def zoom_in(self):
if self._zoom <= 0.33:
self._zoom += 0.33
elif self._zoom <= 0.5:
self._zoom += 0.5
else:
self._zoom += 1
self.set_transform()
self.strokeWidth = 1 / self._zoom
self.cursorSize = 2 / self._zoom
self.move_cursor(self._last_cursor_pos)
if not self._do_drawing:
window.requestAnimationFrame(self.draw)
def zoom_out(self):
if self._zoom > 1:
self._zoom -= 1
elif self._zoom > 0.5:
self._zoom -= 0.5
elif self._zoom > 0.33:
self._zoom -= 0.33
self.set_transform()
#self.strokeWidth = 0.25 if self._zoom > 1 else 1
self.strokeWidth = 1 / self._zoom
self.cursorSize = 2 / self._zoom
self.move_cursor(self._last_cursor_pos)
if not self._do_drawing:
window.requestAnimationFrame(self.draw)
def draw(self):
if self._do_drawing:
window.requestAnimationFrame(self.draw)
self.ctx.setTransform(1, 0, 0, 1, 0, 0)
self.ctx.clearRect(0, 0, self.ctx.canvas.width, self.ctx.canvas.height)
self.set_transform()
self.ctx.lineWidth = self.strokeWidth
self.ctx.lineCap = self.lineCap
self.ctx.strokeStyle = self.strokeColor
if self._line_paths:
self.ctx.stroke(self._line_paths)
self.ctx.fillStyle = self.cursorColor
if self._cursor_paths:
self.ctx.fill(self._cursor_paths)
def move(self, x, y):
self._position = (self._mouse_down_position[0] + x,
self._mouse_down_position[1] + y)
self.set_transform()
if not self._do_drawing:
window.requestAnimationFrame(self.draw)
def clear(self):
self._line_paths = []
self._cursor_paths = []
if not self._do_drawing:
window.requestAnimationFrame(self.draw)
def start_drawing(self):
if not self._do_drawing:
self._do_drawing = True
window.requestAnimationFrame(self.draw)
def force_redraw(self):
if not self._do_drawing:
window.requestAnimationFrame(self.draw)