[{"data":1,"prerenderedAt":4916},["ShallowReactive",2],{"indicators:getting-started/primer-first-indicator":3},{"slug":4,"filePath":5,"frontmatter":6,"rawMarkdown":11,"tree":12},"getting-started/primer-first-indicator","getting-started/primer-first-indicator.md",{"title":7,"description":8,"order":9,"section":10},"Build your first Indicator","Build a real EMA crossover step by step, one idea at a time, from a single average to a finished Indicator with a mark on every cross. On the last page you…",6,"getting-started","---\ntitle: \"Build your first Indicator\"\ndescription: \"Build a real EMA crossover step by step, one idea at a time, from a single average to a finished Indicator with a mark on every cross. On the last page you…\"\norder: 6\nsection: \"getting-started\"\n---\n\n\u003C!-- source: docs/indicators/getting-started/primer-first-indicator.md; generated by packages/cli/scripts/gen-indicator-docs.ts, do not edit -->\n\n# Build your first Indicator\n\nBuild a real EMA crossover step by step, one idea at a time, from a single\naverage to a finished Indicator with a mark on every cross. On the last page\nyou drew one line. Now we build something traders actually watch: when a\nfast average rises above a slow one, momentum is turning up. We get there\nin four small steps, each adding exactly one idea. Type along, press Run\nafter each step, and watch the chart change. Everything on this page is a\ncomplete file: paste it under the `//@lang=wrun-ts` marker and it runs.\n\n## Step 1: One moving average\n\nStart from the template and change one thing: swap the simple average for an\nexponential one. `Ema` weights recent bars more heavily, so it turns a\nlittle sooner than `Sma`. The declarations, the state, and the four\nfunctions are the ones you already know.\n\n```typescript\nimport { input, line, ohlcv, output, overlay, param } from \"./sdk/declare\";\nimport { in_close } from \"./gen/inputs\";\nimport { emitRow, out_avg } from \"./gen/outputs\";\nimport { p_period } from \"./gen/params\";\nimport { Ema } from \"./sdk/ta\";\n\nparam(\"period\", 20, { min: 1, max: 200, description: \"EMA length in bars\" });\ninput(\"close\", ohlcv.close);\noutput(\"avg\", line, overlay, { color: \"#2563eb\", width: 2, description: \"EMA of the close\" });\n\nlet ema = new Ema(20);\nlet value: f64 = NaN;\n\nexport function init(): void {\n ema = new Ema(i32(p_period()));\n}\n\nexport function state(): i32 {\n value = ema.update(in_close());\n return isNaN(value) ? 0 : 1;\n}\n\nexport function finalize(): void {\n out_avg(value);\n emitRow();\n}\n\nexport function reset(): void {\n ema.reset();\n value = NaN;\n}\n```\n\nSame three parts as before, with two small changes. `new Ema(...)` replaces\n`new Sma(...)`, and the output carries a `color`, a `width`, and a\n`description`: the description is the legend text, and the color and width\nare the line's look. Styling is declared on the output, never computed in\nthe code, which is why the chart can restyle a line without recompiling.\n\nOn the chart you'll see the jagged candles and, riding through the middle of\nthem, a calm blue line. That blue line is the trend.\n\n## Step 2: A second, faster average\n\nA moving average is an average that slides forward one bar at a time. The\nperiod controls how much it smooths: a large period (like 21) reacts slowly\nand shows the broad trend, while a small period (like 9) hugs price closely\nand reacts fast.\n\nThat difference in speed is the whole idea behind a crossover. If we draw a\n**fast** average and a **slow** average together, the fast one leads and the\nslow one lags. The moment the fast crosses above the slow is the moment\nshort-term momentum has pulled ahead of the longer trend. Here are both,\neach with its own setting:\n\n```typescript\nimport { input, line, ohlcv, output, overlay, param } from \"./sdk/declare\";\nimport { in_close } from \"./gen/inputs\";\nimport { emitRow, out_fast, out_slow } from \"./gen/outputs\";\nimport { p_fast, p_slow } from \"./gen/params\";\nimport { Ema } from \"./sdk/ta\";\n\nparam(\"fast\", 9, { min: 1, max: 200, description: \"Fast EMA length\" });\nparam(\"slow\", 21, { min: 2, max: 400, description: \"Slow EMA length\" });\ninput(\"close\", ohlcv.close);\noutput(\"fast\", line, overlay, { color: \"#2563eb\", width: 2, description: \"Fast EMA of the close\" });\noutput(\"slow\", line, overlay, { color: \"#f97316\", width: 2, description: \"Slow EMA of the close\" });\n\nlet fast = new Ema(9);\nlet slow = new Ema(21);\nlet fastValue: f64 = NaN;\nlet slowValue: f64 = NaN;\n\nexport function init(): void {\n fast = new Ema(i32(p_fast()));\n slow = new Ema(i32(p_slow()));\n}\n\nexport function state(): i32 {\n const close = in_close();\n fastValue = fast.update(close);\n slowValue = slow.update(close);\n return isNaN(slowValue) ? 0 : 1;\n}\n\nexport function finalize(): void {\n out_fast(fastValue);\n out_slow(slowValue);\n emitRow();\n}\n\nexport function reset(): void {\n fast.reset();\n slow.reset();\n fastValue = NaN;\n slowValue = NaN;\n}\n```\n\nEvery new output needs its `out_\u003Cname>` import and a write in `finalize()`;\nevery new param needs its `p_\u003Cname>` import and a read in `init()`. Notice\nthat `state()` waits for the slower average (`isNaN(slowValue)`), so both\nlines start on the same bar instead of the fast one appearing twelve bars\nearly.\n\nNow there are two lines: a blue fast EMA (period 9) and an orange slow EMA\n(period 21). Watch how the blue line whips around more, while the orange one\nglides. Where the blue line pokes up through the orange one, momentum is\nflipping upward. That crossing point is what we want to catch.\n\n## Step 3: Detecting the cross\n\nNow we want to know the exact moment the fast line crosses above the slow\nline, not eyeball it. The TA kit has a class for precisely this: `Cross`.\nConstruct one in `init()`, feed it both values once per bar, and it answers\n`+1` on the single bar where the first value rises from at-or-below the\nsecond to above it, `-1` on the opposite cross, and `0` everywhere else\n(including any bar where either side is still `NaN`).\n\n```text\nlet cross = new Cross();\nlet crossed: i32 = 0;\n\n// in state(), after both averages are updated:\ncrossed = cross.update(fastValue, slowValue);\n```\n\nRead it out loud: \"crossed is plus one when fast crosses over slow.\" On most\nbars `crossed` is `0`. On the one bar where the blue line breaks above the\norange line, it flips to `1`. That single `1` is our signal. Next we draw\nsomething there.\n\nThere is no `if` around a plot in an Indicator, because an Indicator never\ncalls a plot function. A decision is a number, so the cross becomes an\noutput of its own: `1` on the signal bar, `0` otherwise. Outputs that exist\nonly to carry a decision are declared with the plot kind `none`: computed\nevery bar, drawn never.\n\n## Step 4: Marking the cross on the chart\n\nA `0` or `1` is invisible. To see the signal we draw a mark, but only on the\nbars where the cross happened. An output declared with the plot kind\n`shape` draws a mark at its value on every bar it has one; the `shape_where`\noption names a gate output, and the mark draws only on bars where the gate\nis nonzero. Put the mark's value at the bar's low so it sits just under the\ncandle, out of the way of the price action.\n\n```typescript\nimport { input, line, none, ohlcv, output, overlay, param, shape } from \"./sdk/declare\";\nimport { in_close, in_low } from \"./gen/inputs\";\nimport { emitRow, out_cross_up, out_fast, out_is_cross_up, out_slow } from \"./gen/outputs\";\nimport { p_fast, p_slow } from \"./gen/params\";\nimport { Cross, Ema } from \"./sdk/ta\";\n\n// 1. Two settings.\nparam(\"fast\", 9, { min: 1, max: 200, description: \"Fast EMA length\" });\nparam(\"slow\", 21, { min: 2, max: 400, description: \"Slow EMA length\" });\n// 2. The chart's own close for the averages, and its low to place the mark.\ninput(\"close\", ohlcv.close);\ninput(\"low\", ohlcv.low);\n// 3. Two lines on the price pane.\noutput(\"fast\", line, overlay, { color: \"#2563eb\", width: 2, description: \"Fast EMA of the close\" });\noutput(\"slow\", line, overlay, { color: \"#f97316\", width: 2, description: \"Slow EMA of the close\" });\n// 4. A mark at the bar's low, drawn only where the gate is 1.\noutput(\"cross_up\", shape, overlay, { color: \"#16a34a\", shape_where: \"is_cross_up\", description: \"Fast EMA crossed above slow EMA\" });\noutput(\"is_cross_up\", none);\n\nlet fast = new Ema(9);\nlet slow = new Ema(21);\nlet cross = new Cross();\nlet fastValue: f64 = NaN;\nlet slowValue: f64 = NaN;\nlet low: f64 = NaN;\nlet crossed: i32 = 0;\n\nexport function init(): void {\n fast = new Ema(i32(p_fast()));\n slow = new Ema(i32(p_slow()));\n cross = new Cross();\n}\n\nexport function state(): i32 {\n const close = in_close();\n low = in_low();\n fastValue = fast.update(close);\n slowValue = slow.update(close);\n crossed = cross.update(fastValue, slowValue);\n return isNaN(slowValue) ? 0 : 1;\n}\n\nexport function finalize(): void {\n out_fast(fastValue);\n out_slow(slowValue);\n out_cross_up(low);\n out_is_cross_up(crossed == 1 ? 1.0 : 0.0);\n emitRow();\n}\n\nexport function reset(): void {\n fast.reset();\n slow.reset();\n cross.reset();\n fastValue = NaN;\n slowValue = NaN;\n low = NaN;\n crossed = 0;\n}\n```\n\nA few things to unpack here:\n\n- **`output(\"cross_up\", shape, overlay, ...)`** draws a mark instead of a\n line. Its value is the bar's low, so the mark sits under the candle; its\n `color` is the mark's color.\n- **`shape_where: \"is_cross_up\"`** names the gate. The mark draws only on\n bars where `is_cross_up` is nonzero. Everywhere else, nothing is drawn.\n- **`output(\"is_cross_up\", none)`** is the decision itself: `1` on the cross\n bar, `0` otherwise. It never draws, but it exists, and once the Indicator\n is published and installed it is a metric an alert can watch crossing\n above `0`.\n- **`crossed == 1 ? 1.0 : 0.0`** turns the `Cross` answer into that output.\n Outputs are always `f64`, so the integer answer becomes a float here.\n\nPress Run, and you'll see the two EMAs weaving across each other, with a\ngreen mark under the candle at each upward cross. That is a genuine\nmomentum signal, built from the same three parts you learned on page one\nplus two new ideas: a class that detects a condition (`Cross`) and an output\nthat draws only when another output says so (`shape` with `shape_where`).\n\n## Step 5: Change a setting without recompiling\n\nOpen the overlay's settings on the chart. Every `param(...)` is a setting\nthere: change `fast` to 12 and `slow` to 26 and both lines recompute without\nrecompiling. To change what the setting offers (its default or its range),\nedit the declaration and Run again.\n\n## Save, download, publish\n\n**Save** keeps the file under **My Scripts**, beside your kScript (legacy)\nscripts. **Download package** hands you `\u003Cname>-\u003Cversion>.tgz` once the\nIndicator compiles cleanly: the built module, its sheet (`wrun/metadata.json`,\nderived from your declarations), and the manifest (`om-package.json`),\nexactly what the registry and the `om` CLI consume. **Publish** opens the\nregistry in a popup: a package name (`/name`), a version\n(`MAJOR.MINOR.PATCH`), a visibility, a description. A published version is\npermanent (bump the version to revise) and it is what unlocks everything\nbeyond the draft: other people add it from the Indicators tab, alerts can\nwatch it (an alert on a draft is refused with \"Publish the Indicator before\nadding an alert\"), and `om install /name` puts it on any machine\n(`functions/publishing.md`).\n\n## Next\n\nYou now know enough to read most Indicators and write simple ones. The next\npage points you to where to go from here: complete real-world recipes, how\nthe host runs your code, and the references you will reach for most.\n\n[Next steps](primer-next-steps.md)\n",{"type":13,"children":14,"data":4909,"position":4911},"root",[15,25,28,29,68,69,88,89,146,147,900,901,1015,1016,1030,1031,1048,1049,1064,1065,1129,1130,2120,2121,2253,2254,2269,2270,2287,2288,2416,2417,2469,2470,2560,2561,2648,2649,2665,2666,2756,2757,4133,4134,4148,4149,4434,4435,4502,4503,4519,4520,4589,4590,4606,4607,4851,4852,4868,4869,4884,4885],{"type":16,"value":17,"position":18},"comment"," source: docs/indicators/getting-started/primer-first-indicator.md; generated by packages/cli/scripts/gen-indicator-docs.ts, do not edit ",{"start":19,"end":22},{"line":20,"column":20,"offset":21},1,0,{"line":20,"column":23,"offset":24},145,144,{"type":26,"value":27},"text","\n",{"type":26,"value":27},{"type":30,"tagName":31,"properties":32,"children":33,"position":65},"element","p",{},[34,44,58],{"type":26,"value":35,"position":36},"Build a real EMA crossover step by step, one idea at a time, from a single\naverage to a finished Indicator with a mark on every cross. 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