imageview.go

// Copyright 2017 Hajime Hoshi
//
// 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 ui

import (
	"image"
	"math"

	"github.com/hajimehoshi/ebiten"

	"github.com/hajimehoshi/rpgsnack-runtime/internal/consts"
)

type ImageView struct {
	x      int
	y      int
	scale  float64
	image  *ebiten.Image
	filter ebiten.Filter
}

func NewImageView(x, y int, scale float64, image *ebiten.Image) *ImageView {
	return &ImageView{
		x:     x,
		y:     y,
		scale: scale,
		image: image,
	}
}

func (i *ImageView) SetFilter(filter ebiten.Filter) {
	i.filter = filter
}

func (i *ImageView) Region() image.Rectangle {
	w, h := i.image.Size()
	return image.Rect(i.x, i.y, i.x+int(math.Ceil(float64(w)*i.scale)), i.y+int(math.Ceil(float64(h)*i.scale)))
}

func (i *ImageView) Update() {
}

func (i *ImageView) HandleInput(offsetX, offsetY int) bool {
	return false
}

func (i *ImageView) Draw(screen *ebiten.Image) {
	i.DrawAsChild(screen, 0, 0)
}

func (i *ImageView) DrawAsChild(screen *ebiten.Image, offsetX, offsetY int) {
	op := &ebiten.DrawImageOptions{}
	op.GeoM.Scale(i.scale, i.scale)
	op.GeoM.Translate(float64(i.x+offsetX), float64(i.y+offsetY))
	op.GeoM.Scale(consts.TileScale, consts.TileScale)
	op.Filter = i.filter
	screen.DrawImage(i.image, op)
}