From 1ae0884a7376a87a2df4a77d1ba861cd58a4dda7 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 31 Oct 2018 23:13:52 +0100
Subject: controller: clean up GameContext a bit

---
 src/controller/gamecontext.ts | 19 +++++--------------
 src/view/renderer/Renderer.ts | 13 +++++++++++--
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/src/controller/gamecontext.ts b/src/controller/gamecontext.ts
index 76ca7cc..4d86abf 100644
--- a/src/controller/gamecontext.ts
+++ b/src/controller/gamecontext.ts
@@ -10,14 +10,6 @@ import { getJSON } from '../util';
 
 import { vec2 } from 'gl-matrix';
 
-function snapToGrid(out: vec2, a: vec2): void {
-	const res = 64;
-
-	vec2.scale(out, a, res);
-	vec2.round(out, out);
-	vec2.scale(out, out, 1 / res);
-}
-
 export class GameContext {
 	public static async load(renderer: Renderer): Promise<GameContext> {
 		const [
@@ -66,10 +58,7 @@ export class GameContext {
 	}
 
 	private updateTime(time: number): number {
-		let diff = 0;
-		if (this.time !== null)
-			diff = time - this.time;
-
+		const diff = this.time !== null ? time - this.time : 0;
 		this.time = time;
 
 		return diff;
@@ -78,8 +67,10 @@ export class GameContext {
 	private update(time: number): void {
 		const diff = this.updateTime(time);
 
-		vec2.scaleAndAdd(this.entityPos, this.entityPos, this.entityMovement, diff * this.speed);
-		snapToGrid(this.entityPos, this.entityPos);
+		if (vec2.sqrLen(this.entityMovement) > 0)
+			vec2.scaleAndAdd(this.entityPos, this.entityPos, this.entityMovement, diff * this.speed);
+		else
+			this.renderer.snapToGrid(this.entityPos, this.entityPos);
 	}
 
 	private render = (time: number) => {
diff --git a/src/view/renderer/Renderer.ts b/src/view/renderer/Renderer.ts
index 344bccf..75dc265 100644
--- a/src/view/renderer/Renderer.ts
+++ b/src/view/renderer/Renderer.ts
@@ -3,6 +3,8 @@ import { mat4, vec2 } from 'gl-matrix';
 import Shaders from './Shaders';
 
 export default class Renderer {
+	private readonly viewScale = 64;
+
 	private readonly gl: WebGLRenderingContext;
 	private readonly shaders: Shaders;
 
@@ -49,11 +51,12 @@ export default class Renderer {
 	}
 
 	public setCenter(v: vec2|number[]) {
-		vec2.copy(this.center, v);
+		this.snapToGrid(this.center, v);
 	}
 
 	public setTranslation(v: vec2|number[]) {
 		vec2.sub(this.translation, v, this.center);
+		this.snapToGrid(this.translation, this.translation);
 		this.gl.uniform2fv(this.shaders.translateLoc, this.translation);
 	}
 
@@ -63,6 +66,12 @@ export default class Renderer {
 		this.setTranslation([0, 0]);
 	}
 
+	public snapToGrid(out: vec2, a: vec2|number[]): void {
+		vec2.scale(out, a, this.viewScale);
+		vec2.round(out, out);
+		vec2.scale(out, out, 1 / this.viewScale);
+	}
+
 	private mkContext(): WebGLRenderingContext {
 		const gl = (
 			this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl')
@@ -81,7 +90,7 @@ export default class Renderer {
 		this.clear();
 
 		mat4.identity(this.viewport);
-		mat4.scale(this.viewport, this.viewport, [2 * 64 / w, -2 * 64 / h, 1.0]);
+		mat4.scale(this.viewport, this.viewport, [2 * this.viewScale / w, -2 * this.viewScale / h, 1.0]);
 		this.gl.uniformMatrix4fv(this.shaders.viewportLoc, false, this.viewport);
 	}
 }
-- 
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