Path();
//四个角:右上,右下,左下,左上
path.moveTo(leftTopRadius, 0);
path.lineTo(width - rightTopRadius, 0);
path.quadTo...(width, 0, width, rightTopRadius);
path.lineTo(width, height - rightBottomRadius);
path.quadTo(width,...height, width - rightBottomRadius, height);
path.lineTo(leftBottomRadius, height);
path.quadTo(0, height..., 0, height - leftBottomRadius);
path.lineTo(0, leftTopRadius);
path.quadTo(0, 0, leftTopRadius, 0);