public SimpleCanvas(int view_width, int view_height)
{
FillColor = Color.Black;
StrokeColor = Color.Black;
//dimension
_view_width = view_width;
_view_height = view_height;
_max = Math.Max(view_width, view_height);
//------------
//matrix
////square viewport
_orthoView = MyMat4.ortho(0, _max, 0, _max, 0, 1);
_flipVerticalView = MyMat4.scale(1, -1) * MyMat4.translate(new OpenTK.Vector3(0, -_max, 0));
_orthoAndFlip = _orthoView * _flipVerticalView;
//-----------------------------------------------------------------------
//shader
_shaderRes = new CanvasToShaderSharedResource();
_shaderRes.OrthoView = _orthoView;
//
_fillShader = new GlyphFillShader(_shaderRes);
//------------
//tools
Tesselate.Tesselator tt = new Tesselate.Tesselator();
_tessTool = new TessTool(tt);
_curveFlattener = new SimpleCurveFlattener();
ClearColor = Color.White;
//--------
//set blend mode
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
}
