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jdh2358jdh2358
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some work on agg swig wrapper
svn path=/trunk/matplotlib/; revision=1496
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‎CHANGELOG‎

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New entries should be added at the top
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2005-06-23 Updated examples/agg_test.py to demonstrate curved paths
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and fills - JDH
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2005-06-21 Moved some texmanager and backend_agg tex caching to class
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level rather than instance level - JDH
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‎examples/agg_test.py‎

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# documentation -- you have to know how to use the agg c++ API to use
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# it
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import matplotlib.agg as agg
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from math import pi
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## Define some colors
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red = agg.rgba8(255,0,0,255)
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blue = agg.rgba8(0,0,255,255)
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green = agg.rgba8(0,255,0,255)
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black = agg.rgba8(0,0,0,255)
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white = agg.rgba8(255,255,255,255)
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yellow = agg.rgba8(192,192,255,255)
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## Create the rendering buffer, rasterizer, etc
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width, height = 600,400
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stride = width*4
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buffer = agg.buffer(width, height, stride)
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rbuf = agg.rendering_buffer()
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rbuf.attachb(buffer)
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red = agg.rgba8(255,0,0,255)
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blue = agg.rgba8(0,0,255,255)
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green = agg.rgba8(0,255,0,255)
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black = agg.rgba8(0,0,0,255)
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white = agg.rgba8(255,255,255,255)
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yellow = agg.rgba8(192,192,255,255)
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pf = agg.pixel_format_rgba(rbuf)
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rbase = agg.renderer_base_rgba(pf)
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rbase.clear_rgba8(blue)
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renderer = agg.renderer_scanline_aa_solid_rgba(rbase);
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renderer.color_rgba8( red )
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rasterizer = agg.rasterizer_scanline_aa()
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scanline = agg.scanline_p8()
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## A polygon path
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path = agg.path_storage()
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path.move_to(10,10)
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path.line_to(100,100)
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path.line_to(200,200)
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path.line_to(100,200)
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path.close_polygon()
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# stroke it
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stroke = agg.conv_stroke_path(path)
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stroke.width(3.0)
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rasterizer.add_path(stroke)
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agg.render_scanlines_rgba(rasterizer, scanline, renderer);
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pf = agg.pixel_format_rgba(rbuf)
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rbase = agg.renderer_base_rgba(pf)
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rbase.clear_rgba8(blue)
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## A curved path
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path = agg.path_storage()
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path.move_to(200,10)
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path.line_to(350,50)
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path.curve3(150,200)
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path.curve3(100,70)
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path.close_polygon()
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curve = agg.conv_curve_path(path)
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renderer = agg.renderer_scanline_aa_solid_rgba(rbase);
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renderer.color_rgba8( red )
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# fill it
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rasterizer.add_path(curve)
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renderer.color_rgba8( green )
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agg.render_scanlines_rgba(rasterizer, scanline, renderer);
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rasterizer = agg.rasterizer_scanline_aa()
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# and stroke it
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stroke = agg.conv_stroke_curve(curve)
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stroke.width(5.0)
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rasterizer.add_path(stroke)
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renderer.color_rgba8( yellow )
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agg.render_scanlines_rgba(rasterizer, scanline, renderer);
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scanline = agg.scanline_p8()
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## Transforming a path
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path = agg.path_storage()
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path.move_to(0,0)
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path.line_to(1,0)
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path.line_to(1,1)
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path.line_to(0,1)
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path.close_polygon()
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rotation = agg.trans_affine_rotation(pi/4)
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scaling = agg.trans_affine_scaling(30,30)
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translation = agg.trans_affine_translation(300,300)
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trans = rotation*scaling*translation
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transpath = agg.conv_transform_path(path, trans)
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stroke = agg.conv_stroke_transpath(transpath)
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stroke.width(2.0)
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rasterizer.add_path(stroke)
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renderer.color_rgba8( black )
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agg.render_scanlines_rgba(rasterizer, scanline, renderer);
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## Converting a transformed path to a curve
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path = agg.path_storage()
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path.move_to(0,0)
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path.curve3(1,0)
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path.curve3(1,1)
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path.curve3(0,1)
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path.close_polygon()
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rotation = agg.trans_affine_rotation(pi/4)
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scaling = agg.trans_affine_scaling(30,30)
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translation = agg.trans_affine_translation(300,250)
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trans = rotation*scaling*translation
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transpath = agg.conv_transform_path(path, trans)
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curvetrans = agg.conv_curve_trans(transpath)
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stroke = agg.conv_stroke_curvetrans(curvetrans)
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stroke.width(2.0)
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rasterizer.add_path(stroke)
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renderer.color_rgba8( white )
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agg.render_scanlines_rgba(rasterizer, scanline, renderer);
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## Copy a rectangle from the buffer the rectangle defined by
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## x0,y0->x1,y1 and paste it at xdest, ydest
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x0, y0 = 10, 50
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x1, y1 = 110, 190
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xdest, ydest = 350, 200
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widthr, heightr = x1-x0, y1-y0
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strider = widthr*4
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copybuffer = agg.buffer(widthr, heightr, strider)
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rbufcopy = agg.rendering_buffer()
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rbufcopy.attachb(copybuffer)
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pfcopy = agg.pixel_format_rgba(rbufcopy)
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rbasecopy = agg.renderer_base_rgba(pfcopy)
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rect = agg.rect(x0, y0, x1, y1)
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print rect.is_valid()
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rectp = agg.rectPtr(rect)
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#print dir(rbasecopy)
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# agg is funny about the arguments to copy from; the last 2 args are
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# dx, dy. If the src and dest buffers are the same size and you omit
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# the dx and dy args, the position of the copy in the dest buffer is
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# the same as in the src. Since our dest buffer is smaller than our
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# src buffer, we have to offset the location by -x0, -y0
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rbasecopy.copy_from(rbuf, rect, -x0, -y0);
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# paste the rectangle at a new location xdest, ydest
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rbase.copy_from(rbufcopy, None, xdest, ydest);
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## Display it with PIL
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s = buffer.to_string()
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print len(s)
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import Image

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