More work

.gitignore

@@ -21,3 +21,5 @@ _testmain.go
 
 *.exe
 gopher-battle
+
+gopher-battle.log

screen_main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"math"
 	"math/rand"
 	"time"
 
@@ -27,7 +28,7 @@ type mainScreen struct {
 	PauseMenu  *termboxUtil.Menu
 	r          *rand.Rand
 	animating  bool
-	gravity    float32
+	gravity    float64
 }
 
 func (screen *mainScreen) handleKeyPress(event termbox.Event) int {
@@ -55,14 +56,18 @@ func (screen *mainScreen) handleKeyPress(event termbox.Event) int {
 	if screen.GameMode == modeRunInput {
 		if event.Key == termbox.KeySpace {
 			if screen.PlayerTurn == 1 {
+				screen.Bullet.launchTime = time.Now()
 				screen.Bullet.angle = screen.Player1.projAngle
 				screen.Bullet.speed = screen.Player1.projSpeed
-				screen.Bullet.x, screen.Bullet.y = screen.Player1.GetBulletHandPos()
+				screen.Bullet.startX, screen.Bullet.startY = screen.Player1.GetBulletHandPos()
 			} else {
+				screen.Bullet.launchTime = time.Now()
 				screen.Bullet.angle = 180 - screen.Player2.projAngle
 				screen.Bullet.speed = screen.Player2.projSpeed
-				screen.Bullet.x, screen.Bullet.y = screen.Player2.GetBulletHandPos()
+				screen.Bullet.startX, screen.Bullet.startY = screen.Player2.GetBulletHandPos()
 			}
+			screen.Bullet.x = screen.Bullet.startX
+			screen.Bullet.y = screen.Bullet.startY
 			screen.animating = true
 			screen.GameMode = modeRun
 		} else if event.Key == termbox.KeyArrowLeft || event.Ch == 'a' {
@@ -87,15 +92,21 @@ func (screen *mainScreen) handleKeyPress(event termbox.Event) int {
 			}
 		} else if event.Key == termbox.KeyArrowUp || event.Ch == 'w' {
 			if screen.PlayerTurn == 1 {
+				// TODO: Upper speed limit
 				screen.Player1.projSpeed++
 			} else {
+				// TODO: Upper speed limit
 				screen.Player2.projSpeed++
 			}
 		} else if event.Key == termbox.KeyArrowDown || event.Ch == 's' {
 			if screen.PlayerTurn == 1 {
-				screen.Player1.projSpeed--
+				if screen.Player1.projSpeed > 0 {
+					screen.Player1.projSpeed--
+				}
 			} else {
-				screen.Player2.projSpeed--
+				if screen.Player2.projSpeed > 0 {
+					screen.Player2.projSpeed--
+				}
 			}
 		}
 	}
@@ -105,7 +116,9 @@ func (screen *mainScreen) handleKeyPress(event termbox.Event) int {
 func (screen *mainScreen) performLayout(style style) {
 	var bldCity int
 	if screen.GameMode == modeInit {
-		b := projectile{}
+		// Default screen gravity:
+		screen.gravity = float64(-9.81)
+		b := projectile{gravity: screen.gravity}
 		screen.Bullet = &b
 		// TODO: Reset Buildings
 		//screen.Buildings = []building{}
@@ -165,20 +178,9 @@ func (screen *mainScreen) update() {
 		if !screen.animating {
 			screen.GameMode = modeRunInput
 		} else {
-			if screen.Bullet.x > 0 && screen.Bullet.x < ScreenWidth {
-				// Figure out where the bullet should move to based
-				// on its angle and speed
-				if screen.Bullet.angle < 35 {
-					screen.Bullet.x++
-				} else if screen.Bullet.angle < 90 {
-					screen.Bullet.x++
-					screen.Bullet.y++
-				} else if screen.Bullet.angle < 125 {
-					screen.Bullet.x--
-					screen.Bullet.y--
-				} else {
-					screen.Bullet.x--
-				}
+			if screen.Bullet.x > 0 && screen.Bullet.x < ScreenWidth && screen.Bullet.y < ScreenHeight && screen.Bullet.y > -5000 {
+				screen.Bullet.update()
+				// Check for collisions
 			} else {
 				// Bullet went off the sides of the screen
 				screen.animating = false
@@ -245,9 +247,29 @@ func getSeedFromString(seed string) int64 {
 	return ret
 }
 
+func degToRad(d int) float64 {
+	return (float64(d) * (math.Pi / float64(180)))
+}
+
 type projectile struct {
-	x, y         int
-	speed, angle int
+	x, y           int
+	startX, startY int
+	speed, angle   int
+	gravity        float64
+	launchTime     time.Time
+}
+
+func (p *projectile) update() {
+	// On an update we increase the tick
+	tm := time.Since(p.launchTime).Seconds()
+	useSpeed := float64(p.speed)
+	useX, useY := float64(p.startX), float64(p.startY)
+	halfG := 0.5 * p.gravity
+	p.x = int(useX + (useSpeed * tm))
+	p.y = int(useY + (useSpeed * tm) - (halfG * tm * tm))
+	//p.x = int(useX + (math.Cos(degToRad(p.angle)) * useSpeed * tm))
+	//p.y = int(useY + (math.Sin(degToRad(p.angle)) * useSpeed * tm * halfG * tm * tm))
+	WriteToLog(fmt.Sprintf("(%d) %d,%d (s:%d;a:%d)\n", tm, p.x, p.y, useSpeed, p.angle))
 }
 
 func (p *projectile) draw() {