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import wx
import skia
import moderngl
from wx import glcanvas
GL_RGBA8 = 0x8058
class DrawCanvas(glcanvas.GLCanvas):
def __init__(self, parent, size):
glcanvas.GLCanvas.__init__(self, parent, -1, size=size)
self.size = None
self.init = False
self.ctx = None
self.glcanvas = glcanvas.GLContext(self)
self.size = (800, 800)
self.x_pos = 0
self.y_pos = 0
self.Bind(wx.EVT_SIZE, self.OnSize)
self.Bind(wx.EVT_PAINT, self.OnPaint)
def OnEraseBackground(self, event):
pass # Do nothing, to avoid flashing on MSW.
def OnSize(self, event):
wx.CallAfter(self.DoSetViewport)
event.Skip()
def DoSetViewport(self):
# Set the viewport size
self.size = self.GetClientSize()
self.SetCurrent(self.glcanvas)
if not self.ctx is None:
self.ctx.set_viewport(0, 0, self.Size.width, self.Size.height)
def InitGL(self):
# Initialize the skia context with the moderngl context
self.ctx = moderngl.create_context()
context = skia.GrDirectContext.MakeGL()
backend_render_target = skia.GrBackendRenderTarget(
self.size[0],
self.size[1],
0, # sampleCnt
0, # stencilBits
skia.GrGLFramebufferInfo(0, GL_RGBA8))
self.surface = skia.Surface.MakeFromBackendRenderTarget(
context, backend_render_target, skia.kBottomLeft_GrSurfaceOrigin,
skia.kRGBA_8888_ColorType, skia.ColorSpace.MakeSRGB())
self.canvas = self.surface.getCanvas()
def OnPaint(self, event):
dc = wx.PaintDC(self)
self.SetCurrent(self.glcanvas)
if not self.init:
self.InitGL()
self.init = True
self.OnDraw()
def OnDraw(self):
self.SetContextViewport(0, 0, self.Size.width, self.Size.height)
self.ctx.clear(255.0, 255.0, 255.0, 0.0)
self.DrawContext()
self.SwapBuffers()
def DrawContext(self):
# Do your drawing with skia here
paint = skia.Paint(Color=skia.ColorGREEN)
paint.setAntiAlias(True)
self.canvas.drawCircle(self.x_pos, self.y_pos, 40, paint)
self.canvas.drawSimpleText("Hello ModernGL, Skia & wxPython!", 90, 200,
skia.Font(skia.Typeface("Arial"), 40),
skia.Paint(Color=skia.ColorBLUE))
self.surface.flushAndSubmit()
def SetContextViewport(self, x, y, width, height):
self.ctx.viewport = (x, y, width, height)
def SetXPos(self, x_pos):
self.x_pos = x_pos
self.Refresh(False)
def SetYPos(self, y_pos):
self.y_pos = y_pos
self.Refresh(False)
class Frame(wx.Frame):
def __init__(self, parent, title):
super(Frame, self).__init__(parent, title=title, size=(900, 800))
self.SetBackgroundColour(wx.Colour("#eee"))
main_sz = wx.BoxSizer(wx.HORIZONTAL)
sz = wx.BoxSizer(wx.VERTICAL)
panel = wx.Panel(self)
panel.SetBackgroundColour(wx.Colour("#eee"))
self.canvas = DrawCanvas(panel, size=(800, 800))
self.slider_y = wx.Slider(self, 100, 25, 1, 800, size=(50, -1),
style=wx.SL_VERTICAL)
self.slider_x = wx.Slider(panel, 100, 25, 1, 800, size=(50, -1),
style=wx.SL_HORIZONTAL)
panel.SetSizer(sz)
sz.Add(self.slider_x, 0, flag=wx.EXPAND|wx.ALL)
sz.Add(self.canvas, 0, flag=wx.EXPAND|wx.ALL)
main_sz.Add(self.slider_y, 0, flag=wx.EXPAND|wx.ALL)
main_sz.Add(panel, 0, flag=wx.EXPAND|wx.ALL)
self.SetSizer(main_sz)
self.slider_x.Bind(wx.EVT_SLIDER, self.OnChangeX)
self.slider_y.Bind(wx.EVT_SLIDER, self.OnChangeY)
self.Center()
def OnChangeX(self, event):
self.canvas.SetXPos(self.slider_x.GetValue())
event.Skip()
def OnChangeY(self, event):
self.canvas.SetYPos(self.slider_y.GetValue())
event.Skip()
ex = wx.App()
win = Frame(None, "ModernGL + Skia Python + wxPython")
win.Show(True)
ex.MainLoop()
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