mirror of https://github.com/mum4k/termdash.git
118 lines
3.3 KiB
Go
118 lines
3.3 KiB
Go
// Copyright 2019 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dotseg
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// attributes.go calculates attributes needed when determining placement of
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// segments.
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import (
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"fmt"
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"image"
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"math"
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"github.com/mum4k/termdash/align"
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"github.com/mum4k/termdash/private/alignfor"
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"github.com/mum4k/termdash/private/area"
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"github.com/mum4k/termdash/private/segdisp"
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"github.com/mum4k/termdash/private/segdisp/sixteen"
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)
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// attributes contains attributes needed to draw the segment display.
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// Refer to doc/segment_placement.svg for a visual aid and explanation of the
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// usage of the square roots.
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type attributes struct {
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// bcAr is the area the attributes were created for.
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bcAr image.Rectangle
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// segSize is the width of a vertical or height of a horizontal segment.
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segSize int
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// sixteen are attributes of a 16-segment display when placed on the same
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// area.
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sixteen *sixteen.Attributes
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}
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// newAttributes calculates attributes needed to place the segments for the
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// provided pixel area.
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func newAttributes(bcAr image.Rectangle) *attributes {
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segSize := segdisp.SegmentSize(bcAr)
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return &attributes{
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bcAr: bcAr,
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segSize: segSize,
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sixteen: sixteen.NewAttributes(bcAr),
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}
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}
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// segArea returns the area for the specified segment.
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func (a *attributes) segArea(seg Segment) (image.Rectangle, error) {
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// Dots have double width of normal segments to fill more space in the
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// segment display.
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segSize := a.segSize * 2
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// An area representing the dot which gets aligned and moved into position
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// below.
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dotAr := image.Rect(
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a.bcAr.Min.X,
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a.bcAr.Min.Y,
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a.bcAr.Min.X+segSize,
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a.bcAr.Min.Y+segSize,
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)
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mid, err := alignfor.Rectangle(a.bcAr, dotAr, align.HorizontalCenter, align.VerticalMiddle)
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if err != nil {
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return image.ZR, err
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}
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// moveBySize is the multiplier of segment size to determine by how many
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// pixels to move D1 and D2 up and down from the center.
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const moveBySize = 1.5
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moveBy := int(math.Round(moveBySize * float64(segSize)))
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switch seg {
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case D1:
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moved, err := area.MoveUp(mid, moveBy)
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if err != nil {
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return image.ZR, err
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}
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return moved, nil
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case D2:
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moved, err := area.MoveDown(mid, moveBy)
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if err != nil {
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return image.ZR, err
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}
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return moved, nil
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case D3:
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// Align at the middle of the bottom.
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bot, err := alignfor.Rectangle(a.bcAr, dotAr, align.HorizontalCenter, align.VerticalBottom)
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if err != nil {
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return image.ZR, err
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}
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// Shift up to where the sixteen segment actually places its bottom
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// segments.
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diff := bot.Min.Y - a.sixteen.VertBotY
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// Shift further up by one segment size, since the dots have double width.
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diff += a.segSize
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moved, err := area.MoveUp(bot, diff)
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if err != nil {
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return image.ZR, err
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}
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return moved, nil
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default:
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return image.ZR, fmt.Errorf("cannot calculate area for %v(%d)", seg, seg)
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}
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}
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