I'm trying to make the OF window get resized proportionally maintaining the same ratio between width and height of the window.
For example, if you created a window with 400x300 dimensions and if you stretch the width to 800, then the height will automatically be stretched to 600 even though you only stretched the window horizontally.
Anyways, in order to implement this feature, I needed to use ofSetWindowShape() inside windowResized() listener.
I could quickly prototype this on MacOS X and it worked very well.
Here's the code:
ofApp.h
enum ScaleDir { //window scaling directions
SCALE_DIR_HORIZONTAL,
SCALE_DIR_VERTICAL,
};
ScaleDir scaleDir;
int windowWidth, windowHeight; //original window dimensions
float widthScaled, heightScaled; //scaled window dimensions
float windowScale; //scale amount (1.0 = original)
bool bScaleDirFixed; //is direction fixed?
ofApp.cpp
//--------------------------------------------------------------
void ofApp::setup(){
windowWidth = ofGetWidth();
windowHeight = ofGetHeight();
windowScale = 1.0f;
widthScaled = windowWidth * windowScale;
heightScaled = windowHeight * windowScale;
}
//--------------------------------------------------------------
void ofApp::update(){
if (bScaleDirFixed) {
bScaleDirFixed = false;
}
}
//--------------------------------------------------------------
void ofApp::draw(){
ofSetColor(255, 0, 0);
ofSetCircleResolution(50);
ofDrawEllipse(widthScaled/2, heightScaled/2, widthScaled, heightScaled); //the ellipse will be scaled as the window gets resized.
}
//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){
if (!bScaleDirFixed) {
int gapW = abs(widthScaled - w);
int gapH = abs(heightScaled - h);
if (gapW > gapH)
scaleDir = SCALE_DIR_HORIZONTAL;
else
scaleDir = SCALE_DIR_VERTICAL;
bScaleDirFixed = true;
}
float ratio;
if (scaleDir == SCALE_DIR_HORIZONTAL) {
ratio = static_cast<float>(windowHeight) / static_cast<float>(windowWidth);
h = w * ratio;
windowScale = static_cast<float>(w) / static_cast<float>(windowWidth);
}
else if (scaleDir == SCALE_DIR_VERTICAL) {
ratio = static_cast<float>(windowWidth) / static_cast<float>(windowHeight);
w = h * ratio;
windowScale = static_cast<float>(h) / static_cast<float>(windowHeight);
}
widthScaled = windowWidth * windowScale;
heightScaled = windowHeight * windowScale;
ofSetWindowShape(widthScaled, heightScaled);
}
However, if I run the same code on Ubuntu, the app freezes as soon as I resize the window. It seems ofSetWindowShape() calls windowResized() listener and therefore it goes into an infinite loop.
(windowResized -> ofSetWindowShape -> windowResized ->
ofSetWindowShape....)
How can I change the code so it can also work on Ubuntu without the problem?
Any advice or guidance would be greatly appreciated!
P.S: I would also appreciate if Linux users can confirm the app freezing.
Did you try:
ofSetupOpenGL(widthScaled, heightScaled, OF_WINDOW);
Apparently ofSetWindowShape() should only be called during App::Setup() ...
see OF tutorials here
Related
I wrote a simple FLTK program to draw a circle when clicking on the "Draw Circle" button and to draw a line when clicking on the "Draw Line" button. I supposed to have only one graph. But I got two graphs in the panel. I want only one showing and the other disappearing. The following is the code:
#include <FL/Fl.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Double_Window.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Box.H>
using namespace std;
int flag = 0;
class Drawing : public Fl_Box {
void draw() {
fl_color(255, 0, 0);
int x, y, x1, y1;
if (flag == 1) {
double radius = 100;
x = (int)(w() / 2);
y = (int)(h() / 2);
fl_circle(x, y, radius);
}
else if (flag == -1) {
x = (int)(w() / 4);
y = (int)(h() / 4);
x1 = (int)(w() *3/ 4);
y1 = (int)(h() *3/ 4);
fl_line(x, y, x1, y1);
}
}
public:
Drawing(int X, int Y, int W, int H) : Fl_Box(X, Y, W, H) {}
};
Drawing* d;
void circle_cb(Fl_Widget*, void*) {
flag = 1;
fl_overlay_clear();
d->redraw();
} // end sumbit_cb
void line_cb(Fl_Widget*, void*) {
flag = -1;
fl_overlay_clear();
d->redraw();
} // end clear_cb
int main(int argc, char** argv) {
Fl_Window* window = new Fl_Window(600, 550); // create a window, originally(400,400)
Drawing dr(0, 0, 600, 600);
d = &dr;
Fl_Button *b, *c;
b = new Fl_Button(150, 80, 100, 25, "&Draw Circle");
b->callback(circle_cb);
c = new Fl_Button(350, 80, 100, 25, "&Draw Line");
c->callback(line_cb);
window->end(); //show the window
window->show(argc, argv);
return Fl::run();
}
I have used fl_overlay_clear() to clear graph. However it is not working. Any help will be appreciated.
There are several issues that need to be fixed in your program, but first of all using the draw() method as you did is basically correct. However, using fl_overlay_clear(); is useless, you can remove it.
My solution: your widget doesn't have a solid background (boxtype), i.e. your draw method draws over the background over and over again w/o clearing it. There are several ways to solve this, but if you want to learn what happens, try this first: add window->resizable(window); before window->show(argc, argv);, run the program again and resize the window. You'll notice that the previous drawing disappears and only one drawing stays. That's because the background is cleared when you resize the widget.
Next step: add a solid boxtype:
d = &dr;
d->box(FL_DOWN_BOX);
and add Fl_Box::draw(); right at the beginning of your draw() method.
If you do that you may notice that your button(s) disappear when you click one of them - because your buttons are inside the area of your Drawing. The last thing(s) I fixed was to correct the coordinates of buttons and to enlarge the window (it was too small anyway to cover the entire Drawing). Here's my complete result:
#include <FL/Fl.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Double_Window.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Box.H>
using namespace std;
int flag = 0;
class Drawing : public Fl_Box {
void draw() {
Fl_Box::draw();
fl_color(255, 0, 0);
int x, y, x1, y1;
if (flag == 1) {
double radius = 100;
x = (int)(w() / 2);
y = (int)(h() / 2);
fl_circle(x, y, radius);
} else if (flag == -1) {
x = (int)(w() / 4);
y = (int)(h() / 4);
x1 = (int)(w() * 3 / 4);
y1 = (int)(h() * 3 / 4);
fl_line(x, y, x1, y1);
}
}
public:
Drawing(int X, int Y, int W, int H)
: Fl_Box(X, Y, W, H) {}
};
Drawing *d;
void circle_cb(Fl_Widget *, void *) {
flag = 1;
// fl_overlay_clear(); // not useful
d->redraw();
} // end sumbit_cb
void line_cb(Fl_Widget *, void *) {
flag = -1;
// fl_overlay_clear(); // not useful
d->redraw();
} // end clear_cb
int main(int argc, char **argv) {
Fl_Window *window = new Fl_Window(600, 660); // create a window, originally(400,400)
Drawing dr(0, 60, 600, 600); // FIXED
d = &dr;
d->box(FL_DOWN_BOX); // ADDED
Fl_Button *b, *c;
b = new Fl_Button(150, 20, 100, 25, "&Draw Circle"); // FIXED
b->callback(circle_cb);
c = new Fl_Button(350, 20, 100, 25, "&Draw Line"); // FIXED
c->callback(line_cb);
window->end(); // show the window
window->resizable(window); // ADDED
window->show(argc, argv);
return Fl::run();
}
I believe this does what you want.
PS: the official FLTK support forum can be found on our website https://www.fltk.org/ and the direct link to the user forum (Google Groups) is https://groups.google.com/g/fltkgeneral
Just a quick addition to what Albrecht put so perfectly: FLTK drawing coordinates are relative to the window, not relative to the widget. You probably want to offset your drawing by the x() and y() coordinates of your widget.
In your handle() methods line_cb() , circle_cb() should call window()->make_current() and then fl_overlay_rect() after FL_DRAG events, and should call fl_overlay_clear() after a FL_RELEASE event. Refer for more details
int width = 800;
int height = 600;
int interval = 1000 / 60;
int score_player1 = 0;
int score_player2 = 0;
int racket_width = 10;
int racket_height = 80;
int racket_speed = 8;
int racket_left_x = 10;
int racket_left_y = 50;
int racket_right_x = width - racket_width - 10;
int racket_right_y = 50;
Full code (without the class for the ball): http://pastebin.com/TA9NkV5c
The margin from the right racket to right side of the window is smaller than the left side. The variables for those are right calculated, but still, it is not equally.
http://i.imgur.com/2PA0pGz.png Link to the image
You've set the window to a width of 800 pixels, but everything else is positioned relative to the client region, which is narrower than the window width by the thickness of the border.
Use AdjustWindowRect to compute the size you have to make the window in order get the client area to be the desired size.
// Initialize a RECT with the size you want the client area to be.
RECT rc = { 0, 0, width, height };
// Now adjust the rectangle to the size the window would need to be.
AdjustWindowRect(&rc, my_style_flags, FALSE);
// Now create the window using the sizes in rc. Make sure you use
// consistent style flags or the adjustment may not be correct.
const int window_width = rc.right - rc.left;
const int window_height = rc.bottom - rc.top;
my_hwnd = CreateWindow(..., my_style_flags, x, y, window_width, window_height, ...);
I have a QMainWindow and wish to remember its size and position on the screen.
This I can do with saveGeometry(), to save the settings to a .ini file and restoreGeometry() - to restore the window.
However, what will be the behaviour of the Window on a multiscreen setup?
Is it possible for the Window to be launched on the correct calling window, and with its size and position on that window remembered?
In my current implementation, I have taken care of the launch of the application where the mouse pointer currently is, but the window is always full screen, unless someone sets the position manually in the ini file.
int posX = cSfcConfig::getProperties(MAIN_WINDOW, POS_X).toInt();
int posY = cSfcConfig::getProperties(MAIN_WINDOW, POS_Y).toInt();
QByteArray locationArray = cSfcConfig::getLocationSetting();
if ( posX > 0 || posY > 0)
{
QRect rect = QDesktopWidget().availableGeometry();
QDesktopWidget *m=new QDesktopWidget();
QPoint p= QCursor::pos();
int r= m->screenNumber(p);
QRect d=m->screenGeometry(r);
//QPoint l = d.();
int width = rect.width() - (posX * 2);
int height = rect.height() - posY;
//mainWindow.restoreGeometry(locationArray);
//mainWindow.restoreState(cSfcConfig::GetStateSetting());
mainWindow.setGeometry(posX, posY, width, height);
mainWindow.show();
mainWindow.move(l);
}
else
{
mainWindow.showMaximized();
}
I am trying to create a SDL window which keeps its aspect ratio when resize event happens. If user widens the window, the height is increased and vice versa. I catch the SDL_WINDOWEVENT_RESIZED event, calculate new width or height which maintains the aspect ratio and then call SDL_SetWindowSize() with calculated values.
The problem is that calling the SDL_SetWindowSize() function inside the event polling loop does nothing on the screen. SDL does update the window size variables (calling SDL_GetWindowSize() in my main loop returns the updated window dimensions). However, the actual window is not updated.
The only way I can get this to work is to call constantly SDL_SetWindowSize() in the main loop, but I think that is the wrong way of doing things. The code below illustrates my problem. Is there a better and cleaner way to get this to work?
I am using SDL 2.0.3 and 64-bit Ubuntu Linux with GNOME desktop.
#include <SDL2/SDL.h>
static const float ASPECT_RATIO = 16.f/9.f;
SDL_Window* window;
SDL_Renderer* renderer;
uint32_t windowID;
SDL_Rect screen;
bool done = false;
bool resizeDone = false;
void handle_events()
{
SDL_Event e;
while (SDL_PollEvent(&e)) {
switch (e.type) {
case SDL_WINDOWEVENT:
if(e.window.windowID == windowID) {
switch(e.window.event) {
case SDL_WINDOWEVENT_RESIZED: {
int width = e.window.data1;
int height = e.window.data2;
float aspectRatio = (float)width/(float)height;
if(aspectRatio != ASPECT_RATIO) {
if(aspectRatio > ASPECT_RATIO) {
height = (1.f / ASPECT_RATIO) * width;
}
else {
width = ASPECT_RATIO * height;
}
printf("Setting window size to %d, %d, aspect ratio: %f\n",
width, height, (float)width/(float)height);
}
screen.w = width;
screen.h = height;
SDL_SetWindowSize(window, width, height); // <-- does not work
resizeDone = true;
break;
}
}
}
break;
case SDL_QUIT:
done = true;
break;
default:
break;
}
}
}
void run() {
while(!done) {
//SDL_SetWindowSize(window, screen.w, screen.h); // <-- works
handle_events();
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
if(resizeDone) {
int w, h;
SDL_GetWindowSize(window, &w, &h);
printf("SDL_GetWindowSize: %d, %d\n", w, h);
resizeDone = false;
}
}
}
int main(int, char**) {
SDL_Init(SDL_INIT_VIDEO);
uint32_t window_flags = SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_RESIZABLE;
window = SDL_CreateWindow("Test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
windowID = SDL_GetWindowID(window);
renderer = SDL_CreateRenderer(window, -1, 0);
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
run();
SDL_Quit();
return 0;
}
Some window managers seems to ignore resize requests made while WM itself resizes window (e.g. while mouse button held). On contrary, SDL_GetWindowSize returns cached values, which in that specific case sometimes happens to be wrong.
I see no platform-independent way to achieve that, other than constantly calling SDL_SetWindowSize on each frame, just in case. It could be achieved using platform-specific APIs, though (like SDL_GetWindowSysWMInfo and then using Xlib).
On macOS, I have solved it like this:
cocoa.m:
#import <Cocoa/Cocoa.h>
void SetWindowRatio(void *window) {
NSWindow *win = (__bridge NSWindow*) window;
win.aspectRatio = NSMakeSize( 1280, 720 );
}
main.cpp:
#include <SDL.h>
#include <SDL_syswm.h>
extern "C" void SetWindowRatio(void *window);
// and later..
SDL_SysWMinfo wmInfo;
SDL_VERSION(&wmInfo.version);
SDL_GetWindowWMInfo(sdl.window, &wmInfo);
SetWindowRatio(wmInfo.info.cocoa.window);
Perhaps something similar could be done on Linux, only access different part of wmInfo.info. and call the native function?
Creating a window with GLFW3 is done using glfwCreateWindow:
GLFWwindow* glfwCreateWindow ( int width,
int height,
const char *title,
GLFWmonitor *monitor,
GLFWwindow *share
)
If the monitor parameter is not NULL, the window is created in full screen mode on the given monitor. One can receive the primary monitor by calling glfwGetPrimaryMonitor, or chose one of the results of glfwGetMonitors. But how can I create a full screen window on the current monitor, i.e. the monitor the window is currently running in windowed mode? There seems to be no way to receive the currently used monitor. There is glfwGetWindowMonitor, but it only returns the monitor in full screen mode, NULL in windowed mode.
You can find the current monitor with glfwGetWindowPos/glfwGetWindowSize.
This function returns the monitor that contains the greater window area.
static int mini(int x, int y)
{
return x < y ? x : y;
}
static int maxi(int x, int y)
{
return x > y ? x : y;
}
GLFWmonitor* get_current_monitor(GLFWwindow *window)
{
int nmonitors, i;
int wx, wy, ww, wh;
int mx, my, mw, mh;
int overlap, bestoverlap;
GLFWmonitor *bestmonitor;
GLFWmonitor **monitors;
const GLFWvidmode *mode;
bestoverlap = 0;
bestmonitor = NULL;
glfwGetWindowPos(window, &wx, &wy);
glfwGetWindowSize(window, &ww, &wh);
monitors = glfwGetMonitors(&nmonitors);
for (i = 0; i < nmonitors; i++) {
mode = glfwGetVideoMode(monitors[i]);
glfwGetMonitorPos(monitors[i], &mx, &my);
mw = mode->width;
mh = mode->height;
overlap =
maxi(0, mini(wx + ww, mx + mw) - maxi(wx, mx)) *
maxi(0, mini(wy + wh, my + mh) - maxi(wy, my));
if (bestoverlap < overlap) {
bestoverlap = overlap;
bestmonitor = monitors[i];
}
}
return bestmonitor;
}
After discussion on IRC it seems that it is not possible to retrieve the currently active monitor (as in the monitor the window is currently drawn on) with GLFW. Therefore it is not possible to create a full screen window on the current monitor.
EDIT: Even though there is no GLFW functionality to directly achieve this, the answer of Shmo provides an elegant solution.
Here is Shmo's answer, ported over to LWJGL:
/** Determines the current monitor that the specified window is being displayed on.
* If the monitor could not be determined, the primary monitor will be returned.
*
* #param window The window to query
* #return The current monitor on which the window is being displayed, or the primary monitor if one could not be determined
* #author Shmo<br>
* Ported to LWJGL by Brian_Entei */
#NativeType("GLFWmonitor *")
public static final long glfwGetCurrentMonitor(long window) {
int[] wx = {0}, wy = {0}, ww = {0}, wh = {0};
int[] mx = {0}, my = {0}, mw = {0}, mh = {0};
int overlap, bestoverlap;
long bestmonitor;
PointerBuffer monitors;
GLFWVidMode mode;
bestoverlap = 0;
bestmonitor = glfwGetPrimaryMonitor();// (You could set this back to NULL, but I'd rather be guaranteed to get a valid monitor);
glfwGetWindowPos(window, wx, wy);
glfwGetWindowSize(window, ww, wh);
monitors = glfwGetMonitors();
while(monitors.hasRemaining()) {
long monitor = monitors.get();
mode = glfwGetVideoMode(monitor);
glfwGetMonitorPos(monitor, mx, my);
mw[0] = mode.width();
mh[0] = mode.height();
overlap =
Math.max(0, Math.min(wx[0] + ww[0], mx[0] + mw[0]) - Math.max(wx[0], mx[0])) *
Math.max(0, Math.min(wy[0] + wh[0], my[0] + mh[0]) - Math.max(wy[0], my[0]));
if (bestoverlap < overlap) {
bestoverlap = overlap;
bestmonitor = monitor;
}
}
return bestmonitor;
}