pyaudviz/src/components/image.py

from PIL import Image, ImageDraw, ImageEnhance
from PyQt5 import QtGui, QtCore, QtWidgets
import os

from component import Component
from frame import BlankFrame


class Component(Component):
    '''Image'''

    modified = QtCore.pyqtSignal(int, dict)

    def widget(self, parent):
        self.parent = parent
        self.settings = self.parent.core.settings
        page = self.loadUi('image.ui')

        page.lineEdit_image.textChanged.connect(self.update)
        page.pushButton_image.clicked.connect(self.pickImage)
        page.spinBox_scale.valueChanged.connect(self.update)
        page.spinBox_rotate.valueChanged.connect(self.update)
        page.spinBox_color.valueChanged.connect(self.update)
        page.checkBox_stretch.stateChanged.connect(self.update)
        page.checkBox_mirror.stateChanged.connect(self.update)
        page.spinBox_x.valueChanged.connect(self.update)
        page.spinBox_y.valueChanged.connect(self.update)

        self.page = page
        return page

    def update(self):
        self.imagePath = self.page.lineEdit_image.text()
        self.scale = self.page.spinBox_scale.value()
        self.rotate = self.page.spinBox_rotate.value()
        self.color = self.page.spinBox_color.value()
        self.xPosition = self.page.spinBox_x.value()
        self.yPosition = self.page.spinBox_y.value()
        self.stretched = self.page.checkBox_stretch.isChecked()
        self.mirror = self.page.checkBox_mirror.isChecked()
        self.parent.drawPreview()
        super().update()

    def previewRender(self, previewWorker):
        width = int(self.settings.value('outputWidth'))
        height = int(self.settings.value('outputHeight'))
        return self.drawFrame(width, height)

    def properties(self):
        props = ['static']
        if self.imagePath and not os.path.exists(self.imagePath):
            props.append('error')
        return props

    def error(self):
        if not os.path.exists(self.imagePath):
            return "The image selected on " \
                "layer %s does not exist!" % str(self.compPos)

    def frameRender(self, layerNo, frameNo):
        width = int(self.settings.value('outputWidth'))
        height = int(self.settings.value('outputHeight'))
        return self.drawFrame(width, height)

    def drawFrame(self, width, height):
        frame = BlankFrame(width, height)
        if self.imagePath and os.path.exists(self.imagePath):
            image = Image.open(self.imagePath)

            # Modify image's appearance
            if self.color != 100:
                image = ImageEnhance.Color(image).enhance(
                    float(self.color / 100)
                )
            if self.mirror:
                image = image.transpose(Image.FLIP_LEFT_RIGHT)
            if self.stretched and image.size != (width, height):
                image = image.resize((width, height), Image.ANTIALIAS)
            if self.scale != 100:
                newHeight = int((image.height / 100) * self.scale)
                newWidth = int((image.width / 100) * self.scale)
                image = image.resize((newWidth, newHeight), Image.ANTIALIAS)

            # Paste image at correct position
            frame.paste(image, box=(self.xPosition, self.yPosition))
            if self.rotate != 0:
                frame = frame.rotate(self.rotate)

        return frame

    def loadPreset(self, pr, presetName=None):
        super().loadPreset(pr, presetName)
        self.page.lineEdit_image.setText(pr['image'])
        self.page.spinBox_scale.setValue(pr['scale'])
        self.page.spinBox_color.setValue(pr['color'])
        self.page.spinBox_rotate.setValue(pr['rotate'])
        self.page.spinBox_x.setValue(pr['x'])
        self.page.spinBox_y.setValue(pr['y'])
        self.page.checkBox_stretch.setChecked(pr['stretched'])
        self.page.checkBox_mirror.setChecked(pr['mirror'])

    def savePreset(self):
        return {
            'preset': self.currentPreset,
            'image': self.imagePath,
            'scale': self.scale,
            'color': self.color,
            'rotate': self.rotate,
            'stretched': self.stretched,
            'mirror': self.mirror,
            'x': self.xPosition,
            'y': self.yPosition,
        }

    def pickImage(self):
        imgDir = self.settings.value("componentDir", os.path.expanduser("~"))
        filename, _ = QtWidgets.QFileDialog.getOpenFileName(
            self.page, "Choose Image", imgDir,
            "Image Files (%s)" % " ".join(self.core.imageFormats))
        if filename:
            self.settings.setValue("componentDir", os.path.dirname(filename))
            self.page.lineEdit_image.setText(filename)
            self.update()

    def command(self, arg):
        if not arg.startswith('preset=') and '=' in arg:
            key, arg = arg.split('=', 1)
            if key == 'path' and os.path.exists(arg):
                try:
                    Image.open(arg)
                    self.page.lineEdit_image.setText(arg)
                    self.page.checkBox_stretch.setChecked(True)
                    return
                except OSError as e:
                    print("Not a supported image format")
                    quit(1)
        super().command(arg)

    def commandHelp(self):
        print('Load an image:\n    path=/filepath/to/image.png')