阅读through some angular component code代码和svg圈子的posts属性设置如下：
r这样可行，所以我只想了解原因？ IIUC [attr.r]="radius - stroke / 2"
属性是svg圆的半径，所以我很好奇为什么不直接使用组件的radius属性？
答案 0 :(得分：0)
您无法绑定到''' Flask Application Factory
Blueprint Flask application using the factory pattern,
with configuration setup and blueprint module registration
'''
from flask import Flask
from flask_bootstrap import Bootstrap
from flask_security import Security
from flask_security import SQLAlchemyUserDatastore
from flask_debugtoolbar import DebugToolbarExtension
from flask_admin import Admin
from flask_admin.contrib.sqla import ModelView
from .models import db
from .models import User
from .models import Role
from .admin import admin
def create_app():
''' create_app
input:
None
output:
app -- flask web application instance
Read configuration values in the following order:
1) default, values which can be overwritten later
2) intance, for your eyes only not stored in repo values
3) environment, selectable values from:
- development
- stagging
- production
Setup web interface with Bootstrap framework
'''
# Initialize app
app = Flask(__name__, instance_relative_config=True)
# Load default config values
app.config.from_object('config.default')
# Load instance config values not stored in repo
app.config.from_pyfile('config.py')
# Load environment config values
app.config.from_envvar('APP_CONFIG_FILE')
# Create database connection
db.init_app(app)
# Instantiate Admin section
admin.init_app(app)
# Initialize bootstrap
Bootstrap(app)
# Setup Flask-Security
security = Security(app, SQLAlchemyUserDatastore(db, User, Role))
# Debug = True to enable the toolbar
toolbar = DebugToolbarExtension(app)
# Load blueprint modules
from application.site.routes import mod as site
from application.api.routes import mod as api
# Register blueprint modules for use
app.register_blueprint(site)
app.register_blueprint(api, url_prefix='/api')
return app
，因为它是属性。 Angular允许您仅直接绑定属性，而不是属性。那么为什么你需要通过r
答案 1 :(得分：0)
属性是svg圆的半径，所以我很好奇为什么不直接使用组件的radius属性？
绘制SVG中的笔划，使其中心跟随路径。因此，对于圆圈，笔划涵盖从radius + stroke/2到radius的区域。
猜测一下，我会说作者希望radius - stroke对应于描边圆的外半径。所以他们减去了一半的笔画宽度。这意味着现在笔划覆盖了从radius到 for X := 0 to srcBitmap.Width-1 do
begin
AlphaScanLine[X] := (OpacityMap[Y][X] shl 24)+FillRGB;
AlphaScanLine[X] := PremultiplyAlpha(AlphaScanLine[X]); // Add this for premultiplied Alpha
end;
的区域。