[Code] Neuen Beispielcode ergänzt
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5 changed files with 283 additions and 10 deletions
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@ -7,4 +7,14 @@ endif()
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find_package(OpenGL REQUIRED)
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find_package(GLUT REQUIRED)
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add_subdirectory(hello_world)
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add_executable (hello_world hello_world/helloWorld.c)
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target_include_directories(hello_world PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
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target_link_libraries(hello_world ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
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add_executable (culling box/template_culling.c)
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target_include_directories(culling PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
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target_link_libraries(culling ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
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add_executable (koordinatensystem box/template_koordinatensystemUndPunkte.c)
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target_include_directories(koordinatensystem PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
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target_link_libraries(koordinatensystem ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
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84
Code/box/template_culling.c
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84
Code/box/template_culling.c
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@ -0,0 +1,84 @@
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#include <GL/glut.h>
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#include <string.h>
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int width = 800;
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int height = 600;
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void init(int argc, char** argv) {
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE);
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glutInitWindowSize(width, height);
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glutInitWindowPosition(100, 100);
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glViewport(0,0,width,height);
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glutCreateWindow("Culling");
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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glOrtho(-2.0, 2.0,-2.0, 2.0, -2.0, 2.0);
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gluLookAt(0.25,0.5,0.1,0,0,0,0,1,0);
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////////////////////////////////////////////////////////////////////
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glEnable(GL_CULL_FACE);
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glCullFace(GL_FRONT);
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////////////////////////////////////////////////////////////////////
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}
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void display(void)
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{
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glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LEQUAL);
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glBegin(GL_QUADS);
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glColor3f(1.0f, 0.0f, 0.0f);
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// FRONT
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glVertex3f(-0.5f, -0.5f, 0.5f);
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glVertex3f( 0.5f, -0.5f, 0.5f);
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glVertex3f( 0.5f, 0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, 0.5f);
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// BACK
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glVertex3f(-0.5f, -0.5f, -0.5f);
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glVertex3f(-0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, -0.5f, -0.5f);
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glColor3f(0.0f, 1.0f, 0.0f);
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// LEFT
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glVertex3f(-0.5f, -0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, 0.5f);
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glVertex3f(-0.5f, 0.5f, -0.5f);
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glVertex3f(-0.5f, -0.5f, -0.5f);
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// RIGHT
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glVertex3f( 0.5f, -0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, -0.5f);
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glVertex3f( 0.5f, 0.5f, 0.5f);
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glVertex3f( 0.5f, -0.5f, 0.5f);
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glColor3f(0.0f, 0.0f, 1.0f);
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// BOTTOM
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glVertex3f(-0.5f, -0.5f, 0.5f);
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glVertex3f(-0.5f, -0.5f, -0.5f);
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glVertex3f( 0.5f, -0.5f, -0.5f);
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glVertex3f( 0.5f, -0.5f, 0.5f);
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glEnd();
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glFlush();
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}
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int main(int argc, char** argv)
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{
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init(argc, argv);
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glutDisplayFunc(display);
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glutMainLoop();
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return 0;
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}
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184
Code/box/template_koordinatensystemUndPunkte.c
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184
Code/box/template_koordinatensystemUndPunkte.c
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@ -0,0 +1,184 @@
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#include <GL/glut.h>
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#include <string.h>
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#include <math.h>
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#include <stdio.h>
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#pragma warning(disable:4996)
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#define PI 3.14159265358979323846
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int width = 800;
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int height = 600;
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void init(int argc, char** argv) {
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE);
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glutInitWindowSize(width, height);
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glutInitWindowPosition(100, 100);
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glViewport(0, 0, width, height);
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glutCreateWindow("Programmieruebung Kreis-Plotter");
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(0, width, 0, height);
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glMatrixMode(GL_MODELVIEW);
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glEnable(GL_POINT_SMOOTH);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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}
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void drawCoordinateSystem(float* origin, int xLength, int yLength, int numTicksX, int numTicksY, float minX, float maxX, float minY, float maxY) {
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float xTickDistance = (float) xLength / (float) numTicksX;
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float yTickDistance = (float) yLength / (float) numTicksY;
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int k;
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float j;
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float resX, resY;
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char label[10];
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resX = (maxX - minX) / xLength;
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resY = (maxY - minY) / yLength;
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glColor3f(0.0, 0.0, 0.0);
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/* drawing the coordinate system */
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glBegin(GL_LINES);
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// x axis
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glVertex2f(origin[0], origin[1]);
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glVertex2f(origin[0] + xLength, origin[1]);
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// y axis
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glVertex2f(origin[0], origin[1]);
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glVertex2f(origin[0], origin[1] + yLength);
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// arrow head at x axis
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glVertex2f(origin[0] + xLength, origin[1]);
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glVertex2f(origin[0] + xLength - 15, origin[1] - 10);
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glVertex2f(origin[0] + xLength, origin[1]);
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glVertex2f(origin[0] + xLength - 15, origin[1] + 10);
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// arrow head at y axis
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glVertex2f(origin[0], origin[1] + yLength);
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glVertex2f(origin[0] - 10, origin[1] + yLength - 15);
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glVertex2f(origin[0], origin[1] + yLength);
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glVertex2f(origin[0] + 10, origin[1] + yLength - 15);
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glEnd();
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// drawing ticks at x axis
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for (j = 0; j < xLength; j = j + xTickDistance) {
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glBegin(GL_LINES);
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glVertex2f(origin[0] + j, origin[1] - 5);
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glVertex2f(origin[0] + j, origin[1] + 5);
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glEnd();
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sprintf(label, "%5.2f", minX + (j*resX));
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glRasterPos2i((int) round(origin[0] + j - (8 * 5)), (int) round(origin[1] - 13 - 10));
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for (k = 0; k < 5; k++) {
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glutBitmapCharacter(GLUT_BITMAP_8_BY_13, label[k]);
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}
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}
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// drawing ticks at y axis
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for (j = 0; j < yLength; j = j + yTickDistance) {
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glBegin(GL_LINES);
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glVertex2f(origin[0] - 5, origin[1] + j);
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glVertex2f(origin[0] + 5, origin[1] + j);
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glEnd();
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sprintf(label, "%5.2f", minY + (j*resY));
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glRasterPos2i((int) round(origin[0] - (8 * 5) - 10), (int) round(origin[1] + j - 13 / 2));
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for (k = 0; k < 5; k++) {
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glutBitmapCharacter(GLUT_BITMAP_8_BY_13, label[k]);
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}
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}
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}
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void drawCircle(float origin[2], float center[2], float radius, GLint numPoints)
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{
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//////////////////////////////////////////////////////////////////////////////////////////////
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// - calculate numPoints points on the surface of the circle with given center and radius
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// hint: see circle equation in parametric form
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// - position points in the coordinate system starting at given origin
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// - draw the points by OpenGL commands
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//////////////////////////////////////////////////////////////////////////////////////////////
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}
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void display(void)
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{
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int n;
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int xTickDistance = 50;
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int yTickDistance = 50;
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int numPoints = 30;
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float radius[] = { 50, 100, 150 };
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float center[] = { 300, 200 };
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float origin[] = { 100, 100 };
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GLfloat c[] = { 0.0,0.0,0.0 };
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int xLength = 600;
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int yLength = 400;
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float size = 2;
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/* settings for the coordinate system */
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int numTicksX = 6;
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int numTicksY = 4;
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float minX = 0;
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float maxX = 600;
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float minY = 0;
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float maxY = 400;
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/* clearing the background color */
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glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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drawCoordinateSystem(origin, xLength, yLength, numTicksX, numTicksY, minX, maxX, minY, maxY);
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for (n = 0; n < 3; n++) {
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///////////////////////////////////////////////////////////////////////////////
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// - set the point size different for each loop iteration
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// - set the color different for each loop iteration
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//////////////////////////////////////////////////////////////////////////////
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drawCircle(origin, center, radius[n], numPoints);
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}
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glFlush();
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}
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int main(int argc, char** argv)
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{
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init(argc, argv);
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glutDisplayFunc(display);
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glutMainLoop();
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return 0;
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}
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@ -1,5 +0,0 @@
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cmake_minimum_required (VERSION 3.8)
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add_executable (hello_world helloWorld.c)
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target_include_directories(hello_world PRIVATE ${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS} )
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target_link_libraries(hello_world ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} )
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@ -1,8 +1,8 @@
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#include <GL/glut.h>
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#include <string.h>
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int width = 640;
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int height = 480;
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static int width = 640;
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static int height = 480;
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void init(int argc, char** argv)
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{
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@ -22,7 +22,7 @@ void init(int argc, char** argv)
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void display(void)
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{
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char* myText = "Hello World!";
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int j;
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unsigned long j;
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glClear(GL_COLOR_BUFFER_BIT);
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glColor3f(1.0, 0.0, 0.0);
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@ -36,7 +36,7 @@ void display(void)
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glColor3f(1.0, 1.0, 1.0);
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glRasterPos2i((width / 2) - (width / 4) + 10, (height / 2) - (height / 4) + 10);
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for (j = 0; j < strlen(myText); j++) {
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for (j = 0ul; j < strlen(myText); j++) {
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glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, myText[j]);
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}
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