[Code] Neuen Beispielcode ergänzt

This commit is contained in:
Andre Meyering 2018-10-24 15:03:05 +02:00
parent ec4663e293
commit e12a6f70a1
5 changed files with 283 additions and 10 deletions

View file

@ -7,4 +7,14 @@ endif()
find_package(OpenGL REQUIRED) find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED) find_package(GLUT REQUIRED)
add_subdirectory(hello_world) add_executable (hello_world hello_world/helloWorld.c)
target_include_directories(hello_world PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
target_link_libraries(hello_world ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
add_executable (culling box/template_culling.c)
target_include_directories(culling PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
target_link_libraries(culling ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
add_executable (koordinatensystem box/template_koordinatensystemUndPunkte.c)
target_include_directories(koordinatensystem PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
target_link_libraries(koordinatensystem ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})

View file

@ -0,0 +1,84 @@
#include <GL/glut.h>
#include <string.h>
int width = 800;
int height = 600;
void init(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE);
glutInitWindowSize(width, height);
glutInitWindowPosition(100, 100);
glViewport(0,0,width,height);
glutCreateWindow("Culling");
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glOrtho(-2.0, 2.0,-2.0, 2.0, -2.0, 2.0);
gluLookAt(0.25,0.5,0.1,0,0,0,0,1,0);
////////////////////////////////////////////////////////////////////
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT);
////////////////////////////////////////////////////////////////////
}
void display(void)
{
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glBegin(GL_QUADS);
glColor3f(1.0f, 0.0f, 0.0f);
// FRONT
glVertex3f(-0.5f, -0.5f, 0.5f);
glVertex3f( 0.5f, -0.5f, 0.5f);
glVertex3f( 0.5f, 0.5f, 0.5f);
glVertex3f(-0.5f, 0.5f, 0.5f);
// BACK
glVertex3f(-0.5f, -0.5f, -0.5f);
glVertex3f(-0.5f, 0.5f, -0.5f);
glVertex3f( 0.5f, 0.5f, -0.5f);
glVertex3f( 0.5f, -0.5f, -0.5f);
glColor3f(0.0f, 1.0f, 0.0f);
// LEFT
glVertex3f(-0.5f, -0.5f, 0.5f);
glVertex3f(-0.5f, 0.5f, 0.5f);
glVertex3f(-0.5f, 0.5f, -0.5f);
glVertex3f(-0.5f, -0.5f, -0.5f);
// RIGHT
glVertex3f( 0.5f, -0.5f, -0.5f);
glVertex3f( 0.5f, 0.5f, -0.5f);
glVertex3f( 0.5f, 0.5f, 0.5f);
glVertex3f( 0.5f, -0.5f, 0.5f);
glColor3f(0.0f, 0.0f, 1.0f);
// BOTTOM
glVertex3f(-0.5f, -0.5f, 0.5f);
glVertex3f(-0.5f, -0.5f, -0.5f);
glVertex3f( 0.5f, -0.5f, -0.5f);
glVertex3f( 0.5f, -0.5f, 0.5f);
glEnd();
glFlush();
}
int main(int argc, char** argv)
{
init(argc, argv);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}

View file

@ -0,0 +1,184 @@
#include <GL/glut.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
#pragma warning(disable:4996)
#define PI 3.14159265358979323846
int width = 800;
int height = 600;
void init(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE);
glutInitWindowSize(width, height);
glutInitWindowPosition(100, 100);
glViewport(0, 0, width, height);
glutCreateWindow("Programmieruebung Kreis-Plotter");
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, width, 0, height);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_POINT_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void drawCoordinateSystem(float* origin, int xLength, int yLength, int numTicksX, int numTicksY, float minX, float maxX, float minY, float maxY) {
float xTickDistance = (float) xLength / (float) numTicksX;
float yTickDistance = (float) yLength / (float) numTicksY;
int k;
float j;
float resX, resY;
char label[10];
resX = (maxX - minX) / xLength;
resY = (maxY - minY) / yLength;
glColor3f(0.0, 0.0, 0.0);
/* drawing the coordinate system */
glBegin(GL_LINES);
// x axis
glVertex2f(origin[0], origin[1]);
glVertex2f(origin[0] + xLength, origin[1]);
// y axis
glVertex2f(origin[0], origin[1]);
glVertex2f(origin[0], origin[1] + yLength);
// arrow head at x axis
glVertex2f(origin[0] + xLength, origin[1]);
glVertex2f(origin[0] + xLength - 15, origin[1] - 10);
glVertex2f(origin[0] + xLength, origin[1]);
glVertex2f(origin[0] + xLength - 15, origin[1] + 10);
// arrow head at y axis
glVertex2f(origin[0], origin[1] + yLength);
glVertex2f(origin[0] - 10, origin[1] + yLength - 15);
glVertex2f(origin[0], origin[1] + yLength);
glVertex2f(origin[0] + 10, origin[1] + yLength - 15);
glEnd();
// drawing ticks at x axis
for (j = 0; j < xLength; j = j + xTickDistance) {
glBegin(GL_LINES);
glVertex2f(origin[0] + j, origin[1] - 5);
glVertex2f(origin[0] + j, origin[1] + 5);
glEnd();
sprintf(label, "%5.2f", minX + (j*resX));
glRasterPos2i((int) round(origin[0] + j - (8 * 5)), (int) round(origin[1] - 13 - 10));
for (k = 0; k < 5; k++) {
glutBitmapCharacter(GLUT_BITMAP_8_BY_13, label[k]);
}
}
// drawing ticks at y axis
for (j = 0; j < yLength; j = j + yTickDistance) {
glBegin(GL_LINES);
glVertex2f(origin[0] - 5, origin[1] + j);
glVertex2f(origin[0] + 5, origin[1] + j);
glEnd();
sprintf(label, "%5.2f", minY + (j*resY));
glRasterPos2i((int) round(origin[0] - (8 * 5) - 10), (int) round(origin[1] + j - 13 / 2));
for (k = 0; k < 5; k++) {
glutBitmapCharacter(GLUT_BITMAP_8_BY_13, label[k]);
}
}
}
void drawCircle(float origin[2], float center[2], float radius, GLint numPoints)
{
//////////////////////////////////////////////////////////////////////////////////////////////
// - calculate numPoints points on the surface of the circle with given center and radius
// hint: see circle equation in parametric form
// - position points in the coordinate system starting at given origin
// - draw the points by OpenGL commands
//////////////////////////////////////////////////////////////////////////////////////////////
}
void display(void)
{
int n;
int xTickDistance = 50;
int yTickDistance = 50;
int numPoints = 30;
float radius[] = { 50, 100, 150 };
float center[] = { 300, 200 };
float origin[] = { 100, 100 };
GLfloat c[] = { 0.0,0.0,0.0 };
int xLength = 600;
int yLength = 400;
float size = 2;
/* settings for the coordinate system */
int numTicksX = 6;
int numTicksY = 4;
float minX = 0;
float maxX = 600;
float minY = 0;
float maxY = 400;
/* clearing the background color */
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
drawCoordinateSystem(origin, xLength, yLength, numTicksX, numTicksY, minX, maxX, minY, maxY);
for (n = 0; n < 3; n++) {
///////////////////////////////////////////////////////////////////////////////
// - set the point size different for each loop iteration
// - set the color different for each loop iteration
//////////////////////////////////////////////////////////////////////////////
drawCircle(origin, center, radius[n], numPoints);
}
glFlush();
}
int main(int argc, char** argv)
{
init(argc, argv);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}

View file

@ -1,5 +0,0 @@
cmake_minimum_required (VERSION 3.8)
add_executable (hello_world helloWorld.c)
target_include_directories(hello_world PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS} )
target_link_libraries(hello_world ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} )

View file

@ -1,8 +1,8 @@
#include <GL/glut.h> #include <GL/glut.h>
#include <string.h> #include <string.h>
int width = 640; static int width = 640;
int height = 480; static int height = 480;
void init(int argc, char** argv) void init(int argc, char** argv)
{ {
@ -22,7 +22,7 @@ void init(int argc, char** argv)
void display(void) void display(void)
{ {
char* myText = "Hello World!"; char* myText = "Hello World!";
int j; unsigned long j;
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 0.0, 0.0); glColor3f(1.0, 0.0, 0.0);
@ -36,7 +36,7 @@ void display(void)
glColor3f(1.0, 1.0, 1.0); glColor3f(1.0, 1.0, 1.0);
glRasterPos2i((width / 2) - (width / 4) + 10, (height / 2) - (height / 4) + 10); glRasterPos2i((width / 2) - (width / 4) + 10, (height / 2) - (height / 4) + 10);
for (j = 0; j < strlen(myText); j++) { for (j = 0ul; j < strlen(myText); j++) {
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, myText[j]); glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, myText[j]);
} }