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camera.go
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camera.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 (
"log"
"github.com/goplus/spx/internal/camera"
"github.com/goplus/spx/internal/math32"
"github.com/hajimehoshi/ebiten/v2"
)
type Camera struct {
freecamera camera.FreeCamera
g *Game
on_ interface{}
}
func (c *Camera) init(g *Game, winW, winH float64, worldW, worldH float64) {
c.freecamera = *camera.NewFreeCamera(winW, winH, worldW, worldH)
c.g = g
}
func (c *Camera) isWorldRange(pos *math32.Vector2) bool {
return c.freecamera.IsWorldRange(pos)
}
func (c *Camera) SetXYpos(x float64, y float64) {
c.on_ = nil
c.freecamera.MoveTo(x, y)
}
func (c *Camera) ChangeXYpos(x float64, y float64) {
c.on_ = nil
c.freecamera.Move(x, y)
}
func (c *Camera) screenToWorld(point *math32.Vector2) *math32.Vector2 {
return c.freecamera.ScreenToWorld(point)
}
/* unused:
func (c *Camera) worldToScreen(point *math32.Vector2) *math32.Vector2 {
return c.freecamera.WorldToScreen(point)
}
*/
func (c *Camera) On(obj interface{}) {
switch v := obj.(type) {
case string:
sp := c.g.findSprite(v)
if sp == nil {
log.Println("Camera.On: sprite not found -", v)
return
}
obj = sp
case *Sprite:
case nil:
case Spriter:
obj = spriteOf(v)
case specialObj:
if v != Mouse {
log.Println("Camera.On: not support -", v)
return
}
default:
panic("Camera.On: unexpected parameter")
}
c.on_ = obj
}
func (c *Camera) updateOnObj() {
switch v := c.on_.(type) {
case *Sprite:
cx, cy := v.getXY()
c.freecamera.MoveTo(cx, cy)
case nil:
case specialObj:
cx := c.g.MouseX()
cy := c.g.MouseY()
c.freecamera.MoveTo(cx, cy)
}
}
func (c *Camera) render(world, screen *ebiten.Image) error {
c.updateOnObj()
c.freecamera.Render(world, screen)
return nil
}