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Taco de Wolff edited this page Nov 16, 2022 · 2 revisions

Images can be rendered to a canvas at a certain resolution specifying the pixels per millimeter. A larger resolution will thus result in smaller images.

// Load the image data
lenna, err := os.Open("lenna.png")
if err != nil {
  panic(err)
}

// Decode the PNG image data to an image.Image
img, err := png.Decode(lenna)
if err != nil {
  panic(err)
}

// Draw the image at coordinates (10,10) with a resolution of 30 px/mm
c.DrawImage(10, 10, img, canvas.DPMM(30.0))

For some renderers the original image data is required (such as for SVG), in which case it is inefficient to decode the image and then re-encode it in the renderer. For this reason you can load images instead using:

// Load the image data
lenna, err := os.Open("lenna.png")
if err != nil {
  panic(err)
}

// Create a new image object
img, err := canvas.NewPNGImage(lenna)
if err != nil {
  panic(err)
}

// Draw the image at coordinates (10,10) with a resolution of 30 px/mm
c.DrawImage(10, 10, img, canvas.DPMM(30.0))

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