GOingTunneling/hud.go

package main

import "github.com/veandco/go-sdl2/sdl"

var letterOffsets = []int32{
	2,
	10,
	18,
}

var letterColors []uint32

// Map function to convert value from range [0, 6] to range [0, 88]
func mapRange(x, minX, maxX, minY, maxY uint32) int32 {
	// Perform conversion to float64 to ensure proper division
	return int32((float64(x-minX)/float64(maxX-minX))*float64(maxY-minY) + float64(minY))
}

var rects = [][]sdl.Rect{
	// Define the rects with modified Y-values
	{
		{X: 5, Y: 0, W: 6, H: 1},
		{X: 5, Y: 0, W: 1, H: 5},
		{X: 5, Y: 2, W: 6, H: 1},
		{X: 5, Y: 4, W: 6, H: 1},
	},

	{
		{X: 6, Y: 0, W: 4, H: 1},  // Top bar of "A"
		{X: 5, Y: 1, W: 1, H: 4},  // Left vertical line of "A"
		{X: 10, Y: 1, W: 1, H: 4}, // Right vertical line of "A"
		{X: 6, Y: 3, W: 4, H: 1},  // Middle bar of "A"
	},

	{
		{X: 5, Y: 0, W: 6, H: 1},
		{X: 5, Y: 0, W: 1, H: 3},
		{X: 5, Y: 2, W: 6, H: 1},
		{X: 10, Y: 2, W: 1, H: 3},
		{X: 5, Y: 4, W: 6, H: 1},
	},
}

func initHud(surface *sdl.Surface) {
	letterColors = []uint32{
		sdl.MapRGBA(surface.Format, 243, 235, 28, 255),
		sdl.MapRGBA(surface.Format, 255, 80, 40, 255),
		sdl.MapRGBA(surface.Format, 40, 243, 243, 255),
	}
	HUDColor := sdl.MapRGBA(surface.Format, 101, 101, 101, 255)
	_ = surface.FillRect(nil, HUDColor)

	for letterIndex, letter := range rects {
		for _, letterRect := range letter {
			offsetRect := letterRect
			offsetRect.Y += letterOffsets[letterIndex]
			_ = surface.FillRect(&offsetRect, letterColors[letterIndex])
		}
	}
}

func renderHud(player *Player, surface *sdl.Surface) {

	for _, letterOffset := range letterOffsets {
		_ = surface.FillRect(&sdl.Rect{X: 16, Y: letterOffset - 1, W: 90, H: 7}, 0)
	}

	HUDValues := []int32{
		mapRange(player.energy, 0, serverConfig.MaxEnergy, 0, 88),
		mapRange(player.ammunition, 0, serverConfig.MaxAmmunition, 0, 88),
		mapRange(player.shields, 0, serverConfig.MaxShields, 0, 88),
	}

	for HUDValueIndex, HUDValue := range HUDValues {
		_ = surface.FillRect(
			&sdl.Rect{
				X: 17,
				Y: letterOffsets[HUDValueIndex],
				W: HUDValue,
				H: 5},
			letterColors[HUDValueIndex])
	}
}