def svg(self, filename, rect=None, resolution=72.0, paperColor=None): """Create a SVG file for the selected rect or the whole page. The filename may be a string or a QIODevice object. The rectangle is relative to our top-left position. Normally vector graphics are rendered, but in cases where that is not possible, the resolution will be used to determine the DPI for the generated rendering. """ # map to the original page source = self.pageRect() if rect is None else self.mapFromPage().rect( rect) # scale to target size w = source.width() * self.scaleX h = source.height() * self.scaleY if self.computedRotation & 1: w, h = h, w targetSize = QSizeF(w, h) * resolution / self.dpi svg = QSvgGenerator() if isinstance(filename, str): svg.setFileName(filename) else: svg.setOutputDevice(filename) svg.setResolution(int(resolution)) svg.setSize(targetSize.toSize()) svg.setViewBox(QRectF(0, 0, targetSize.width(), targetSize.height())) return self.output(svg, source, paperColor)
def grab_svg(scene): """ Return a SVG rendering of the scene contents. Parameters ---------- scene : :class:`CanvasScene` """ from PyQt5.QtSvg import QSvgGenerator svg_buffer = QBuffer() gen = QSvgGenerator() gen.setOutputDevice(svg_buffer) items_rect = scene.itemsBoundingRect().adjusted(-10, -10, 10, 10) if items_rect.isNull(): items_rect = QRectF(0, 0, 10, 10) width, height = items_rect.width(), items_rect.height() rect_ratio = float(width) / height # Keep a fixed aspect ratio. aspect_ratio = 1.618 if rect_ratio > aspect_ratio: height = int(height * rect_ratio / aspect_ratio) else: width = int(width * aspect_ratio / rect_ratio) target_rect = QRectF(0, 0, width, height) source_rect = QRectF(0, 0, width, height) source_rect.moveCenter(items_rect.center()) gen.setSize(target_rect.size().toSize()) gen.setViewBox(target_rect) painter = QPainter(gen) # Draw background. painter.setBrush(QBrush(Qt.white)) painter.drawRect(target_rect) # Render the scene scene.render(painter, target_rect, source_rect) painter.end() buffer_str = bytes(svg_buffer.buffer()) return buffer_str.decode("utf-8")