Java tutorial
/** * This class was created by <Vazkii>. It's distributed as * part of the Botania Mod. Get the Source Code in github: * https://github.com/Vazkii/Botania * * Botania is Open Source and distributed under the * Botania License: http://botaniamod.net/license.php * * File Created @ [Mar 31, 2015, 3:16:02 PM (GMT)] */ package vazkii.botania.client.core.handler; import java.awt.Color; import org.lwjgl.opengl.GL11; import net.minecraft.client.Minecraft; import net.minecraft.client.renderer.GlStateManager; import net.minecraft.client.renderer.Tessellator; import net.minecraft.client.renderer.vertex.DefaultVertexFormats; import net.minecraft.entity.Entity; import net.minecraft.item.ItemStack; import net.minecraft.tileentity.TileEntity; import net.minecraft.util.math.AxisAlignedBB; import net.minecraft.util.math.BlockPos; import net.minecraft.util.math.RayTraceResult; import net.minecraftforge.client.event.RenderWorldLastEvent; import net.minecraftforge.fml.common.eventhandler.SubscribeEvent; import vazkii.botania.api.subtile.ISubTileContainer; import vazkii.botania.api.subtile.RadiusDescriptor; import vazkii.botania.api.subtile.SubTileEntity; import vazkii.botania.common.Botania; import vazkii.botania.common.core.helper.PlayerHelper; import vazkii.botania.common.entity.EntityMagicLandmine; import vazkii.botania.common.item.ItemTwigWand; import vazkii.botania.common.item.ModItems; public final class BlockHighlightRenderHandler { private BlockHighlightRenderHandler() { } @SubscribeEvent public static void onWorldRenderLast(RenderWorldLastEvent event) { Minecraft mc = Minecraft.getMinecraft(); RayTraceResult pos = mc.objectMouseOver; GlStateManager.pushMatrix(); GlStateManager.disableTexture2D(); GL11.glPushAttrib(GL11.GL_LIGHTING_BIT); GlStateManager.disableLighting(); GlStateManager.enableBlend(); GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); boundTile: { if (Botania.proxy.isClientPlayerWearingMonocle() && pos != null && pos.entityHit == null) { BlockPos bPos = pos.getBlockPos(); ItemStack stackHeld = PlayerHelper.getFirstHeldItem(mc.thePlayer, ModItems.twigWand); if (stackHeld != null && ItemTwigWand.getBindMode(stackHeld)) { BlockPos coords = ItemTwigWand.getBoundTile(stackHeld); if (coords.getY() != -1) bPos = coords; } TileEntity tile = mc.theWorld.getTileEntity(bPos); if (tile == null || !(tile instanceof ISubTileContainer)) break boundTile; ISubTileContainer container = (ISubTileContainer) tile; SubTileEntity subtile = container.getSubTile(); if (subtile == null) break boundTile; RadiusDescriptor descriptor = subtile.getRadius(); if (descriptor == null) break boundTile; if (descriptor.isCircle()) renderCircle(descriptor.getSubtileCoords(), descriptor.getCircleRadius()); else renderRectangle(descriptor.getAABB(), true, null, (byte) 32); } } double offY = -1.0 / 16 + 0.005; for (Entity e : mc.theWorld.loadedEntityList) if (e instanceof EntityMagicLandmine) { BlockPos bpos = e.getPosition(); AxisAlignedBB aabb = new AxisAlignedBB(bpos).offset(0, offY, 0).expand(2.5, 0, 2.5); float gs = (float) (Math.sin(ClientTickHandler.total / 20) + 1) * 0.2F + 0.6F; int r = (int) (105 * gs); int g = (int) (25 * gs); int b = (int) (145 * gs); Color color = new Color(r, g, b); int alpha = 32; if (e.ticksExisted < 8) alpha *= Math.min((e.ticksExisted + event.getPartialTicks()) / 8F, 1F); else if (e.ticksExisted > 47) alpha *= Math.min(1F - (e.ticksExisted - 47 + event.getPartialTicks()) / 8F, 1F); renderRectangle(aabb, false, color, (byte) alpha); offY += 0.001; } GlStateManager.enableTexture2D(); GlStateManager.disableBlend(); GL11.glPopAttrib(); GlStateManager.popMatrix(); } private static void renderRectangle(AxisAlignedBB aabb, boolean inner, Color color, byte alpha) { double renderPosX, renderPosY, renderPosZ; try { renderPosX = (double) ClientMethodHandles.renderPosX_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); renderPosY = (double) ClientMethodHandles.renderPosY_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); renderPosZ = (double) ClientMethodHandles.renderPosZ_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); } catch (Throwable t) { return; } GlStateManager.pushMatrix(); GlStateManager.translate(aabb.minX - renderPosX, aabb.minY - renderPosY, aabb.minZ - renderPosZ); if (color == null) color = Color.getHSBColor(ClientTickHandler.ticksInGame % 200 / 200F, 0.6F, 1F); GL11.glColor4ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue(), alpha); double f = 1F / 16F; double x = aabb.maxX - aabb.minX - f; double z = aabb.maxZ - aabb.minZ - f; Tessellator tessellator = Tessellator.getInstance(); tessellator.getBuffer().begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION); tessellator.getBuffer().pos(x, f, f).endVertex(); tessellator.getBuffer().pos(f, f, f).endVertex(); tessellator.getBuffer().pos(f, f, z).endVertex(); tessellator.getBuffer().pos(x, f, z).endVertex(); tessellator.draw(); if (inner) { x += f; z += f; double f1 = f + f / 4F; GL11.glColor4ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue(), (byte) (alpha * 2)); tessellator.getBuffer().begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION); tessellator.getBuffer().pos(x, f1, 0).endVertex(); tessellator.getBuffer().pos(0, f1, 0).endVertex(); tessellator.getBuffer().pos(0, f1, z).endVertex(); tessellator.getBuffer().pos(x, f1, z).endVertex(); tessellator.draw(); } GL11.glColor4ub((byte) 255, (byte) 255, (byte) 255, (byte) 255); GlStateManager.popMatrix(); } private static void renderCircle(BlockPos center, double radius) { double renderPosX, renderPosY, renderPosZ; try { renderPosX = (double) ClientMethodHandles.renderPosX_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); renderPosY = (double) ClientMethodHandles.renderPosY_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); renderPosZ = (double) ClientMethodHandles.renderPosZ_getter .invokeExact(Minecraft.getMinecraft().getRenderManager()); } catch (Throwable t) { return; } GlStateManager.pushMatrix(); double x = center.getX() + 0.5; double y = center.getY(); double z = center.getZ() + 0.5; GlStateManager.translate(x - renderPosX, y - renderPosY, z - renderPosZ); int color = Color.HSBtoRGB(ClientTickHandler.ticksInGame % 200 / 200F, 0.6F, 1F); Color colorRGB = new Color(color); GL11.glColor4ub((byte) colorRGB.getRed(), (byte) colorRGB.getGreen(), (byte) colorRGB.getBlue(), (byte) 32); double f = 1F / 16F; int totalAngles = 360; int drawAngles = 360; int step = totalAngles / drawAngles; radius -= f; Tessellator tessellator = Tessellator.getInstance(); tessellator.getBuffer().begin(GL11.GL_TRIANGLE_FAN, DefaultVertexFormats.POSITION); tessellator.getBuffer().pos(0, f, 0).endVertex(); for (int i = 0; i < totalAngles + 1; i += step) { double rad = (totalAngles - i) * Math.PI / 180.0; double xp = Math.cos(rad) * radius; double zp = Math.sin(rad) * radius; tessellator.getBuffer().pos(xp, f, zp).endVertex(); } tessellator.getBuffer().pos(0, f, 0).endVertex(); tessellator.draw(); radius += f; double f1 = f + f / 4F; GL11.glColor4ub((byte) colorRGB.getRed(), (byte) colorRGB.getGreen(), (byte) colorRGB.getBlue(), (byte) 64); tessellator.getBuffer().begin(GL11.GL_TRIANGLE_FAN, DefaultVertexFormats.POSITION); tessellator.getBuffer().pos(0, f1, 0).endVertex(); for (int i = 0; i < totalAngles + 1; i += step) { double rad = (totalAngles - i) * Math.PI / 180.0; double xp = Math.cos(rad) * radius; double zp = Math.sin(rad) * radius; tessellator.getBuffer().pos(xp, f1, zp).endVertex(); } tessellator.getBuffer().pos(0, f1, 0).endVertex(); tessellator.draw(); GL11.glColor4ub((byte) 255, (byte) 255, (byte) 255, (byte) 255); GlStateManager.popMatrix(); } }