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Introduce min_scale config

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This commit is contained in:
Joaquín Rossi 2021-02-21 23:44:52 -03:00
parent 3e8c24a4a4
commit 71bacc7ad5
3 changed files with 7 additions and 1 deletions
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1
README.md
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@ -68,6 +68,7 @@ Supported parameters:
| Name | Description |
|----------------|----------------------------------------------------|
| min_scale | The smallest it can get when zooming out |
| scroll_speed | How quickly you can zoom in/out by scrolling |
| drag_friction | How quickly the movement slows down after dragging |
| scale_friction | How quickly the zoom slows down after scrolling |

5
src/config.nim
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@ -1,11 +1,13 @@
import macros, strutils
type Config* = object
min_scale*: float
scroll_speed*: float
drag_friction*: float
scale_friction*: float
const defaultConfig* = Config(
min_scale: 1,
scroll_speed: 1.5,
drag_friction: 6.0,
scale_friction: 4.0,
@ -21,6 +23,8 @@ proc loadConfig*(filePath: string): Config =
let key = pair[0].strip
let value = pair[1].strip
case key
of "min_scale":
result.min_scale = parseFloat(value)
of "scroll_speed":
result.scroll_speed = parseFloat(value)
of "drag_friction":
@ -33,6 +37,7 @@ proc loadConfig*(filePath: string): Config =
proc generateDefaultConfig*(filePath: string) =
var f = open(filePath, fmWrite)
defer: f.close
f.write("min_scale = ", defaultConfig.min_scale, "\n")
f.write("scroll_speed = ", defaultConfig.scroll_speed, "\n")
f.write("drag_friction = ", defaultConfig.drag_friction, "\n")
f.write("scale_friction = ", defaultConfig.scale_friction, "\n")

2
src/navigation.nim
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@ -23,7 +23,7 @@ proc world*(camera: Camera, v: Vec2f): Vec2f =
proc update*(camera: var Camera, config: Config, dt: float, mouse: Mouse, image: PXImage, windowSize: Vec2f) =
if abs(camera.deltaScale) > 0.5:
let p0 = (camera.scalePivot - (windowSize * 0.5)) / camera.scale
camera.scale = max(camera.scale + camera.delta_scale * dt, 0.01)
camera.scale = max(camera.scale + camera.delta_scale * dt, config.min_scale)
let p1 = (camera.scalePivot - (windowSize * 0.5)) / camera.scale
camera.position += p0 - p1