fixed stuff

js/Texture.js

 		ctx.drawImage(this.can, x, y, this.width, this.height);
 	}
 }
-
-Texture.fromLine = function(l, m, r, lr) {
-}

js/entities/Platform.js

 
 import TPlatform from "../traits/TPlatform.js";
 import TCollider from "../traits/TCollider.js";
+import TPhysics from "../traits/TPhysics.js";
 
 export default class Platform extends Entity {
 	constructor(level) {
 		this.bounds.size.set(5, 1);
 		this.addTrait(new TCollider(this));
 		this.addTrait(new TPlatform(this));
+		this.addTrait(new TPhysics(this));
+	}
+
+	update(dt) {
+		let phys = this.t.physics;
+		phys.velocity.y -= phys.gravity * dt;
 	}
 
 	draw(ctx) {

js/traits/TKeyboardController.js

 		let speed = phys.onGround ? this.speed : this.speedAir;
 
 		if (this.pressed.left)
-			phys.relVelocity.x -= speed * dt;
+			phys.velocity.x -= speed * dt;
 		if (this.pressed.right)
-			phys.relVelocity.x += speed * dt;
+			phys.velocity.x += speed * dt;
 		if (phys.onGround && this.pressed.jump) {
-			phys.relVelocity.y -= this.jump;
+			phys.velocity.y = -this.jump;
+			console.log("jumping to", phys.velocity.y);
 			this.jumpTime = this.jumpTimeMax;
 			this.jumping = true;
 			phys.onGround = false;
 			this.jumping = false;
 
 		if (this.jumping) {
-			phys.relVelocity.y -= this.updrift * this.jumpTime * dt;
+			phys.velocity.y -= this.updrift * this.jumpTime * dt;
 			this.jumpTime -= dt;
 		}
 	}

js/traits/TPhysics.js

 		this.groundFriction = 6;
 		this.airFriction = 2;
 
+		this.absVelocity = new Vec2();
 		this.velocity = new Vec2();
-		this.relVelocity = new Vec2();
 
 		this.onGround = false;
 		this.prevRelativeTo = null;
 		if (
 				this.entity.has("collider") &&
 				collider.collides &&
-				this.relVelocity.y >= 0) {
+				this.velocity.y >= 0) {
 
 			// Structures are static; just teleport us to the top of them
 			if (collider.cStructure) {
-				this.relVelocity.y = 0;
+				this.velocity.y = 0;
 				this.entity.bounds.bottom = collider.cStructure.top;
 				this.onGround = true;
 
 			// If we're colliding with an entity, and that entity is
 			// a platform, teleport us to the top of them.
 			} else if (collider.cEntity.has("platform")) {
-				this.relVelocity.y = 0;
+				this.velocity.y = 0;
 				this.entity.bounds.bottom = collider.cEntity.bounds.top;
 				this.onGround = true;
 
 		}
 
 		if (!this.onGround)
-			this.relVelocity.y += this.gravity * dt;
+			this.velocity.y += this.gravity * dt;
 
-		// If we just started riding something, adjust relative velocity
+		// If we just started riding something, adjust relative absVelocity
 		if (!this.prevRelativeTo && this.relativeTo) {
-			this.relVelocity.x = this.velocity.x - this.relativeTo.velocity.x;
-			this.relVelocity.y = this.velocity.y - this.relativeTo.velocity.y;
+			this.velocity.x = this.absVelocity.x - this.relativeTo.absVelocity.x;
+			this.velocity.y = this.absVelocity.y - this.relativeTo.absVelocity.y;
 
-		// If we just stopped riding something, adjust relative velocity
+		// If we just stopped riding something, adjust relative absVelocity
 		} else if (this.prevRelativeTo && !this.relativeTo) {
-			this.relVelocity.x = this.velocity.x + this.relativeTo.velocity.x;
-			this.relVelocity.y = this.velocity.y + this.relativeTo.velocity.y;
+			this.velocity.x += this.prevRelativeTo.absVelocity.x;
+			this.velocity.y += this.prevRelativeTo.absVelocity.y;
 		}
 
 		// Apply friction
 		var fric = this.onGround ? this.groundFriction : this.airFriction;
 		var xRatio = 1 / (1 + (dt * fric));
-		this.relVelocity.x *= xRatio;
+		this.velocity.x *= xRatio;
+	}
+
+	postUpdate(dt) {
 
-		// Update velocity
+		// Update absVelocity
 		if (this.relativeTo) {
-			this.velocity.x = this.relVelocity.x + this.relativeTo.velocity.x;
-			this.velocity.y = this.relVelocity.y + this.relativeTo.velocity.y;
+			this.absVelocity.x = this.velocity.x + this.relativeTo.absVelocity.x;
+			this.absVelocity.y = this.velocity.y + this.relativeTo.absVelocity.y;
 		} else {
-			this.velocity.x = this.relVelocity.x;
-			this.velocity.y = this.relVelocity.y;
+			this.absVelocity.x = this.velocity.x;
+			this.absVelocity.y = this.velocity.y;
 		}
-	}
 
-	postUpdate(dt) {
-		this.entity.bounds.pos.x += this.velocity.x * dt;
-		this.entity.bounds.pos.y += this.velocity.y * dt;
+		// Move
+		this.entity.bounds.pos.x += this.absVelocity.x * dt;
+		this.entity.bounds.pos.y += this.absVelocity.y * dt;
 	}
 }