sonist-gtk/ui/image.py

#!/usr/bin/env python3

import gi, cairo, math
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk, GdkPixbuf


class ScaleImage(Gtk.Image):
  def __init__(self, filepath):
    Gtk.Image.__init__(self)
    self.width = None
    self.height = None
    self.reset(filepath)


  def reset(self, filepath, crop = False):
    if type(filepath) == str:
      self.origin = GdkPixbuf.Pixbuf.new_from_file(filepath)
    else:
      self.origin = filepath

    if self.width is None:
      self.pixbuf = self.origin

      self.width = self.origin.get_width()
      self.height = self.origin.get_height()

      self.set_from_pixbuf(self.pixbuf)
    else:
      w = self.origin.get_width()
      h = self.origin.get_height()
      if crop and w != h:
        size = min(self.width, self.height)
        self.clip_resize(size)
      else:
        self.pixbuf = self.origin.scale_simple(self.width, self.height, GdkPixbuf.InterpType.BILINEAR)
        self.set_from_pixbuf(self.pixbuf)
      
    return self


  def resize(self, width, height):
    self.width = width
    self.height = height
    self.pixbuf = self.origin.scale_simple(width, height, GdkPixbuf.InterpType.BILINEAR)
    self.set_from_pixbuf(self.pixbuf)
    return self

  def clip_resize(self, size):
    w = self.origin.get_width()
    h = self.origin.get_height()
    _size = min(w, h) # 按小边裁剪成正方形
    size = min(size, _size) # 缩放按最小值来
    self.width = size
    self.height = size

    surface = cairo.ImageSurface(cairo.Format.ARGB32, w, h)
    ctx = cairo.Context(surface)
    Gdk.cairo_set_source_pixbuf(ctx, self.origin, 0, 0)

    ctx.line_to(0, 0)
    ctx.line_to(_size, 0)
    ctx.line_to(_size, _size)
    ctx.line_to(0, _size)

    ctx.close_path()

    ctx.clip()
    ctx.paint()

    pixbuf = Gdk.pixbuf_get_from_surface(surface, 0, 0, _size, _size)

    self.pixbuf = pixbuf.scale_simple(size, size, GdkPixbuf.InterpType.BILINEAR)
    self.set_from_pixbuf(self.pixbuf)

    return self

  def set_radius(self, radius = 0):
    w = self.width
    h = self.height
    surface = cairo.ImageSurface(cairo.Format.ARGB32, w, h)
    ctx = cairo.Context(surface)
    Gdk.cairo_set_source_pixbuf(ctx, self.pixbuf, 0, 0)

    # 左上角 圆角
    ctx.arc(radius, radius, radius, -math.pi, -math.pi / 2)
    ctx.line_to(w - radius, 0)

    # 右上角 圆角
    ctx.arc(w - radius, radius, radius, -math.pi / 2, 0)
    ctx.line_to(w, -radius)

    # 右下角 圆角
    ctx.arc(w - radius, h - radius, radius, 0, math.pi / 2)
    ctx.line_to(radius, h)

    # 左下角 圆角
    ctx.arc(radius, h - radius, radius, math.pi / 2, math.pi)
    ctx.close_path()

    ctx.clip()
    ctx.paint()

    pixbuf = Gdk.pixbuf_get_from_surface(surface, 0, 0, w, h)
    self.set_from_pixbuf(pixbuf)
    return self


  # 旋转不生效
  def rotate(self, deg = 0, point = None):
    w = self.width
    h = self.height
    surface = cairo.ImageSurface(cairo.Format.ARGB32, w, h)
    ctx = cairo.Context(surface)
    Gdk.cairo_set_source_pixbuf(ctx, self.pixbuf, 0, 0)

    # 圆心坐标
    if point is None:
      point = (w / 2, h / 2)

    ctx.translate(point[0], point[1])
    ctx.rotate((deg / 180) * math.pi)

    ctx.paint()

    pixbuf = Gdk.pixbuf_get_from_surface(surface, 0, 0, w, h)

    self.set_from_pixbuf(pixbuf)
    return self