在windowResized（）中调用SetWindowShape（）在Ubuntu上冻结应用程序

Question

我试图使OF窗口按比例调整大小，保持窗口的width和height之间的比例相同。例如，如果您创建了一个尺寸为400x300的窗口，并且如果将宽度拉伸至800，那么即使您只横向拉伸窗口，高度也会自动拉伸至600。

无论如何，为了实现此功能，我需要在windowResized()听众内部使用ofSetWindowShape()。

我可以在MacOS X上快速创建原型并且工作得非常好。

下面的代码：

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); 
} 

但是，如果我运行在Ubuntu相同的代码，应用程序冻结只要我调整窗口的大小。看起来ofSetWindowShape()调用windowResized()侦听器，因此它进入无限循环。

（windowResized - > ofSetWindowShape - > windowResized - > ofSetWindowShape ....）

如何更改代码，以便它也可以在Ubuntu上运行没有问题？ 任何意见或指导将不胜感激！

P.S：我也很感谢Linux用户是否可以确认应用程序冻结。

Answer 1

你尝试：

ofSetupOpenGL(widthScaled, heightScaled, OF_WINDOW); 

显然ofSetWindowShape（）只能应用在被称为::设置（）... see OF tutorials here