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measure.go
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measure.go
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/*
* Copyright (c) 2021 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package spx
import (
"fmt"
"image"
"strconv"
"strings"
"github.com/goplus/spx/internal/gdi"
"github.com/hajimehoshi/ebiten/v2"
)
const (
measureEdgeLen = 6
measureLineWidth = 2
measureTextMargin = 8
)
type measure struct {
size float64
x float64
y float64
heading float64
// computed properties
text string
color Color
cachedImg *ebiten.Image
svgLineStyle string
svgRotate string
svgSize int // size*scale + 0.5 + measureLineWidth
}
func newMeasure(v specsp) *measure {
size := v["size"].(float64)
scale := getSpcspVal(v, "scale", 1.0).(float64)
text := strconv.FormatFloat(size, 'f', 1, 64)
text = strings.TrimSuffix(text, ".0")
heading := getSpcspVal(v, "heading", 0.0).(float64)
svgSize := int(size*scale + 0.5 + measureLineWidth)
c, err := parseColor(getSpcspVal(v, "color", 0.0))
if err != nil {
panic(err)
}
return &measure{
heading: heading,
size: size,
text: text,
color: c,
x: v["x"].(float64),
y: v["y"].(float64),
svgLineStyle: fmt.Sprintf("stroke-width:%d;stroke:rgb(%d, %d, %d);", measureLineWidth, c.R, c.G, c.B),
svgRotate: fmt.Sprintf("rotate(%.1f %d %d)", heading, svgSize>>1, svgSize>>1),
svgSize: svgSize,
}
}
func getSpcspVal(ss specsp, key string, defaultVal ...interface{}) interface{} {
v, ok := ss[key]
if ok {
return v
}
if len(defaultVal) > 0 {
return defaultVal[0]
}
return v
}
func (m *measure) draw(dc drawContext) {
if m.cachedImg != nil {
screenW, screenH := dc.Size()
op := new(ebiten.DrawImageOptions)
x := float64((screenW-m.svgSize)>>1) + m.x
y := float64((screenH-m.svgSize)>>1) - m.y
op.GeoM.Translate(x, y)
dc.DrawImage(m.cachedImg, op)
return
}
// lines
lines, err := m.getLines()
if err != nil {
panic(err)
}
m.cachedImg = ebiten.NewImageFromImage(lines)
// text
render := gdi.NewTextRender(defaultFont, 0x80000, 0)
render.AddText(m.text)
textW, textH := render.Size()
x, y := m.getTextPos(textW, textH)
render.Draw(m.cachedImg, x, y, m.color, 0)
}
func (m *measure) getLines() (image.Image, error) {
size := m.svgSize
svg := gdi.NewSVG(size, size)
svg.Gtransform(m.svgRotate)
svg.Line((size+measureLineWidth)/2, 0, (size+measureLineWidth)/2, size, m.svgLineStyle)
svg.Line((size-measureEdgeLen)/2, 0, (size+measureEdgeLen)/2, 0, m.svgLineStyle)
svg.Line((size-measureEdgeLen)/2, size-measureLineWidth/2, (size+measureEdgeLen)/2, size-measureLineWidth/2, m.svgLineStyle)
svg.Gend()
svg.End()
return svg.ToImage()
}
func (m *measure) getTextPos(textW, textH int) (int, int) {
rotation := (int(m.heading)%360 + 360) % 360
center := m.svgSize / 2
switch {
case rotation == 0:
return center + measureTextMargin, center - textH/2 // right of center
case rotation == 90:
return center - textW/2, center - measureTextMargin - textH // above center
case rotation == 180:
return center - textW - measureTextMargin, center - textH/2 // left of center
case rotation == 270:
return center - textW/2, center + measureTextMargin // under center
case rotation > 0 && rotation <= 45:
return center + measureTextMargin, center + (measureTextMargin-textH)/2
case rotation > 45 && rotation < 90:
return center - (measureTextMargin+textW)/2, center - measureTextMargin - textH
case rotation > 90 && rotation <= 135:
return center + (measureTextMargin-textW)/2, center - measureTextMargin - textH
case rotation > 135 && rotation < 180:
return center - measureTextMargin - textW, center
case rotation > 180 && rotation <= 225:
return center - measureTextMargin - textW, center - textH
case rotation > 225 && rotation < 270:
return center - textW/3, center + measureTextMargin
case rotation > 270 && rotation <= 315:
return center - textW, center + measureTextMargin
default:
return center + measureTextMargin, center - textH
}
}
func (m *measure) hit(hc hitContext) (hr hitResult, ok bool) {
return
}