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1.1 ! root 1: stardemo = proc () ! 2: agon = 36 ! 3: ai = array[int] ! 4: ! 5: bwidth: int := int$parse(xdemo_default("star", "BorderWidth")) ! 6: except when not_found, overflow, bad_format: bwidth := 2 end ! 7: back: x_pixmap := x_display$white() ! 8: bdr: x_pixmap := x_display$black() ! 9: backpix: int := WhitePixel ! 10: linepix: int := BlackPixel ! 11: if x_display$cells() > 2 ! 12: then begin ! 13: r, g, b: int := x_parse_color(xdemo_default("star", "Background")) ! 14: backpix := x_display$alloc_color(r, g, b) ! 15: back := x_pixmap$tile(backpix) ! 16: end except when not_found: end ! 17: begin ! 18: r, g, b: int := x_parse_color(xdemo_default("star", "Border")) ! 19: bdr := x_pixmap$tile(x_display$alloc_color(r, g, b)) ! 20: end except when not_found: end ! 21: linepix := x_display$alloc_cell() ! 22: end ! 23: w: x_window, wid0, hgt0: int := x_cons("star", back, bdr, ! 24: xdemo_geometry(), "=400x400+1+1", ! 25: 40, 40, bwidth) ! 26: w.name := "star" ! 27: w.input := UnmapWindow ! 28: x_window$map(w) ! 29: w.input := ExposeWindow + UnmapWindow ! 30: vlist: x_vlist := x_vlist$create(agon * 2) ! 31: cx: ai := ai$fill(0, agon, 0) ! 32: cy: ai := ai$fill(0, agon, 0) ! 33: ev: event := x_input$empty_event() ! 34: while true do ! 35: sx, sy, width, height, bw, ms, wk: int, iw: x_window := x_window$query(w) ! 36: if width <= 30 cor height <= 30 ! 37: then break end ! 38: xcent: int := width / 2 ! 39: ycent: int := height / 2 ! 40: cx[0] := int$min(height, width) / 2 - 10 ! 41: cy[0] := 0 ! 42: cos: int := 32270 ! 43: sin: int := 5690 ! 44: for i: int in int$from_to(1, agon - 1) do ! 45: cx[i] := (cx[i - 1] * cos - cy[i - 1] * sin + 16384) / 32768 ! 46: cy[i] := (cx[i - 1] * sin + cy[i - 1] * cos + 16384) / 32768 ! 47: end ! 48: for i: int in int$from_to(0, agon - 1) do ! 49: cx[i] := cx[i] + xcent ! 50: cy[i] := cy[i] + ycent ! 51: end ! 52: x_window$clear(w) ! 53: while ~x_input$pending() do ! 54: if linepix ~= BlackPixel ! 55: then random_color(linepix) end ! 56: for i: int in int$from_to(0, agon - 2) do ! 57: for j: int in int$from_to(i + 1, agon - 1) do ! 58: k: int := 2 * (j - i) ! 59: x_vlist$store(vlist, k - 1, cx[i], cy[i], VertexDontDraw) ! 60: x_vlist$store(vlist, k, cx[j], cy[j], 0) ! 61: end ! 62: x_window$draw(w, vlist, 2 * (agon - 1 - i), linepix, 1, 1, ! 63: GXcopy, -1) ! 64: end ! 65: for i: int in int$from_to_by(agon - 2, 0, -1) do ! 66: for j: int in int$from_to_by(agon - 1, i + 1, -1) do ! 67: k: int := 2 * (j - i) ! 68: x_vlist$store(vlist, k - 1, cx[i], cy[i], VertexDontDraw) ! 69: x_vlist$store(vlist, k, cx[j], cy[j], 0) ! 70: end ! 71: x_window$draw(w, vlist, 2 * (agon - 1 - i), backpix, 1, 1, ! 72: GXcopy, -1) ! 73: end ! 74: x_window$query_mouse(w) ! 75: end ! 76: x_input$deq(ev) ! 77: if ev.kind = UnmapWindow ! 78: then x_input$deq(ev) end ! 79: end ! 80: x_window$destroy(w) ! 81: end stardemo
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