/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package com.badlogic.gdx.utils.viewport;
import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.Camera;
import com.badlogic.gdx.graphics.glutils.HdpiUtils;
import com.badlogic.gdx.math.Matrix4;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.math.collision.Ray;
import com.badlogic.gdx.scenes.scene2d.utils.ScissorStack;
/** Manages a {@link Camera} and determines how world coordinates are mapped to and from the screen.
* @author Daniel Holderbaum
* @author Nathan Sweet */
public abstract class Viewport {
private Camera camera;
private float worldWidth, worldHeight;
private int screenX, screenY, screenWidth, screenHeight;
private final Vector3 tmp = new Vector3();
/** Calls {@link #apply(boolean)} with false. */
public void apply () {
apply(false);
}
/** Applies the viewport to the camera and sets the glViewport.
* @param centerCamera If true, the camera position is set to the center of the world. */
public void apply (boolean centerCamera) {
HdpiUtils.glViewport(screenX, screenY, screenWidth, screenHeight);
camera.viewportWidth = worldWidth;
camera.viewportHeight = worldHeight;
if (centerCamera) camera.position.set(worldWidth / 2, worldHeight / 2, 0);
camera.update();
}
/** Calls {@link #update(int, int, boolean)} with false. */
public final void update (int screenWidth, int screenHeight) {
update(screenWidth, screenHeight, false);
}
/** Configures this viewport's screen bounds using the specified screen size and calls {@link #apply(boolean)}. Typically called
* from {@link ApplicationListener#resize(int, int)} or {@link Screen#resize(int, int)}.
* <p>
* The default implementation only calls {@link #apply(boolean)}. */
public void update (int screenWidth, int screenHeight, boolean centerCamera) {
apply(centerCamera);
}
/** Transforms the specified screen coordinate to world coordinates.
* @return The vector that was passed in, transformed to world coordinates.
* @see Camera#unproject(Vector3) */
public Vector2 unproject (Vector2 screenCoords) {
tmp.set(screenCoords.x, screenCoords.y, 1);
camera.unproject(tmp, screenX, screenY, screenWidth, screenHeight);
screenCoords.set(tmp.x, tmp.y);
return screenCoords;
}
/** Transforms the specified world coordinate to screen coordinates.
* @return The vector that was passed in, transformed to screen coordinates.
* @see Camera#project(Vector3) */
public Vector2 project (Vector2 worldCoords) {
tmp.set(worldCoords.x, worldCoords.y, 1);
camera.project(tmp, screenX, screenY, screenWidth, screenHeight);
worldCoords.set(tmp.x, tmp.y);
return worldCoords;
}
/** Transforms the specified screen coordinate to world coordinates.
* @return The vector that was passed in, transformed to world coordinates.
* @see Camera#unproject(Vector3) */
public Vector3 unproject (Vector3 screenCoords) {
camera.unproject(screenCoords, screenX, screenY, screenWidth, screenHeight);
return screenCoords;
}
/** Transforms the specified world coordinate to screen coordinates.
* @return The vector that was passed in, transformed to screen coordinates.
* @see Camera#project(Vector3) */
public Vector3 project (Vector3 worldCoords) {
camera.project(worldCoords, screenX, screenY, screenWidth, screenHeight);
return worldCoords;
}
/** @see Camera#getPickRay(float, float, float, float, float, float) */
public Ray getPickRay (float screenX, float screenY) {
return camera.getPickRay(screenX, screenY, this.screenX, this.screenY, screenWidth, screenHeight);
}
/** @see ScissorStack#calculateScissors(Camera, float, float, float, float, Matrix4, Rectangle, Rectangle) */
public void calculateScissors (Matrix4 batchTransform, Rectangle area, Rectangle scissor) {
ScissorStack.calculateScissors(camera, screenX, screenY, screenWidth, screenHeight, batchTransform, area, scissor);
}
/** Transforms a point to real screen coordinates (as opposed to OpenGL ES window coordinates), where the origin is in the top
* left and the the y-axis is pointing downwards. */
public Vector2 toScreenCoordinates (Vector2 worldCoords, Matrix4 transformMatrix) {
tmp.set(worldCoords.x, worldCoords.y, 0);
tmp.mul(transformMatrix);
camera.project(tmp);
tmp.y = Gdx.graphics.getHeight() - tmp.y;
worldCoords.x = tmp.x;
worldCoords.y = tmp.y;
return worldCoords;
}
public Camera getCamera () {
return camera;
}
public void setCamera (Camera camera) {
this.camera = camera;
}
public float getWorldWidth () {
return worldWidth;
}
/** The virtual width of this viewport in world coordinates. This width is scaled to the viewport's screen width. */
public void setWorldWidth (float worldWidth) {
this.worldWidth = worldWidth;
}
public float getWorldHeight () {
return worldHeight;
}
/** The virtual height of this viewport in world coordinates. This height is scaled to the viewport's screen height. */
public void setWorldHeight (float worldHeight) {
this.worldHeight = worldHeight;
}
public void setWorldSize (float worldWidth, float worldHeight) {
this.worldWidth = worldWidth;
this.worldHeight = worldHeight;
}
public int getScreenX () {
return screenX;
}
/** Sets the viewport's offset from the left edge of the screen. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenX (int screenX) {
this.screenX = screenX;
}
public int getScreenY () {
return screenY;
}
/** Sets the viewport's offset from the bottom edge of the screen. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenY (int screenY) {
this.screenY = screenY;
}
public int getScreenWidth () {
return screenWidth;
}
/** Sets the viewport's width in screen coordinates. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenWidth (int screenWidth) {
this.screenWidth = screenWidth;
}
public int getScreenHeight () {
return screenHeight;
}
/** Sets the viewport's height in screen coordinates. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenHeight (int screenHeight) {
this.screenHeight = screenHeight;
}
/** Sets the viewport's position in screen coordinates. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenPosition (int screenX, int screenY) {
this.screenX = screenX;
this.screenY = screenY;
}
/** Sets the viewport's size in screen coordinates. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenSize (int screenWidth, int screenHeight) {
this.screenWidth = screenWidth;
this.screenHeight = screenHeight;
}
/** Sets the viewport's bounds in screen coordinates. This is typically set by {@link #update(int, int, boolean)}. */
public void setScreenBounds (int screenX, int screenY, int screenWidth, int screenHeight) {
this.screenX = screenX;
this.screenY = screenY;
this.screenWidth = screenWidth;
this.screenHeight = screenHeight;
}
/** Returns the left gutter (black bar) width in screen coordinates. */
public int getLeftGutterWidth () {
return screenX;
}
/** Returns the right gutter (black bar) x in screen coordinates. */
public int getRightGutterX () {
return screenX + screenWidth;
}
/** Returns the right gutter (black bar) width in screen coordinates. */
public int getRightGutterWidth () {
return Gdx.graphics.getWidth() - (screenX + screenWidth);
}
/** Returns the bottom gutter (black bar) height in screen coordinates. */
public int getBottomGutterHeight () {
return screenY;
}
/** Returns the top gutter (black bar) y in screen coordinates. */
public int getTopGutterY () {
return screenY + screenHeight;
}
/** Returns the top gutter (black bar) height in screen coordinates. */
public int getTopGutterHeight () {
return Gdx.graphics.getHeight() - (screenY + screenHeight);
}
}