Merge pull request #210 from khchen/master

add examples/realtime_wnim.nim

examples/realtime_wnim.nim

@@ -0,0 +1,70 @@
+import pixie, wNim/[wApp, wFrame, wPaintDC, wImage]
+
+let
+  w = 256
+  h = 256
+
+var
+  screen = newImage(w, h)
+  ctx = newContext(screen)
+  frameCount = 0
+  image = Image(w, h)
+  app = App()
+  frame = Frame()
+
+proc draw() =
+  # draw shiny sphere on gradient background
+  var linerGradient = Paint(kind: pkGradientLinear)
+  linerGradient.gradientHandlePositions.add(vec2(0, 0))
+  linerGradient.gradientHandlePositions.add(vec2(0, 256))
+  linerGradient.gradientStops.add(
+    ColorStop(color: rgbx(0, 0, 0, 255), position: 0))
+  linerGradient.gradientStops.add(
+    ColorStop(color: rgbx(255, 255, 255, 255), position: 1))
+  ctx.fillStyle = linerGradient
+  ctx.fillRect(0, 0, 256, 256)
+
+  var radialGradient = Paint(kind: pkGradientRadial)
+  radialGradient.gradientHandlePositions.add(vec2(128, 128))
+  radialGradient.gradientHandlePositions.add(vec2(256, 128))
+  radialGradient.gradientHandlePositions.add(vec2(128, 256))
+  radialGradient.gradientStops.add(
+    ColorStop(color: rgbx(255, 255, 255, 255), position: 0))
+  radialGradient.gradientStops.add(
+    ColorStop(color: rgbx(0, 0, 0, 255), position: 1))
+  ctx.fillStyle = radialGradient
+  ctx.fillCircle(vec2(128.0, 128.0 + sin(float(frameCount)/10.0) * 20), 76.8)
+
+  inc frameCount
+
+proc render() =
+
+  proc GdipCreateBitmapFromScan0(width: cint, height: cint, stride: cint,
+    format: cint, scan0: pointer, bitmap: pointer): cint
+    {.stdcall, discardable, dynlib: "gdiplus", importc.}
+
+  proc GdipDisposeImage(image: pointer): cint
+    {.stdcall, discardable, dynlib: "gdiplus", importc.}
+
+  const PixelFormat32bppARGB = 2498570
+
+  GdipDisposeImage(image.mGdipBmp)
+
+  GdipCreateBitmapFromScan0(cint w, cint h, cint w * 4,
+    PixelFormat32bppARGB, ctx.image.data[0].addr, addr image.mGdipBmp)
+
+frame.clientSize = (w, h)
+
+frame.startTimer(0.01)
+
+frame.wEvent_Timer do ():
+  draw()
+  render()
+  frame.refresh(false)
+
+frame.wEvent_Paint do ():
+  var dc = PaintDC(frame)
+  dc.drawImage(image)
+
+frame.show()
+app.mainLoop()