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* preattentive symbols Symbols with preattentive features aid pattern detection and reduce overlap. This symbol set implements ideas of Cleveland, Wilkinson, and others, and has been tested for popularity and discriminability, and adjusted for approximately equal weight. Many products support up to a dozen different symbol sets. This is analogous to multiple color schemes, such as Dr. Cindy Brewer's recently supported in d3. Not knowing d3's plans for symbol sets, I've only made a bare attempt at integrating these, but would be happy to continue this work along whatever lines are appropriate. * export new symbols * add tests for new symbols * PreTieR * Update README * Update README.md Co-authored-by: Philippe Rivière <fil@rezo.net> * Update README.md Co-authored-by: Philippe Rivière <fil@rezo.net> Co-authored-by: Heman Robinson <heman.robinson@gmail.com> Co-authored-by: Philippe Rivière <fil@rezo.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| import {min, sqrt} from "../math.js"; | ||
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| const sqrt3 = sqrt(3); | ||
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| export default { | ||
| draw(context, size) { | ||
| const r = sqrt(size + min(size / 28, 0.75)) * 0.59436; | ||
| const t = r / 2; | ||
| const u = t * sqrt3; | ||
| context.moveTo(0, r); | ||
| context.lineTo(0, -r); | ||
| context.moveTo(-u, -t); | ||
| context.lineTo(u, t); | ||
| context.moveTo(-u, t); | ||
| context.lineTo(u, -t); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| import {sqrt} from "../math.js"; | ||
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| export default { | ||
| draw(context, size) { | ||
| const r = sqrt(size) * 0.62625; | ||
| context.moveTo(0, -r); | ||
| context.lineTo(r, 0); | ||
| context.lineTo(0, r); | ||
| context.lineTo(-r, 0); | ||
| context.closePath(); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| import {min, sqrt} from "../math.js"; | ||
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| export default { | ||
| draw(context, size) { | ||
| const r = sqrt(size - min(size / 7, 2)) * 0.87559; | ||
| context.moveTo(-r, 0); | ||
| context.lineTo(r, 0); | ||
| context.moveTo(0, r); | ||
| context.lineTo(0, -r); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,9 @@ | ||
| import {sqrt} from "../math.js"; | ||
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| export default { | ||
| draw: function(context, size) { | ||
| var w = Math.sqrt(size), | ||
| x = -w / 2; | ||
| draw(context, size) { | ||
| const w = sqrt(size); | ||
| const x = -w / 2; | ||
| context.rect(x, x, w, w); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| import {sqrt} from "../math.js"; | ||
|
|
||
| export default { | ||
| draw(context, size) { | ||
| const r = sqrt(size) * 0.4431; | ||
| context.moveTo(r, r); | ||
| context.lineTo(r, -r); | ||
| context.lineTo(-r, -r); | ||
| context.lineTo(-r, r); | ||
| context.closePath(); | ||
| } | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| import {sqrt} from "../math.js"; | ||
|
|
||
| const sqrt3 = sqrt(3); | ||
|
|
||
| export default { | ||
| draw(context, size) { | ||
| const s = sqrt(size) * 0.6824; | ||
| const t = s / 2; | ||
| const u = (s * sqrt3) / 2; // cos(Math.PI / 6) | ||
| context.moveTo(0, -s); | ||
| context.lineTo(u, t); | ||
| context.lineTo(-u, t); | ||
| context.closePath(); | ||
| } | ||
| }; |
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