Java tutorial
/** * Wrath Engine * Copyright (C) 2015 Trent Spears * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package wrath.client.graphics.gui; import org.lwjgl.opengl.GL11; import wrath.client.graphics.Color; import wrath.client.graphics.Renderable; import wrath.client.graphics.Texture; /** * Class to describe elements of the GUI. * @author Trent Spears */ public abstract class GuiElement implements Renderable { private Color color = Color.WHITE; private float w = 0, h = 0, x = 0, y = 0; private boolean resizable; private Texture texture; /** * Constructor of the GUI Element. * @param width The width, measured in OpenGL screen scale, of this GUI element. * @param height The height, measured in OpenGL screen scale, of this GUI element. * @param initx The X-coordinate of the top-left corner of this GUI element. * @param inity The Y-coordinate of the top-left corner of this GUI element. * @param resizable If true, the element can be resized by dragging a mouse. * @param texture The {@link wrath.client.graphics.Texture} to render over this GUI element. Can be null. */ protected GuiElement(float width, float height, float initx, float inity, boolean resizable, Texture texture) { this(width, height, initx, inity, resizable, texture, Color.WHITE); } /** * Constructor of the GUI Element. * @param width The width, measured in OpenGL screen scale, of this GUI element. * @param height The height, measured in OpenGL screen scale, of this GUI element. * @param initx The X-coordinate of the top-left corner of this GUI element. * @param inity The Y-coordinate of the top-left corner of this GUI element. * @param resizable If true, the element can be resized by dragging a mouse. * @param texture The {@link wrath.client.graphics.Texture} to render over this GUI element. Can be null. * @param color The {@link wrath.client.graphics.Color} of the element. */ protected GuiElement(float width, float height, float initx, float inity, boolean resizable, Texture texture, Color color) { this.w = width; this.h = height; this.x = initx; this.y = inity; this.resizable = resizable; if (color != null) this.color = color; this.texture = texture; } /** * Gets the {@link wrath.client.graphics.Color} of the element. * @return Returns the {@link wrath.client.graphics.Color} of the element. */ public Color getColor() { return color; } /** * Gets the height, measured in OpenGL screen scale, of this GUI element. * @return Returns the height, measured in OpenGL screen scale, of this GUI element. */ public float getHeight() { return h; } /** * Gets the X-coordinate of the top-left corner of this GUI element. * @return Returns the X-coordinate of the top-left corner of this GUI element. */ public float getTopLeftX() { return x; } /** * Gets the Y-coordinate of the top-left corner of this GUI element. * @return Returns the Y-coordinate of the top-left corner of this GUI element. */ public float getTopLeftY() { return y; } /** * Gets the width, measured in OpenGL screen scale, of this GUI element. * @return Returns the width, measured in OpenGL screen scale, of this GUI element. */ public float getWidth() { return w; } /** * Checks if the specified coordinates are within the bounds of this GUI element. * @param x The X coordinate of the screen. * @param y The Y coordinate of the screen. * @return If true, the specified coordinates are within this GUI element. */ public boolean isInBounds(float x, float y) { if (x < this.x || y > this.y) return false; if (x > this.x + this.w || y < this.y - this.h) return false; return true; } /** * Gets whether or not this element should be resize-able via dragging the mouse. * @return If true, the element can be resized by dragging a mouse. */ public boolean isResizable() { return resizable; } @Override public void renderSetup() { GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glDisable(GL11.GL_DEPTH_TEST | GL11.GL_BLEND); GL11.glDepthMask(false); if (texture != null) texture.bindTexture(); GL11.glBegin(GL11.GL_QUADS); } @Override public void render(boolean consolidated) { if (consolidated) renderSetup(); color.bindColor(); GL11.glTexCoord2f(0, 1); GL11.glVertex3f(x, y - h, 0); GL11.glTexCoord2f(1, 1); GL11.glVertex3f(x + w, y - h, 0); GL11.glTexCoord2f(1, 0); GL11.glVertex3f(x + w, y, 0); GL11.glTexCoord2f(0, 0); GL11.glVertex3f(x, y, 0); if (consolidated) renderStop(); } @Override public void renderStop() { GL11.glEnd(); color.unbindColor(); Texture.unbindTextures(); GL11.glDepthMask(true); GL11.glDisable(GL11.GL_BLEND); GL11.glEnable(GL11.GL_DEPTH_TEST); } /** * Sets the {@link wrath.client.graphics.Color} of the GUI element. * @param color The {@link wrath.client.graphics.Color} to render the GUI component in. */ public void setColor(Color color) { this.color = color; } /** * Changes the measurements of this GUI element. * @param width The width, measured in OpenGL screen scale, of this GUI element. * @param height The height, measured in OpenGL screen scale, of this GUI element. */ public void setDimensions(float width, float height) { this.w = width; this.h = height; } /** * Changes the position of this GUI element. * @param x The X coordinate of the screen. * @param y The Y coordinate of the screen. */ public void setPosition(float x, float y) { this.x = x; this.y = y; } }