCheck = QCheckBox('Guides')
        self.guidesCheck.setChecked(True)
        self.cropmarksCheck = QCheckBox('Cropmarks')
        self.cropmarksCheck.setChecked(True)
        row2 = QHBoxLayout()
        row2.addWidget(QLabel('Bleed size:'))
        row2.addWidget(self.bleedInput)
        row2.addWidget(self.guidesCheck)
        row2.addWidget(self.cropmarksCheck)
        layout.addLayout(row2)

        # How many cards row.
        self.rowsInput = QLineEdit('0')
        self.colsInput = QLineEdit('0')
        self.maxCheck = QCheckBox('Max Possible')
        self.maxCheck.setChecked(True)
        row3 = QHBoxLayout()
        row3.addWidget(QLabel('Grid: Columns:'))
        row3.addWidget(self.colsInput)
        row3.addWidget(QLabel('Rows:'))
        row3.addWidget(self.rowsInput)
        row3.addWidget(self.maxCheck)
        layout.addLayout(row3)

        # Do It row.
        goButton = QPushButton("Create Card Grid")
        goButton.setIcon( Krita.instance().icon('animation_play') )
        row4 = QHBoxLayout()
        row4.addWidget(goButton)
        layout.addLayout(row4)

        # Hook up the actions.
        goButton.clicked.connect( self.generateCardGrid )

        # Show the dialog.
        newDialog.exec_()


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

    # Actually generates the card grid!
    def generateCardGrid(self, e):

        doc = Krita.instance().activeDocument()

        # If there is no open document, create a new one (A4 300ppi).
        if not doc:
            doc = Krita.instance().createDocument(3508, 2480, "Card Grid", "RGBA", "U8", "", 300.0)
            Krita.instance().activeWindow().addView(doc)

        # Document dimensions.
        docWidth = doc.width()
        docHeight = doc.height()

        # Card dimensions.
        multiplier = 1
        docPPI = doc.resolution()
        if self.unitInput.currentText() == "inch":
            multiplier = docPPI
        if self.unitInput.currentText() == "mm":
            multiplier = docPPI/25.4
        bleedSize = float(self.bleedInput.text()) * multiplier
        cardWidth = float(self.widthInput.text()) * multiplier
        cardHeight = float(self.heightInput.text()) * multiplier

        # Card dimensions with bleed.
        cardBledWidth = cardWidth + bleedSize * 2
        cardBledHeight = cardHeight + bleedSize * 2

        # Determine layout.
        colCount = 0
        rowCount = 0
        if self.maxCheck.checkState():
            # Create the maximum-possible card layout
            colCount = floor(docWidth / cardBledWidth)
            rowCount = floor(docHeight / cardBledHeight)
        else:
            # Create card layout according to user specified rows and columns.
            colCount = int(self.colsInput.text())
            rowCount = int(self.rowsInput.text())

        # Calculate offset for centering.
        # Remainder pixels of row and column, divide by 2.
        # Bias odd pixel calculations to top left via floor.
        widthOffset = floor((docWidth - colCount * cardBledWidth) / 2)
        heightOffset = floor((docHeight - rowCount * cardBledHeight) / 2)

        # Create xSet and ySet (remember, both bleed + edge dimensions).
        # Also create Cards-Only sets for cropmarks.
        xSet = [widthOffset]
        ySet = [heightOffset]
        xSetCardsOnly = []
        ySetCardsOnly = []

        for i in range(colCount):
            base = widthOffset + i * cardBledWidth
            bleed1 = base + bleedSize
            card = bleed1 + cardWidth
            bleed2 = card + bleedSize
            # Cut down the number of guides if there is no bleed.
            xSet += [bleed1, card, bleed2] if bleedSize > 0 else [card]
            xSetCardsOnly += [bleed1, card] if bleedSize > 0 else [card]

        for i in range(rowCount):
            base = heightOffset + i * cardBledHeight
            bleed1 = base + bleedSize
            card = bleed1 + cardHeight
            bleed2 = card + bleedSize
            # Cut down the number of guides if there is no bleed.
            ySet +=[bleed1, card, bleed2] if bleedSize > 0 else [card]
            ySetCardsOnly += [bleed1, card] if bleedSize > 0 else [card]

        xSet.sort()
        ySet.sort()

        # Create guides. dump xSet ySet into guide functions.
        if self.guidesCheck.checkState():
            vList = doc.verticalGuides()
            hList = doc.horizontalGuides()
            vList.clear()
            hList.clear()
            doc.setVerticalGuides(xSet)
            doc.setHorizontalGuides(ySet)
            doc.setGuidesLocked(True)
            doc.setGuidesVisible(True)

        # Create cropmarks.
        if self.cropmarksCheck.checkState():

            # Cropmarks will be on a new layer.
            layer = doc.createNode('CardGridCropmarks', 'paintLayer')
            root = doc.rootNode()
            root.addChildNode(layer, None)

            # Create vertical cropmarks.
            blackPixel = b'\x00\x00\x00\xff'
            cropMarkWidth = 2
            cropMarkHeight = 48
            cropMark = QByteArray(blackPixel * cropMarkWidth * cropMarkHeight)
            for x in xSetCardsOnly:
                # top
                y = ySet[0] - cropMarkHeight
                layer.setPixelData(cropMark, x - 1, y, cropMarkWidth, cropMarkHeight)
                # bottom
                layer.setPixelData(cropMark, x - 1, ySet[-1], cropMarkWidth, cropMarkHeight)

            # Create horizontal cropmarks.
            cropMarkWidth = 48
            cropMarkHeight = 2
            cropMark = QByteArray(blackPixel * cropMarkWidth * cropMarkHeight)
            for y in ySetCardsOnly:
                # left
                x = xSet[0] - cropMarkWidth
                layer.setPixelData(cropMark, x, y - 1, cropMarkWidth, cropMarkHeight)
                # right
                layer.setPixelData(cropMark, xSet[-1], y - 1, cropMarkWidth, cropMarkHeight)

            # Refresh the view, or the cropmarks will not be immediately shown.
            doc.refreshProjection()