How Can I Overlay and Rotate Images in Golang?

Image Manipulation in Golang

In Golang, the manipulation of images is possible through the image package. This package provides the necessary tools for drawing, resizing, and transforming images.

Problem Context

Consider three images: a background image (bi), and two other images (i1 and i2). The goal is to position i1 and i2 over bi at specific angles, ensuring proper placement based on their z-index values.

Solution

To achieve this, Golang offers the graphics-go package, which supports image rotations. The following pseudo-program outlines the solution:

import (
    "image"
    "image/jpeg"
    "os"
    "code.google.com/p/graphics-go/graphics"
)

func main() {
    // Load the images
    img1, _, _ := image.Decode(os.Open("image1.jpg"))
    img2, _, _ = image.Decode(os.Open("image2.jpg"))

    // Create a new image canvas
    m := image.NewRGBA(image.Rect(0, 0, 800, 600))

    // Draw the background image
    draw.Draw(m, m.Bounds(), img1, image.Point{0, 0}, draw.Src)

    // Apply rotation to the second image
    graphics.Rotate(m, img2, &graphics.RotateOptions{Angle: 3.5})

    // Save the final image
    jpeg.Encode(os.Create("final-image.jpg"), m, &jpeg.Options{jpeg.DefaultQuality})
}

Notes:

• The image package provides facilities for drawing and transforming images.
• The graphics-go package offers additional support for image rotations.
• The provided pseudo-program demonstrates the core principles for image manipulation in Golang.

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