# Gradients

Canvas can fill shapes with color but also with gradients or images.

```
onPaint: {
    var ctx = getContext("2d")

    var gradient = ctx.createLinearGradient(100,0,100,200)
    gradient.addColorStop(0, "blue")
    gradient.addColorStop(0.5, "lightsteelblue")
    ctx.fillStyle = gradient
    ctx.fillRect(50,50,100,100)
}
```

The gradient in this example is defined along the starting point (100,0) to the end point (100,200), which gives a vertical line in the middle of our canvas. The gradient-stops can be defined as a color from 0.0 (gradient start point) to 1.0 (gradient endpoint). Here we use a `blue` color at `0.0` (100,0) and a `lightsteelblue` color at the `0.5` (100,200) position. The gradient is defined as much larger than the rectangle we want to draw, so the rectangle clips gradient to it’s defined the geometry.

![image](/files/edbjD00xlsHyEMYBHXI5)

{% hint style="info" %}
The gradient is defined in canvas coordinates not in coordinates relative to the path to be painted. A canvas does not have the concept of relative coordinates, as we are used to by now from QML.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.novaflowos.com/start/qt6-qml-book/readme/ch08-canvas/gradients.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.