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getting scaling right
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@ -37,7 +37,6 @@ class CairoPlotter:
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#self.clipno = 0
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self.in_path = False
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self.update_ctm()
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self.context.set_line_width(LW)
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# A quick review of coordinate systems:
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# Cairo native: origin at upper left, x+ to right, y+ down.
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@ -45,32 +44,36 @@ class CairoPlotter:
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# Plotter window: same as plotter native.
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# We want to display in plotter native.
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def update_ctm(self):
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v,w = self.viewport,self.window
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xs = (v[2]-v[0])/(w[2]-w[0])
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ys = (v[3]-v[1])/(w[3]-w[1])
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x0 = v[0] - w[0]*xs
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y0 = v[1] - w[1]*ys
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window_m = cairo.Matrix(xx=xs, yy=ys, x0=x0, y0=y0)
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pn_to_cn = cairo.Matrix(yy=-1.0, y0=H)
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self.context.set_matrix(pn_to_cn)
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#self.context.set_matrix(pn_to_cn.multiply(window_m))
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self.context.set_matrix(window_m.multiply(pn_to_cn))
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self.context.set_line_width(LW)
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def update_font(self):
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m = cairo.Matrix(xx=self.text_size, yy=-self.text_size)
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m2 = cairo.Matrix.init_rotate(math.radians(self.text_theta))
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m.multiply(m2)
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self.context.set_font_matrix(m)
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self.context.set_font_matrix(m.multiply(m2))
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def finish_path(self):
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if self.in_path:
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self.context.stroke_preserve()
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self.in_path = False
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def invalidate_window(self):
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pass
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def vp(self, params):
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self.invalidate_window()
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l=coordlist(params,4)
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self.viewport=(l[0],l[1],l[2],l[3])
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self.update_ctm()
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def wd(self, params):
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self.invalidate_window()
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l=coordlist(params,4)
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self.window=(l[0],l[1],l[2],l[3])
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self.update_ctm()
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def ma(self, params):
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l=coordlist(params,2)
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