mmn_17.c

@@ -6,19 +6,11 @@
 #include <stdio.h>
 #include <math.h>
 #include "ui.h"
-// close enough
-#define PI 3.14
 
-
-// Camera rotation and stuff
-float camRadius = 10.0;
-vec3 camCenter = { 0.0, 0.0, 0.0 };
-vec3 camRot = { PI * 0.125, 0.0, 0.0 };
+int lastMouseButton = GLUT_LEFT_BUTTON;
+ui_slider* draggedSlider = NULL;
 
 // Ui stuff
-int lastMouseButton = GLUT_LEFT_BUTTON;
-int lastMouseX = 0, lastMouseY = 0;
-ui_slider* draggedSlider = NULL;
 void testButtonClick();
 ui_button buttons[] = {
     { 
@@ -32,7 +24,7 @@ ui_button buttons[] = {
 ui_slider sliders[] = {
     {
         /* pos */ { { 0.5, 0.7, 0.0 }, {-50.0, -5.0, 0.0 } },
-        /* size */ { 100.0, 10.0, 8.0 },
+        /* size */ { 100.0, 10.0, 10.0 },
         0.1
     }
 };
@@ -40,7 +32,6 @@ ui_slider sliders[] = {
 void testButtonClick() {
     printf("Clicked!\n");
     sliders[0].value = 0.5;
-    camCenter = vec3_new(0.0, 1.0, 0.0);
     glutPostRedisplay();
 }
 
@@ -74,27 +65,15 @@ void drawWorld(void) {
     // set perspective camera
     GLdouble wWidth = (GLdouble) glutGet(GLUT_WINDOW_WIDTH);
     GLdouble wHeight = (GLdouble) glutGet(GLUT_WINDOW_HEIGHT);
-    // Calculate current camera position from rotation
-    vec3 cp = vec3_new(0.0, 0.0, 0.0);
-    // rotate along the x axis(yz plane)
-    cp.z = cosf(camRot.x);
-    cp.y = sinf(camRot.x);
-    // rotate along the y axis(xy plane)
-    cp.x = cp.z * sinf(camRot.y);
-    cp.z *= cosf(camRot.y);
-    cp = vec3_mult(cp, camRadius);
-    cp = vec3_add(cp, camCenter);
-    
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
-    gluLookAt(cp.x, cp.y, cp.z, camCenter.x, camCenter.y, camCenter.z, 0.0, 1.0, 0.0);
+    gluLookAt(0.0, 10.0, 20.0, (0.5 - sliders[0].value) * 10.0, 0.0, 0.0, 0.0, 1.0, 0.0);
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     gluPerspective(90, wWidth / wHeight  , 1.0, 100.0);
     // Lights
     glEnable(GL_LIGHTING);
     glEnable(GL_LIGHT0);
-    // Directional light - aka light
     GLfloat light1[] = { 0.0, 1.0, 0.0, 0.0 };
     glLightfv(GL_LIGHT0, GL_POSITION, light1);
     // World
@@ -121,7 +100,6 @@ void display(void) {
 }
 
 void mouseEvent(int button, int state, int x, int y) {
-    lastMouseX = x; lastMouseY = y;
     if(state == 0) lastMouseButton = button;
     if(state == 0 && button == GLUT_LEFT_BUTTON) {
         for(ui_button* b = buttons; b < buttons + sizeof buttons / sizeof(ui_button); b += 1) {
@@ -156,44 +134,18 @@ void mouseMotionEvent(int x, int y) {
             }
         }
     }
-    // TODO: replace with wasd/space/ctrl movement instead
-    else if(lastMouseButton == GLUT_MIDDLE_BUTTON) {
-        // get xz plane rotation
-        float mx = cosf(camRot.y);
-        float mz = -sinf(camRot.y);
-        float m = (x - lastMouseX);
-        
-        camCenter.y += (y - lastMouseY) * 0.5;
-        camCenter.x -= m * mx;
-        camCenter.z -= m * mz;
-        printf("new cam center %f %f %f\n", camCenter.x, camCenter.y, camCenter.z);
-    }
-    else if(lastMouseButton == GLUT_RIGHT_BUTTON) {
-        // rotate the camera
-        camRot.y -= (x - lastMouseX) * PI * 0.01;
-        if(camRot.y > 2 * PI) camRot.y -= 2 * PI;
-        else if(camRot.y < 0.0) camRot.y += 2 * PI;
-        
-        camRot.x = fmin(PI * 0.5, fmax(-PI * 0.5, camRot.x + (y - lastMouseY) * 0.01 * PI));
-    }
-    lastMouseX = x; lastMouseY = y;
     glutPostRedisplay();
 }
 
 void mouseWheelEvent(int wheel, int dir, int x, int y) {
-    char slided = 0;
     for(ui_slider* s = sliders; s < sliders + sizeof sliders / sizeof(ui_slider); s += 1) {
         if(ui_slider_mouse_over(s, x, y)) {
             s->value += dir * 0.05;
             if(s->value < 0.0) s->value = 0.0;
             if(s->value > 1.0) s->value = 1.0;
             printf("Updated %p value to %f\n", s, s->value);
-            slided = 1;
         }
     }
-    if(!slided) {
-        camRadius *= 1.0 + (dir * 0.1);
-    }
     glutPostRedisplay();
 }
 
@@ -221,6 +173,11 @@ int main(int argc, char** argv) {
     glutMouseWheelFunc(mouseWheelEvent);
     glutMotionFunc(mouseMotionEvent);
     
+    /* set projection and camera */
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D(0.0, 800.0, 0.0, 500.0);
+    
     glutMainLoop();
     
     return 0;

ui.c

@@ -72,10 +72,11 @@ void ui_slider_draw(ui_slider* s) {
         glVertex3f(pos.x, pos.y + ext.y, pos.z);
         // Draw slider button thing
         glColor3f(1.0, 1.0, 1.0);
-        glVertex3f(slider.x - ext.z, slider.y - ext.z, 0.0);
-        glVertex3f(slider.x + ext.z, slider.y - ext.z, 0.0);
-        glVertex3f(slider.x + ext.z, slider.y + ext.z, 0.0);
-        glVertex3f(slider.x - ext.z, slider.y + ext.z, 0.0);
+        glVertex3f(slider.x - ext.z, slider.y - ext.y, 0.0);
+        glVertex3f(slider.x + ext.z, slider.y - ext.y, 0.0);
+        glVertex3f(slider.x + ext.z, slider.y + ext.y, 0.0);
+        glVertex3f(slider.x - ext.z, slider.y + ext.y, 0.0);
+        
     glEnd();
 }