Example usage for org.lwjgl.opengl GL11 glBegin

Introduction

In this page you can find the example usage for org.lwjgl.opengl GL11 glBegin.

Prototype

public static native void glBegin(@NativeType("GLenum") int mode);

Source Link

Document

Begins the definition of vertex attributes of a sequence of primitives to be transferred to the GL.

Usage

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawBoxFilled(int x1, int y1, int x2, int y2, float r, float g, float b, float a) {
    GL11.glDisable(GL11.GL_TEXTURE_2D);/*  w ww. j a va  2s .co m*/
    GL11.glColor4f(r, g, b, a);

    x2++;
    y2++;

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glVertex2i(x1, y1);
    GL11.glVertex2i(x1, y2);
    GL11.glVertex2i(x2, y2);
    GL11.glVertex2i(x2, y1);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

    GL11.glColor4f(1, 1, 1, 1);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawBoxFilled(int x1, int y1, int x2, int y2) {
    GL11.glDisable(GL11.GL_TEXTURE_2D);//from   ww  w.  j a  v a  2s  .c  o  m

    x2++;
    y2++;

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glVertex2i(x1, y1);
    GL11.glVertex2i(x1, y2);
    GL11.glVertex2i(x2, y2);
    GL11.glVertex2i(x2, y1);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawEllipse(int x, int y, int a, int b, int degrees, float red, float green, float blue,
        float alpha) {

    // these constants decide the quality of the ellipse
    final float pi = (float) Math.PI;
    final float twopi = 2 * pi; //        two pi (radians in a circle)
    final int face_length = 8; //        approx. face length in pixels
    final int max_faces = 256; //        maximum number of faces in ellipse
    final int min_faces = 16; //        minimum number of faces in ellipse

    // approx. ellipse circumference (hudson's method)
    float h = (a - b * a - b) / (float) (a + b * a + b);
    float circumference = 0.25f * pi * (a + b) * (3 * (1 + h * 0.25f) + 1 / (1 - h * 0.25f));

    // number of faces in ellipse
    int num_faces = (int) (circumference / (float) face_length);

    // clamp number of faces
    if (num_faces > max_faces)
        num_faces = max_faces;/*from w  w w . j a v  a2s . c  om*/
    if (num_faces < min_faces)
        num_faces = min_faces;

    // keep number of faces divisible by 4
    num_faces -= (num_faces & 3);

    // precalc cosine theta
    float angle = degrees * pi / 180.0f;
    float s = (float) Math.sin(twopi / (float) num_faces);
    float c = (float) Math.cos(twopi / (float) num_faces);
    float xx = 1;
    float yy = 0;
    float xt;
    float ax = (float) Math.cos(angle);
    float ay = (float) Math.sin(angle);

    // draw ellipse
    GL11.glDisable(GL11.GL_TEXTURE_2D);
    GL11.glColor4f(red, green, blue, alpha);

    int i;
    GL11.glBegin(GL11.GL_LINE_LOOP);

    for (i = 0; i < num_faces; i++) {
        xt = xx;
        xx = c * xx - s * yy;
        yy = s * xt + c * yy;
        GL11.glVertex2f(x + a * xx * ax - b * yy * ay, y + a * xx * ay + b * yy * ax);
    }

    GL11.glVertex2f(x + a * ax, y + a * ay);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

    GL11.glColor4f(1, 1, 1, 1);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawEllipse(int x, int y, int a, int b, int degrees) {

    // these constants decide the quality of the ellipse
    final float pi = (float) Math.PI;
    final float twopi = 2 * pi; //        two pi (radians in a circle)
    final int face_length = 8; //        approx. face length in pixels
    final int max_faces = 256; //        maximum number of faces in ellipse
    final int min_faces = 16; //        minimum number of faces in ellipse

    // approx. ellipse circumference (hudson's method)
    float h = (a - b * a - b) / (float) (a + b * a + b);
    float circumference = 0.25f * pi * (a + b) * (3 * (1 + h * 0.25f) + 1 / (1 - h * 0.25f));

    // number of faces in ellipse
    int num_faces = (int) (circumference / (float) face_length);

    // clamp number of faces
    if (num_faces > max_faces)
        num_faces = max_faces;/*from w ww  .j a  v  a 2  s. c  om*/
    if (num_faces < min_faces)
        num_faces = min_faces;

    // keep number of faces divisible by 4
    num_faces -= (num_faces & 3);

    // precalc cosine theta
    float angle = degrees * pi / 180.0f;
    float s = (float) Math.sin(twopi / (float) num_faces);
    float c = (float) Math.cos(twopi / (float) num_faces);
    float xx = 1;
    float yy = 0;
    float xt;
    float ax = (float) Math.cos(angle);
    float ay = (float) Math.sin(angle);

    // draw ellipse
    GL11.glDisable(GL11.GL_TEXTURE_2D);

    int i;
    GL11.glBegin(GL11.GL_LINE_LOOP);

    for (i = 0; i < num_faces; i++) {
        xt = xx;
        xx = c * xx - s * yy;
        yy = s * xt + c * yy;
        GL11.glVertex2f(x + a * xx * ax - b * yy * ay, y + a * xx * ay + b * yy * ax);
    }

    GL11.glVertex2f(x + a * ax, y + a * ay);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawEllipseFilled(int x, int y, int a, int b, int degrees, float red, float green, float blue,
        float alpha) {

    // these constants decide the quality of the ellipse
    final float pi = (float) Math.PI;
    final float twopi = 2 * pi; //        two pi (radians in a circle)
    final int face_length = 8; //        approx. face length in pixels
    final int max_faces = 256; //        maximum number of faces in ellipse
    final int min_faces = 16; //        minimum number of faces in ellipse

    // approx. ellipse circumference (hudson's method)
    float h = (a - b * a - b) / (float) (a + b * a + b);
    float circumference = 0.25f * pi * (a + b) * (3 * (1 + h * 0.25f) + 1 / (1 - h * 0.25f));

    // number of faces in ellipse
    int num_faces = (int) (circumference / (float) face_length);

    // clamp number of faces
    if (num_faces > max_faces)
        num_faces = max_faces;/* w  w  w .  ja v  a2  s  .c om*/
    if (num_faces < min_faces)
        num_faces = min_faces;

    // keep number of faces divisible by 4
    num_faces -= (num_faces & 3);

    // precalc cosine theta
    float angle = degrees * pi / 180.0f;
    float s = (float) Math.sin(twopi / (float) num_faces);
    float c = (float) Math.cos(twopi / (float) num_faces);
    float xx = 1;
    float yy = 0;
    float xt;
    float ax = (float) Math.cos(angle);
    float ay = (float) Math.sin(angle);

    // draw ellipse
    GL11.glDisable(GL11.GL_TEXTURE_2D);
    GL11.glColor4f(red, green, blue, alpha);

    int i;
    GL11.glBegin(GL11.GL_TRIANGLE_FAN);

    for (i = 0; i < num_faces; i++) {
        xt = xx;
        xx = c * xx - s * yy;
        yy = s * xt + c * yy;
        GL11.glVertex2f(x + a * xx * ax - b * yy * ay, y + a * xx * ay + b * yy * ax);
    }

    GL11.glVertex2f(x + a * ax, y + a * ay);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

    GL11.glColor4f(1, 1, 1, 1);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

public void drawEllipseFilled(int x, int y, int a, int b, int degrees) {

    // these constants decide the quality of the ellipse
    final float pi = (float) Math.PI;
    final float twopi = 2 * pi; //        two pi (radians in a circle)
    final int face_length = 8; //        approx. face length in pixels
    final int max_faces = 256; //        maximum number of faces in ellipse
    final int min_faces = 16; //        minimum number of faces in ellipse

    // approx. ellipse circumference (hudson's method)
    float h = (a - b * a - b) / (float) (a + b * a + b);
    float circumference = 0.25f * pi * (a + b) * (3 * (1 + h * 0.25f) + 1 / (1 - h * 0.25f));

    // number of faces in ellipse
    int num_faces = (int) (circumference / (float) face_length);

    // clamp number of faces
    if (num_faces > max_faces)
        num_faces = max_faces;/*  ww w . j  a  va  2s.c  om*/
    if (num_faces < min_faces)
        num_faces = min_faces;

    // keep number of faces divisible by 4
    num_faces -= (num_faces & 3);

    // precalc cosine theta
    float angle = degrees * pi / 180.0f;
    float s = (float) Math.sin(twopi / (float) num_faces);
    float c = (float) Math.cos(twopi / (float) num_faces);
    float xx = 1;
    float yy = 0;
    float xt;
    float ax = (float) Math.cos(angle);
    float ay = (float) Math.sin(angle);

    // draw ellipse
    GL11.glDisable(GL11.GL_TEXTURE_2D);

    int i;
    GL11.glBegin(GL11.GL_TRIANGLE_FAN);

    for (i = 0; i < num_faces; i++) {
        xt = xx;
        xx = c * xx - s * yy;
        yy = s * xt + c * yy;
        GL11.glVertex2f(x + a * xx * ax - b * yy * ay, y + a * xx * ay + b * yy * ax);
    }

    GL11.glVertex2f(x + a * ax, y + a * ay);

    GL11.glEnd();

    GL11.glEnable(GL11.GL_TEXTURE_2D);

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

void drawSprite(float x, float y, int flipmode, SpriteGL sprite) {

    flipmode = getflipMode(flipmode);// www  . ja  v  a  2s .co m

    float x2 = x + sprite.width;
    float y2 = y + sprite.height;

    float u1 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u1 : sprite.u2;
    float v1 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v1 : sprite.v2;
    float u2 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u2 : sprite.u1;
    float v2 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v2 : sprite.v1;

    if (sprite.textureID != currentTexture) {
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, sprite.textureID);
        currentTexture = sprite.textureID;
    }

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glTexCoord2f(u1, v1);
    GL11.glVertex2f(x, y);
    GL11.glTexCoord2f(u1, v2);
    GL11.glVertex2f(x, y2);
    GL11.glTexCoord2f(u2, v2);
    GL11.glVertex2f(x2, y2);
    GL11.glTexCoord2f(u2, v1);
    GL11.glVertex2f(x2, y);

    GL11.glEnd();

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

private void drawSprite(float x, float y, float r, float g, float b, float a, int flipmode, SpriteGL sprite) {

    flipmode = getflipMode(flipmode);/*from   www.  j  a v  a 2s.c o  m*/

    float x2 = x + sprite.width;
    float y2 = y + sprite.height;

    float u1 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u1 : sprite.u2;
    float v1 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v1 : sprite.v2;
    float u2 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u2 : sprite.u1;
    float v2 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v2 : sprite.v1;

    if (sprite.textureID != currentTexture) {
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, sprite.textureID);
        currentTexture = sprite.textureID;
    }

    GL11.glColor4f(r, g, b, a);

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glTexCoord2f(u1, v1);
    GL11.glVertex2f(x, y);
    GL11.glTexCoord2f(u1, v2);
    GL11.glVertex2f(x, y2);
    GL11.glTexCoord2f(u2, v2);
    GL11.glVertex2f(x2, y2);
    GL11.glTexCoord2f(u2, v1);
    GL11.glVertex2f(x2, y);

    GL11.glEnd();

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

private void drawTransformedSprite(float x, float y, float angle, float scaleX, float scaleY, int flipmode,
        SpriteGL sprite) {//from  w  w  w . j a v  a  2s  .  co m

    flipmode = getflipMode(flipmode);

    float s_half_x = sprite.width / 2.0f;
    float s_half_y = sprite.height / 2.0f;

    float x1 = -s_half_x;
    float y1 = -s_half_y;

    float u1 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u1 : sprite.u2;
    float v1 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v1 : sprite.v2;
    float u2 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u2 : sprite.u1;
    float v2 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v2 : sprite.v1;

    if (sprite.textureID != currentTexture) {
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, sprite.textureID);
        currentTexture = sprite.textureID;
    }

    GL11.glPushMatrix();

    GL11.glTranslatef(x, y, 0.0f);
    GL11.glScalef(scaleX, scaleY, 1.0f);
    GL11.glRotatef(angle, 0.0f, 0.0f, 1.0f);

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glTexCoord2f(u1, v1);
    GL11.glVertex2f(x1, y1);
    GL11.glTexCoord2f(u1, v2);
    GL11.glVertex2f(x1, s_half_y);
    GL11.glTexCoord2f(u2, v2);
    GL11.glVertex2f(s_half_x, s_half_y);
    GL11.glTexCoord2f(u2, v1);
    GL11.glVertex2f(s_half_x, y1);

    GL11.glEnd();

    GL11.glPopMatrix();

}

---

From source file:net.phatcode.rel.multimedia.Graphics.java

License:Open Source License

private void drawTransformedSprite(float x, float y, float angle, float scaleX, float scaleY, float r, float g,
        float b, float a, int flipmode, SpriteGL sprite) {

    flipmode = getflipMode(flipmode);/*from  w  ww .j a va2s  .  com*/

    float s_half_x = sprite.width / 2.0f;
    float s_half_y = sprite.height / 2.0f;

    float x1 = -s_half_x;
    float y1 = -s_half_y;

    float u1 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u1 : sprite.u2;
    float v1 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v1 : sprite.v2;
    float u2 = ((flipmode & SpriteGL.FLIP_H) == 0) ? sprite.u2 : sprite.u1;
    float v2 = ((flipmode & SpriteGL.FLIP_V) == 0) ? sprite.v2 : sprite.v1;

    if (sprite.textureID != currentTexture) {
        GL11.glBindTexture(GL11.GL_TEXTURE_2D, sprite.textureID);
        currentTexture = sprite.textureID;
    }

    GL11.glColor4f(r, g, b, a);

    GL11.glPushMatrix();

    GL11.glTranslatef(x, y, 0.0f);
    GL11.glScalef(scaleX, scaleY, 1.0f);
    GL11.glRotatef(angle, 0.0f, 0.0f, 1.0f);

    GL11.glBegin(GL11.GL_QUADS);

    GL11.glTexCoord2f(u1, v1);
    GL11.glVertex2f(x1, y1);
    GL11.glTexCoord2f(u1, v2);
    GL11.glVertex2f(x1, s_half_y);
    GL11.glTexCoord2f(u2, v2);
    GL11.glVertex2f(s_half_x, s_half_y);
    GL11.glTexCoord2f(u2, v1);
    GL11.glVertex2f(s_half_x, y1);

    GL11.glEnd();

    GL11.glPopMatrix();

}

---

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