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IronPython:创建点数组并将其添加到GraphicsPath

graphicspath point ironpython arrays

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ClockEndGooner · 技术社区 · 15 年前

问候语;

我在正确地实例化系统图点实例,然后在WinForms应用程序中使用IronPython将点数组添加到GDI+GraphicsPath实例。以下代码在SharpDevelop 3.2和IronPython 2.6下正确编译或构建:

import System.Drawing
import System.Drawing.Drawing2D 
import System.Windows.Forms

from System import Array 
from System.Drawing import Pen, Point
from System.Drawing.Drawing2D import GraphicsPath, CustomLineCap
from System.Windows.Forms import *

class MainForm(Form):
    def __init__(self):
        self.InitializeComponent()

    def InitializeComponent(self):
        self.SuspendLayout()
        # 
        # MainForm
        # 
        self.ClientSize = System.Drawing.Size(284, 264)
        self.Name = "MainForm"
        self.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        self.Text = "GDI Lines"
        self.Paint += self.MainFormPaint
        self.ResumeLayout(False)

    def MainFormPaint(self, sender, e):
        graphicContext = e.Graphics
        bluePen = Pen(Color.Blue, 1)

        points = Array.CreateInstance(Point, 9)
        points[0] = Point(10, 10)
        points[1] = Point(15, 10)
        points[2] = Point(20, 15)
        points[3] = Point(20, 20)
        points[4] = Point(15, 25)
        points[5] = Point(10, 25)
        points[6] = Point(5, 20)
        points[7] = Point(5, 15)
        points[8] = Point(10, 10)

        graphicsPath = GraphicsPath()
        graphicsPath.AddLines(points)
        graphicContext.SmoothingMode = SmoothingMode.AntiAlias

        lineCap = CustomLineCap(nil, graphicsPath)
        lineCap.BaseInset = 0
        lineCap.WidthScale = 1
        lineCap.StrokeJoin = LineJoin.Miter

        bluePen.CustomStartCap = lineCap
        bluePen.CustomEndCap = lineCap

        graphicContext.DrawLine(bluePen, 50, 150, 200, 150)
        graphicContext.DrawLine(bluePen, 150, 50, 150, 200)

        lineCap.Dispose()
        graphicsPath.Dispose()
        bluePen.Dispose()

基于上面的代码,我期望看到绘制两条perpendicualr蓝色线,每行的末尾都有一个小椭圆。使用上面的当前剪切代码,将绘制GDI+运行时错误red X。我遗漏了什么或做错了什么?此外,是否有更简单或更简洁的方法来实例化系统图点价值观?

提前感谢您的时间和帮助。。。

1 回复 | 直到 15 年前

1

ClockEndGooner 14 年前

公平地说,我必须说,我没有“回答我自己的问题”,也没有独自解决这个问题,而是能够得到马特·沃德和迈克尔·福德两人的外部帮助。我衷心感谢马特和迈克尔的时间,帮助和耐心,我真的很感谢他们回信更正。

主要问题是主窗体.py运行中的脚本是我从系统图命名空间,以及来自系统图.Drawing2D命名空间。尽管我的脚本没有直接实例化任何其他枚举或类,但它们仍然必须由.NET DLR从各自的程序集中加载和引用,以使它们在我的脚本中可访问和使用。(注:再次感谢马特向我指出这一点;如果解释中有任何错误,那是我的,而不是马特的。)

GDI+点实例的原始数组实例化是正确的,但在下面的更正脚本中显示了更简洁的方法。(注意:再次感谢Michael指出了数组实例化的替代方法。)

正确的和有效的主窗体.py脚本如下:

import System.Drawing
import System.Drawing.Drawing2D 
import System.Windows.Forms

from System import Array 
from System.Drawing import Pen, Point, Color
from System.Drawing.Drawing2D import GraphicsPath, CustomLineCap, SmoothingMode, LineJoin
from System.Windows.Forms import *

class MainForm(Form):
    def __init__(self):
        self.InitializeComponent()

    def InitializeComponent(self):
        self.SuspendLayout()
        # 
        # MainForm
        # 
        self.ClientSize = System.Drawing.Size(284, 264)
        self.Name = "MainForm"
        self.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        self.Text = "GDI+ CustomLineCaps"
        self.Paint += self.MainFormPaint
        self.ResumeLayout(False)

    def MainFormPaint(self, sender, e):
        graphics = e.Graphics
        bluePen = Pen(Color.Blue, 1)

        points = Array[Point] \
        ((Point(10, 10), Point(15, 10), Point(20, 15), \
          Point(20, 20), Point(15, 25), Point(10, 25), \
          Point(5, 20),  Point(5, 15),  Point(10, 10)))

        graphicsPath = GraphicsPath()
        graphicsPath.AddLines(points)
        graphics.SmoothingMode = SmoothingMode.AntiAlias 

        lineCap = CustomLineCap(None, graphicsPath)
        lineCap.BaseInset = 0
        lineCap.WidthScale = 1
        lineCap.StrokeJoin = LineJoin.Miter 

        bluePen.CustomStartCap = lineCap
        bluePen.CustomEndCap = lineCap

        graphics.DrawLine(bluePen, 50, 150, 200, 150)
        graphics.DrawLine(bluePen, 150, 50, 150, 200)

        lineCap.Dispose()
        graphicsPath.Dispose()
        bluePen.Dispose()