[SCM] calf/master: + GUI: add a Python script used to generate knob.png

[js at users.alioth.debian.org]

The following commit has been merged in the master branch:
commit e601278de39d3afa6c3d475826c249a773e0fcdb
Author: kfoltman <kfoltman at 78b06b96-2940-0410-b7fc-879d825d01d8>
Date:   Sat Jul 5 09:07:47 2008 +0000

    + GUI: add a Python script used to generate knob.png
    
    
    git-svn-id: https://calf.svn.sourceforge.net/svnroot/calf/trunk@225 78b06b96-2940-0410-b7fc-879d825d01d8

diff --git a/knobs/knob2.py b/knobs/knob2.py
new file mode 100644
index 0000000..bd1df24
--- /dev/null
+++ b/knobs/knob2.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python
+
+import cairo
+from math import pi, cos, sin
+
+WIDTH, HEIGHT = 40, 40
+x, y = WIDTH / 2, HEIGHT / 2
+lwidth = WIDTH / 10
+radius = WIDTH / 2 - lwidth
+radiusplus = radius + lwidth / 2
+radiusminus = radius - lwidth / 2
+radiusminus2 = radius - lwidth
+radiusminus3 = radius - lwidth * 3 / 2
+radiusint = (radius - lwidth / 2) * 0.25
+value = 0.7
+arrow = WIDTH / 10
+phases = 65
+
+# Setup Cairo
+surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, phases * WIDTH, HEIGHT * 3)
+ctx = cairo.Context(surface)
+ctx.set_source_rgba(0.75, 0.75, 0.75, 0)
+ctx.rectangle(0, 0, phases * WIDTH, 3 * HEIGHT)
+ctx.fill()
+
+for variant in range(0, 3):
+    x = WIDTH / 2
+    y = HEIGHT * (variant + 0.5)
+    for phase in range(0, phases):
+        # Draw out the triangle using absolute coordinates
+        value = phase * 1.0 / (phases - 1)
+        sangle = (180-45)*pi/180
+        eangle = (360+45)*pi/180
+        vangle = sangle + value * (eangle - sangle)
+        c, s = cos(vangle), sin(vangle)
+
+        nleds = 31
+        midled = (nleds - 1) / 2
+        midphase = (phases - 1) / 2
+        spacing = pi / nleds
+        for led in range(0, nleds):
+            adelta = (eangle - sangle - spacing) / (nleds - 1)
+            lit = False
+            hilite = False
+            lvalue = led * 1.0 / (nleds - 1)
+            pvalue = phase * 1.0 / (phases - 1)
+            if variant == 0: lit = (pvalue == 1.0) or pvalue > lvalue
+            if variant == 1: 
+                if pvalue < 0.5:
+                    lit = (lvalue > pvalue or pvalue == 0.0) and lvalue <= 0.5
+                else:
+                    lit = (lvalue < pvalue or pvalue == 1.0) and lvalue >= 0.5
+                if led == midled:
+                    lit = (phase == midphase)
+                    hilite = True
+            if variant == 2: lit = pvalue == 0 or pvalue < lvalue
+            if not lit:
+                ctx.set_source_rgb(0, 0, 0)
+            else:
+                if hilite:
+                    ctx.set_source_rgb(1, 1, 0)
+                else:
+                    ctx.set_source_rgb(1, 0.5, 0)
+            ctx.set_line_width(3)
+            ctx.arc(x, y, radius, sangle + adelta * led, sangle + adelta * led + spacing)
+            ctx.stroke()
+
+        #ctx.set_line_width(lwidth)
+        #ctx.set_source_rgb(1, 0.5, 0)
+        #ctx.arc(x, y, radius, sangle, vangle)
+        #ctx.line_to(x + radiusint * c, y + radiusint * s)
+        #ctx.stroke()
+
+        grad = cairo.LinearGradient(x - radius / 2, y - radius / 2, x + radius / 2, y + radius / 2)
+        #grad.add_color_stop_rgb(0.0, 0.5, 0.5, 0.5)
+        #grad.add_color_stop_rgb(1.0, 0.8, 0.8, 0.8)
+        grad.add_color_stop_rgb(0.0, 0.5, 0.5, 0.5)
+        grad.add_color_stop_rgb(1.0, 0.8, 0.8, 0.8)
+        ctx.set_source(grad)
+        # ctx.set_source_rgb(0.8, 0.8, 0.8)
+        ctx.set_line_width(2)
+        ctx.arc(x, y, radiusminus2, 0, 2 * pi)
+        ctx.fill()
+
+        grad = cairo.LinearGradient(x - radius / 2, y - radius / 2, x + radius / 2, y + radius / 2)
+        grad.add_color_stop_rgb(0.0, 0.8, 0.8, 0.8)
+        grad.add_color_stop_rgb(1.0, 0.5, 0.5, 0.5)
+        ctx.set_source(grad)
+        ctx.arc(x, y, radiusminus3, 0, 2 * pi)
+        ctx.fill()
+        ctx.set_source_rgb(0, 0, 0)
+        ctx.set_line_width(2)
+        ctx.arc(x, y, radiusminus2, 0, 2 * pi)
+        ctx.stroke()
+
+        ctx.set_source_rgba(0, 0, 0, 0.5)
+        ctx.set_line_width(1)
+        mtx = ctx.get_matrix()
+        ctx.translate(x + radiusminus2 * c, y + radiusminus2 * s)
+        ctx.rotate(vangle)
+        ctx.move_to(0, 0)
+        ctx.line_to(-radius/2, 0)
+        ctx.stroke()
+        ctx.set_matrix(mtx)
+        x += WIDTH
+
+#ctx.set_source_rgb(1, 0.5, 0)
+#ctx.line_to(x + radiusplus * c, y + radiusplus * s)
+#ctx.stroke()
+
+# Output a PNG file
+surface.write_to_png("knob.png")

-- 
calf audio plugins packaging