wxPython之wx.DC绘制形状_wxpython 增加边框-优快云博客

绘制形状

除了绘制文本和位图，DC也可以绘制任意的形状和线。这允许我们完全自定义窗口部件和控件的外观。

示例说明

利用PaintDC创建一个简单笑脸控件。

#-*-coding: UTF-8 -*-
#------------------------------------------------------
#Purpose: nothing....

#Author: 阿Bin先生
#Created: 2017年5月21日
#------------------------------------------------------
import wx

class Smiley(wx.PyControl):
    def __init__(self, parent, size=(100, 100)):
        super(Smiley, self).__init__(parent,
        size=size,
        style=wx.NO_BORDER)
        # Event Handlers
        self.Bind(wx.EVT_PAINT, self.OnPaint)

    def OnPaint(self, event):
        """Draw the image on to the panel"""
        dc = wx.PaintDC(self) # Must create a PaintDC
        # Get the working rectangle we can draw in
        rect = self.GetClientRect()
        # Setup the DC
        dc.SetPen(wx.BLACK_PEN) # for drawing lines / borders
        yellowbrush = wx.Brush(wx.Colour(255, 255, 0))
        dc.SetBrush(yellowbrush) # Yellow fill

        cx = (rect.width / 2) + rect.x
        cy = (rect.width / 2) + rect.y
        radius = min(rect.width, rect.height) / 2
        dc.DrawCircle(cx, cy, radius)
        eyesz = (rect.width / 8, rect.height / 8)
        eyepos = (cx / 2, cy / 2)
        dc.SetBrush(wx.BLUE_BRUSH)
        dc.DrawRectangle(eyepos[0], eyepos[1],
        eyesz[0], eyesz[1])
        eyepos = (eyepos[0] + (cx - eyesz[0]), eyepos[1])
        dc.DrawRectangle(eyepos[0], eyepos[1],
        eyesz[0], eyesz[1])
        dc.SetBrush(yellowbrush)
        startpos = (cx / 2, (cy / 2) + cy)
        endpos = (cx + startpos[0], startpos[1])
        dc.DrawArc(startpos[0], startpos[1],
        endpos[0], endpos[1], cx, cy)
        dc.SetPen(wx.TRANSPARENT_PEN)
        dc.DrawRectangle(startpos[0], cy,
        endpos[0] - startpos[0],
        startpos[1] - cy)

class MyFrame(wx.Frame):
    def __init__(self, parent, *args, **kwargs):
        super(MyFrame, self).__init__(parent, *args, **kwargs)
        # Attributes
        self.Panel = wx.Panel(self)
        Smiley(self.Panel)

class MyApp(wx.App):
    def OnInit(self):
        self.frame = MyFrame(None, title="DrawShapes",size = [500, 500])
        self.SetTopWindow(self.frame)
        self.frame.Show()
        return True

if __name__ == "__main__":
    app = MyApp(False)
    app.MainLoop()

运行结果：

这里写图片描述

示例分析

　　　DC的SetPen用来绘制线条和形状的边框。DC的SetBrush用来填充颜色。首先使用DCdeDrawCircle绘制一个黑色边框的黄色圆，表示头。然后使用DrawRectangle方法绘制蓝色矩形，表示眼睛。最后使用DC的DrawArch方法绘制扇形，因为只想用圆弧来表示微笑，所以用矩形覆盖圆弧两端的两条半径线。