org.jogamp.glg2d.impl.gl2.LineDrawingVisitor.java Source code

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Here is the source code for org.jogamp.glg2d.impl.gl2.LineDrawingVisitor.java

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/*
 * Copyright 2013 Brandon Borkholder
 *
 * 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 org.jogamp.glg2d.impl.gl2;

import java.awt.BasicStroke;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;

import org.jogamp.glg2d.impl.BasicStrokeLineVisitor;

/**
 * Draws a line, as outlined by a {@link BasicStroke}. The current
 * implementation supports everything except dashes. This class draws a series
 * of quads for each line segment, joins corners and endpoints as appropriate.
 */
public class LineDrawingVisitor extends BasicStrokeLineVisitor {
    protected GLContext context;

    @Override
    public void setGLContext(GLContext ctx) {
        context = ctx;
    }

    @Override
    public void beginPoly(int windingRule) {
        /*
         * pen hangs down and to the right. See java.awt.Graphics
         */
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glPushMatrix();
        GL11.glTranslatef(0.5f, 0.5f, 0);

        super.beginPoly(windingRule);
    }

    @Override
    public void endPoly() {
        super.endPoly();

        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glPopMatrix();
    }

    @Override
    protected void drawBuffer() {
        vBuffer.drawBuffer(GL11.GL_TRIANGLE_STRIP);
    }
}