[http://mini.net/files/chatcanvas.jpg] "cool" and "handwriting" by [dkf], "very" by [RS], "Bye" by [stevel], all in a few minutes...
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n the [Tcl chatroom] we wanted to exchange drawings too, so here's an ultra quick shot we came up with:
 dkf	I'm really after a quick-and-dirty solution.
 dkf	Quick, dirty, but gets the job done and builds community.
 dgp	make it work now; make it good later?
 arjen	Well, it is almost weekend ... 
 dkf	Yes
 dkf	(But now, with all this discussion, I no longer want to draw the picture I was thinking of. Which was my point. If it's not immediate, it won't happen in a highly interactive environment like this.)
 suchenwi	I'm coding.. (standalone prototype, linked by user copy'n'paste...)
 suchenwi	Here comes the first quick shot:
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 proc transmit {w id} {
     set ::entry "\$white_board create line [string map {.0 {}} [$w coords $id]]"
    .e selection range 0 end
 }
 entry .e -textvar entry -bg white
 bind .e <Return> {eval $entry}
 set white_board [canvas .c -bg white]
 bind .c <1> {set entry ""; set id [%W create line %x %y %x %y]}
 bind .c <B1-Motion> {%W coords $id [concat [%W coords $id] %x %y]}
 bind .c <ButtonRelease-1> {transmit %W $id}
 pack .e .c -fill both -expand 1
----
Test data:
 $white_board create line 190.0 142.0 190.0 142.0 189.0 142.0 187.0 143.0 186.0 143.0  184.0 144.0 180.0 145.0 177.0 146.0 175.0 148.0 173.0 150.0 171.0 152.0 171.0 154.0 171.0 156.0 171.0 157.0 171.0 158.0 171.0 160.0 172.0 161.0 173.0 162.0 174.0 163.0 175.0 163.0 176.0 164.0 178.0 164.0 179.0 164.0 181.0 164.0 183.0 163.0 184.0 162.0 186.0 162.0 188.0 161.0 189.0 161.0 190.0 160.0 191.0 159.0 192.0 158.0 193.0 158.0 194.0 157.0 194.0 156.0 194.0 154.0 195.0 153.0 196.0 152.0 197.0 151.0 198.0 150.0 200.0 150.0 202.0 149.0 203.0 149.0 204.0 148.0 205.0 148.0 206.0 148.0 204.0 148.0 202.0 148.0 199.0 148.0 196.0 148.0 195.0 149.0 193.0 150.0 191.0 150.0 191.0 152.0 191.0 153.0 191.0 154.0 191.0 156.0 192.0 157.0 193.0 158.0 194.0 160.0 195.0 161.0 196.0 162.0 198.0 162.0 199.0 163.0 200.0 163.0 202.0 163.0 204.0 162.0 206.0 162.0 207.0 160.0 208.0 159.0 208.0 157.0 208.0 156.0 208.0 155.0 208.0 154.0 207.0 153.0 206.0 152.0 205.0 151.0 204.0 150.0 203.0 150.0 203.0 149.0 204.0 149.0 205.0 149.0 206.0 149.0 207.0 149.0 209.0 149.0 211.0 150.0 214.0 150.0 217.0 150.0 219.0 150.0 220.0 150.0 221.0 149.0 223.0 149.0 224.0 149.0 223.0 150.0 222.0 150.0 221.0 151.0 219.0 152.0 218.0 153.0 217.0 154.0 217.0 155.0 217.0 156.0 217.0 157.0 218.0 158.0 218.0 159.0 219.0 159.0 219.0 160.0 219.0 161.0 220.0 161.0 221.0 161.0 222.0 161.0 223.0 161.0 224.0 160.0 225.0 159.0 226.0 158.0 227.0 157.0 227.0 156.0 227.0 155.0 226.0 154.0 226.0 153.0 225.0 152.0 223.0 151.0 222.0 150.0 221.0 150.0 220.0 150.0 221.0 150.0 222.0 150.0 223.0 150.0 224.0 150.0 225.0 150.0 226.0 150.0 227.0 150.0 228.0 150.0 229.0 150.0 230.0 150.0 231.0 150.0 233.0 149.0 233.0 148.0 235.0 147.0 235.0 146.0 235.0 145.0 236.0 144.0 237.0 141.0 238.0 139.0 239.0 137.0 240.0 135.0 240.0 134.0 240.0 132.0 239.0 130.0 238.0 128.0 238.0 127.0 238.0 125.0 237.0 124.0 236.0 126.0 235.0 129.0 235.0 132.0 235.0 135.0 235.0 138.0 235.0 140.0 236.0 142.0 236.0 144.0 236.0 147.0 237.0 149.0 237.0 151.0 238.0 153.0 238.0 155.0 239.0 157.0 239.0 158.0 240.0 159.0 241.0 160.0 242.0 161.0 242.0 160.0 242.0 159.0

 $white_board create line 151 86 151 86 151 87 151 88 153 91 154 93 155 95 156 96 156 97 157 98 158 101 159 103 160 105 160 106 161 106 162 108 164 110 165 112 166 112 168 109 171 105 173 102 175 99 176 97 176 96 176 95 176 94 177 93 177 92 177 91 177 90 177 89 178 88 178 87 178 86 178 87 179 88 181 91 182 92 183 94 184 94 185 95 186 96 188 97 190 97 192 97 193 97 195 97 197 96 198 95 199 94 200 92 201 91 201 90 201 89 202 87 202 85 202 84 202 83 202 82 201 82 200 82 199 82 198 82 197 82 196 82 196 83 195 84 194 85 193 86 192 87 192 88 191 89 190 90 190 91 189 93 189 95 188 97 188 99 188 101 188 103 188 104 188 105 188 106 190 108 192 110 193 111 194 111 195 111 197 111 198 111 199 111 200 111 202 110 204 108 205 106 206 103 208 100 208 99 209 98 210 97 211 95 211 93 213 91 214 89 214 88 215 88 216 87 217 87 218 87 219 87 220 87 221 87 221 88 221 89 221 90 222 92 222 94 222 95 223 97 223 99 223 101 223 104 223 106 223 107 223 109 223 110 223 109 223 106 224 102 225 97 226 93 227 90 227 88 228 87 229 87 230 87 230 88 231 89 232 89 232 90 233 90 234 90 235 90 236 89 237 89 239 89 240 89 241 88 242 86 243 86 244 86 244 87 244 88 244 89 244 90 244 91 244 93 244 95 244 97 244 100 244 101 244 102 244 103 244 104 245 104 245 103 246 102 249 102 250 102 251 99 251 97 252 95 254 94 255 94 255 93 255 90 256 88 256 87 257 88 257 90 257 93 257 97 257 100 257 101 257 103 257 105 257 107 257 108 257 109 257 110 257 113 257 115 257 118 257 119 257 120 257 121 257 123 258 125 258 126 258 127 257 127 257 128 257 129 256 129 255 129 254 129 253 129 253 128 252 128 252 127 252 126 251 126 251 124 251 123 251 122 251 121 251 119 251 117 251 116 251 114 252 113 254 111 256 110 257 108 259 107 259 106 260 105 261 104 262 102 263 101 263 100 264 98 265 96 266 95 266 94 267 92 268 90 268 89 269 89 269 88 269 87 270 87