zorldo

Goofing around with Ebiten
git clone git://bsandro.tech/zorldo
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camera.go (718B)

      1 package main
      2 
      3 import (
      4 	"math"
      5 )
      6 
      7 type Camera struct {
      8 	x, y                float64 // current position (top left corner)
      9 	maxWidth, maxHeight float64 // global browsable area size
     10 	width, height       float64 // viewport size
     11 }
     12 
     13 func (cam *Camera) Init(width, height, maxWidth, maxHeight float64) {
     14 	cam.width = width
     15 	cam.height = height
     16 	cam.maxWidth = maxWidth - width
     17 	cam.maxHeight = maxHeight - height
     18 }
     19 
     20 func (cam *Camera) ChangeX(diff float64) {
     21 	if diff < 0 {
     22 		cam.x = math.Max(cam.x+diff, 0)
     23 	} else {
     24 		cam.x = math.Min(cam.x+diff, cam.maxWidth)
     25 	}
     26 }
     27 
     28 func (cam *Camera) ChangeY(diff float64) {
     29 	if diff < 0 {
     30 		cam.y = math.Max(cam.y+diff, 0)
     31 	} else {
     32 		cam.y = math.Min(cam.y+diff, cam.maxHeight)
     33 	}
     34 }