60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
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// Copyright 2010 The draw2d Authors. All rights reserved.
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// created: 21/11/2010 by Laurent Le Goff, Stani Michiels
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// Package frameimage centers a png image and rotates it.
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package frameimage
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import (
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"math"
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"github.com/llgcode/draw2d"
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"github.com/llgcode/draw2d/samples"
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)
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// Main draws the image frame and returns the filename.
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// This should only be used during testing.
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func Main(gc draw2d.GraphicContext, ext string) (string, error) {
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// Margin between the image and the frame
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const margin = 30
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// Line width od the frame
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const lineWidth = 3
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// Gopher image
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gopher := samples.Resource("image", "gopher.png", ext)
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// Draw gopher
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err := Draw(gc, gopher, 297, 210, margin, lineWidth)
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// Return the output filename
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return samples.Output("frameimage", ext), err
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}
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// Draw the image frame with certain parameters.
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func Draw(gc draw2d.GraphicContext, png string,
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dw, dh, margin, lineWidth float64) error {
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// Draw frame
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draw2d.RoundRect(gc, lineWidth, lineWidth,
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dw-lineWidth, dh-lineWidth, 100, 100)
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gc.SetLineWidth(lineWidth)
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gc.FillStroke()
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// load the source image
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source, err := draw2d.LoadFromPngFile(png)
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if err != nil {
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return err
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}
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// Size of source image
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sw, sh := float64(source.Bounds().Dx()), float64(source.Bounds().Dy())
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// Draw image to fit in the frame
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// TODO Seems to have a transform bug here on draw image
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scale := math.Min((dw-margin*2)/sw, (dh-margin*2)/sh)
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gc.Save()
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gc.Translate((dw-sw*scale)/2, (dh-sh*scale)/2)
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gc.Scale(scale, scale)
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gc.Rotate(0.2)
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gc.DrawImage(source)
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gc.Restore()
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return nil
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}
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