drawing_generateCanvas

Create a new drawing canvas by specifying width and height in pixels for digital artwork or diagrams.

Instructions

Generate a new drawing canvas with specified width and height.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`width`	Yes	Width of the canvas in pixels
`height`	Yes	Height of the canvas in pixels

Implementation Reference

index.ts:87-105 (handler)

MCP tool handler case that processes the drawing_generateCanvas tool call, invokes the generateCanvas helper, and returns success/error response.

case "drawing_generateCanvas":
  try {
    currentCanvas = drawingTool.generateCanvas(args.width, args.height);
    return {
      content: [{
        type: "text",
        text: `Canvas generated with width: ${args.width}, height: ${args.height}`,
      }],
      isError: false,
    };
  } catch (error) {
    return {
      content: [{
        type: "text",
        text: `Failed to generate canvas: ${(error as Error).message}`,
      }],
      isError: true,
    };
  }

drawingTool.ts:105-107 (helper)
Core helper function that creates and returns a new Canvas instance with the specified dimensions.
```
function generateCanvas(width: number, height: number): Canvas {
    return new Canvas(width, height);
}
```

index.ts:22-33 (registration)

Tool registration object in the TOOLS array used for ListToolsRequest, includes name, description, and input schema.

{
  name: "drawing_generateCanvas",
  description: "Generate a new drawing canvas with specified width and height.",
  inputSchema: {
    type: "object",
    properties: {
      width: { type: "number", description: "Width of the canvas in pixels" },
      height: { type: "number", description: "Height of the canvas in pixels" },
    },
    required: ["width", "height"],
  },
},

drawingTool.ts:12-31 (helper)

Canvas class definition with constructor that initializes pixel array to white background, used by generateCanvas.

class Canvas {
    width: number;
    height: number;
    pixels: Pixel[][];

    constructor(width: number, height: number) {
        if (typeof width !== 'number' || width <= 0 || typeof height !== 'number' || height <= 0) {
            throw new Error("Canvas dimensions must be positive numbers.");
        }
        this.width = width;
        this.height = height;
        this.pixels = [];
        for (let y = 0; y < height; y++) {
            this.pixels[y] = [];
            for (let x = 0; x < width; x++) {
                // Default to white background
                this.pixels[y][x] = { r: 255, g: 255, b: 255, a: 255 };
            }
        }
    }

mcp-painter