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package Tk::BarberPole; |
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7957
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use strict; |
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use vars qw/$VERSION/; |
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use constant PI_OVER_180 => 3.141592659 / 180; |
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$VERSION = 0.01; |
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use Tk; |
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0
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use base qw/Tk::Derived Tk::Canvas/; |
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Construct Tk::Widget 'BarberPole'; |
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sub Populate { |
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my ($c, $args) = @_; |
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$c->SUPER::Populate($args); |
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$c->ConfigSpecs( |
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-width => [PASSIVE => undef, undef, 30], |
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-length => [PASSIVE => undef, undef, 100], |
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-stripewidth => [PASSIVE => undef, undef, 10], |
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-slant => [PASSIVE => undef, undef, 45], |
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-separation => [PASSIVE => undef, undef, 20], |
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-orientation => [PASSIVE => undef, undef, 'horizontal'], |
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-colors => [PASSIVE => undef, undef, [qw/red blue/]], |
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-delay => [METHOD => undef, undef, 50], |
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-highlightthickness => [SELF => 'highlightThickness','HighlightThickness',0], |
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-padx => [PASSIVE => 'padX', 'Pad', 0], |
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-pady => [PASSIVE => 'padY', 'Pad', 0], |
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-autostart => [PASSIVE => undef, undef, 1], |
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); |
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$c->afterIdle(['_drawPole', $c]); |
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} |
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sub _drawPole { |
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my $c = shift; |
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# calculate the angle, once and for all. |
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# and other values. |
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$c->{Len} = $c->cget('-length'); |
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$c->{Wid} = $c->cget('-width'); |
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$c->{Angle} = $c->cget('-slant') * PI_OVER_180; |
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$c->{Inc} = $c->{Wid} * tan($c->{Angle}); |
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$c->{Sep} = $c->cget('-separation'); |
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$c->{StripeW} = $c->cget('-stripewidth'); |
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$c->{Col} = $c->cget('-colors'); |
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$c->{Ori} = $c->cget('-orientation'); |
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# set the correct canvas size. |
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my ($w, $h) = $c->{Ori} eq 'horizontal' ? @{$c}{qw/Len Wid/} : @{$c}{qw/Wid Len/}; |
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my $bw = $c->cget('-borderwidth') + $c->cget('-highlightthickness'); |
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my $padx = $c->cget('-padx'); |
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my $pady = $c->cget('-pady'); |
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57
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my $startX = $padx + $bw; |
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my $startY = $pady + $bw; |
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60
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$w += 2 * $startX; |
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$h += 2 * $startY; |
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63
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$c->GeometryRequest($w, $h); |
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# draw the outline of the pole. |
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$c->createRectangle($startX, $startY, $w-$startX-1, $h - $startY-1, |
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-outline => 'black', |
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-tags => ['BORDER'], |
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); |
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71
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# now draw the stripes. |
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if ($c->{Ori} eq 'horizontal') { |
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my $x = -($c->{Inc} + $c->{StripeW}); |
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my $y = $startY; |
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my $color = 0; |
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77
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while ($x < $c->{Len}) { |
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push @{$c->{Stripes}} => |
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$c->createPolygon($x, $y, $x + $c->{Inc}, $y + $c->{Wid}, |
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$x + $c->{Inc} + $c->{StripeW}, $y + $c->{Wid}, |
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$x + $c->{StripeW}, $y, |
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-fill => $c->{Col}[$color % @{$c->{Col}}], |
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-tags => ['STRIPE'], |
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); |
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86
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$color ++; |
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$x += $c->{Sep}; |
88
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} |
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90
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# make sure the number of poles are a multiple of the number of colors. |
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if (my $mod = @{$c->{Stripes}} % @{$c->{Col}}) { |
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93
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my $count = $#{$c->{Col}} - $mod; |
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my $x = -($c->{Inc} + $c->{StripeW} + $c->{Sep}) - $count * $c->{Sep}; |
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96
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my @new; |
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for my $i (0 .. $count) { |
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push @new => |
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$c->createPolygon($x, $startY, $x + $c->{Inc}, $startY + $c->{Wid}, |
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$x + $c->{Inc} + $c->{StripeW}, $startY + $c->{Wid}, |
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$x + $c->{StripeW}, $startY, |
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-fill => $c->{Col}[$color % @{$c->{Col}}], |
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-tags => ['STRIPE'], |
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); |
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106
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$color ++; |
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$x += $c->{Sep}; |
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} |
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110
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unshift @{$c->{Stripes}} => @new; |
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} |
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113
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} else { |
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# vertical |
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my $x = $startX; |
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my $y = -($c->{Inc} + $c->{StripeW}); |
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my $color = 0; |
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119
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while ($y < $c->{Len}) { |
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push @{$c->{Stripes}} => |
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$c->createPolygon($x, $y, $x + $c->{Wid}, $y + $c->{Inc}, |
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$x + $c->{Wid}, $y + $c->{Inc} + $c->{StripeW}, |
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$x, $y + $c->{StripeW}, |
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-fill => $c->{Col}[$color % @{$c->{Col}}], |
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-tags => ['STRIPE'], |
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); |
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128
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$color ++; |
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$y += $c->{Sep}; |
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} |
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132
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# make sure the number of poles are a multiple of the number of colors. |
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if (my $mod = @{$c->{Stripes}} % @{$c->{Col}}) { |
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135
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my $count = $#{$c->{Col}} - $mod; |
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my $y = -($c->{Inc} + $c->{StripeW} + $c->{Sep}) - $count * $c->{Sep}; |
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my @new; |
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for my $i (0 .. $count) { |
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push @new => |
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$c->createPolygon($startX, $y, $startX + $c->{Wid}, $y + $c->{Inc}, |
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$startX + $c->{Wid}, $y + $c->{Inc} + $c->{StripeW}, |
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$startY, $y + $c->{StripeW}, |
143
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-fill => $c->{Col}[$color % @{$c->{Col}}], |
144
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-tags => ['STRIPE'], |
145
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); |
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147
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$color ++; |
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$y += $c->{Sep}; |
149
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} |
150
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151
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unshift @{$c->{Stripes}} => @new; |
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} |
153
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} |
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155
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# tag first stripe |
156
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$c->{First} = $c->{Stripes}[0]; |
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158
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$c->raise('BORDER'); |
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160
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$c->start if $c->cget('-autostart'); |
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} |
162
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163
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sub _animate { |
164
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my $c = shift; |
165
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166
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# check for any stripes that are outside the visible area |
167
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# and move them to the beginning. |
168
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169
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my @visible = $c->find(overlapping => 0, 0, $c->{Len}, $c->{Wid}); |
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my %h; |
171
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@h{@{$c->{Stripes}}} = 1; |
172
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delete $h{$_} for @visible; |
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174
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for my $id (keys %h) { |
175
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# find how far each stripe is from the end of the pole, |
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# and move it the same distance away from the first stripe. |
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178
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my @c = $c->coords($id); |
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180
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my $dist = $c->{Ori} eq 'horizontal' ? $c[0] - $c->{Len} : $c[1] - $c->{Len}; |
181
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next if $dist < 0; # before the beginning. |
182
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183
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# calculate offset |
184
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my @f = $c->coords($c->{First}); |
185
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my $offset = $c->{Ori} eq 'horizontal' ? |
186
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($c[0] - $f[0]) + $c->{Sep} : |
187
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($c[1] - $f[1]) + $c->{Sep}; |
188
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189
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# move it. |
190
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$c->move($id, $c->{Ori} eq 'horizontal' ? (-$offset, 0) : (0, -$offset)); |
191
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$c->{First} = $id; |
192
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} |
193
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194
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# now move everything. |
195
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$c->move(STRIPE => $c->{Ori} eq 'horizontal' ? (1, 0) : (0, 1)); |
196
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} |
197
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198
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sub delay { |
199
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my ($c, $v) = @_; |
200
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201
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if (defined $v) { |
202
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$c->{Delay} = $v; |
203
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} |
204
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205
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if ($c->{Anim}) { |
206
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$c->afterCancel($c->{RepID}); |
207
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$c->{RepID} = $c->repeat($c->{Delay}, ['_animate', $c]); |
208
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} |
209
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210
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return $c->{Delay}; |
211
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} |
212
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213
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sub start { |
214
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my $c = shift; |
215
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216
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return if $c->{Anim}; |
217
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218
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|
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|
# now start the animation |
219
|
|
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|
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|
|
$c->{RepID} = $c->repeat($c->{Delay}, ['_animate', $c]); |
220
|
|
|
|
|
|
|
$c->{Anim} = 1; |
221
|
|
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} |
222
|
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|
223
|
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sub stop { |
224
|
|
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|
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|
|
my $c = shift; |
225
|
|
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|
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|
226
|
|
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|
return unless $c->{Anim}; |
227
|
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|
228
|
|
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|
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|
# now stop the animation |
229
|
|
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|
|
|
|
$c->afterCancel($c->{RepID}); |
230
|
|
|
|
|
|
|
$c->{Anim} = 0; |
231
|
|
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|
|
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|
} |
232
|
|
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|
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|
233
|
|
|
|
|
|
|
sub tan { sin($_[0]) / cos($_[0]) } |
234
|
|
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|
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|
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|
235
|
|
|
|
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|
|
1; |
236
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|
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|
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|
237
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|
__END__ |