20b

2020/sketch_2020_11_20b/sketch_2020_11_20b.pyde

@@ -0,0 +1,45 @@
+from villares.line_geometry import inter_lines, draw_poly, Line, min_max
+
+def setup():
+    size(400, 400)
+
+def draw():
+    background(200, 200, 230)
+    stroke(0)
+    fill(255)
+    r = rect_points(75, 100, 200, 155)
+    r.append((100, 150))
+    r.insert(3, (150, 300))
+    # r.extend(rect_points(150, 120, 50, 50))
+
+    draw_poly(r)
+    hatch_poly(r, radians(mouseX))
+
+def hatch_poly(points, angle, **kwargs):
+    spacing = kwargs.get('spacing', 5)
+    bound = min_max(points)
+    diag = Line(bound)
+    d = diag.dist()
+    cx, cy, _  = diag.midpoint()
+    num = int(d / spacing)
+    rr = [rotp(x, y, angle, cx, cy)
+          for x, y in rect_points(cx, cy, d, d, mode=CENTER)]
+    # stroke(255, 0, 0)   # debug mode
+    ab = Line(rr[0], rr[1])  # ;ab.plot()  # debug mode
+    cd = Line(rr[3], rr[2])  # ;cd.plot()  # debug mode
+    for i in range(num + 1):
+        abp = ab.line_point(i / float(num) + EPSILON)
+        cdp = cd.line_point(i / float(num) + EPSILON)
+        for hli in inter_lines(Line(abp, cdp), points):
+            hli.plot()
+
+def rect_points(x, y, w, h, mode=CORNER):
+    if mode == CENTER:
+        x, y = x - w / 2.0, y - h / 2.0
+    return [(x, y), (x + w, y), (x + w, y + h), (x, y + h)]
+
+def rotp(xp, yp, angle, x0=0, y0=0):
+    x, y = xp - x0, yp - y0  # translate to origin
+    rx = x0 + x * cos(angle) - y * sin(angle)
+    ry = y0 + y * cos(angle) + x * sin(angle)
+    return (rx, ry)