# Canvas.DrawLineRgba

Draw line rgba through the Canvas runtime.

Last updated: 2026-09-09

Package: runtime.Canvas | Status: registered-intrinsic

Tags: builtin, canvas, cpu, yeho

Built into Yeho; no package import is needed. Native services require an admitted host and the correct resource lifecycle.

```yh
Canvas.DrawLineRgba(int startX, int startY, int endX, int endY, int thickness, int red, int green, int blue, int alpha) -> void
```


## Call Canvas.DrawLineRgba

A complete typed caller with illustrative arguments. Native operations need the corresponding host and resources.

Verification: type checked

```yh
int startX = 1
int startY = 1
int endX = 1
int endY = 1
int thickness = 1
int red = 1
int green = 1
int blue = 1
int alpha = 1
Canvas.DrawLineRgba(startX, startY, endX, endY, thickness, red, green, blue, alpha)

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.runtime__canvas_drawlinergba"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/runtime--Canvas.DrawLineRgba/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


The example checks the call shape. Opening windows, recording audio, changing files, network operations, and process operations have real effects when run. Follow the corresponding package lifecycle before using live resources.

Source: yeho/src/compiler/common/intrinsic_registry.cpp

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