font_test.go

Documentation: golang.org/x/image/font

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package font
     6  
     7  import (
     8  	"image"
     9  	"strings"
    10  	"testing"
    11  
    12  	"golang.org/x/image/math/fixed"
    13  )
    14  
    15  const toyAdvance = fixed.Int26_6(10 << 6)
    16  
    17  type toyFace struct{}
    18  
    19  func (toyFace) Close() error {
    20  	return nil
    21  }
    22  
    23  func (toyFace) Glyph(dot fixed.Point26_6, r rune) (image.Rectangle, image.Image, image.Point, fixed.Int26_6, bool) {
    24  	panic("unimplemented")
    25  }
    26  
    27  func (toyFace) GlyphBounds(r rune) (fixed.Rectangle26_6, fixed.Int26_6, bool) {
    28  	return fixed.Rectangle26_6{
    29  		Min: fixed.P(2, 0),
    30  		Max: fixed.P(6, 1),
    31  	}, toyAdvance, true
    32  }
    33  
    34  func (toyFace) GlyphAdvance(r rune) (fixed.Int26_6, bool) {
    35  	return toyAdvance, true
    36  }
    37  
    38  func (toyFace) Kern(r0, r1 rune) fixed.Int26_6 {
    39  	return 0
    40  }
    41  
    42  func (toyFace) Metrics() Metrics {
    43  	return Metrics{}
    44  }
    45  
    46  func TestBound(t *testing.T) {
    47  	wantBounds := []fixed.Rectangle26_6{
    48  		{Min: fixed.P(0, 0), Max: fixed.P(0, 0)},
    49  		{Min: fixed.P(2, 0), Max: fixed.P(6, 1)},
    50  		{Min: fixed.P(2, 0), Max: fixed.P(16, 1)},
    51  		{Min: fixed.P(2, 0), Max: fixed.P(26, 1)},
    52  	}
    53  
    54  	for i, wantBound := range wantBounds {
    55  		s := strings.Repeat("x", i)
    56  		gotBound, gotAdvance := BoundString(toyFace{}, s)
    57  		if gotBound != wantBound {
    58  			t.Errorf("i=%d: bound: got %v, want %v", i, gotBound, wantBound)
    59  		}
    60  		wantAdvance := toyAdvance * fixed.Int26_6(i)
    61  		if gotAdvance != wantAdvance {
    62  			t.Errorf("i=%d: advance: got %v, want %v", i, gotAdvance, wantAdvance)
    63  		}
    64  	}
    65  }
    66
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