Opencv simulated button and opencvbutton

Opencv simulated button and opencvbutton
Introduction

There is no special button control in opencv. Generally, you can use trackbar and set the status to 0 and 1 to simulate Control triggering. However, I always think this method is a bit of a second, so I tried to simulate the key value in opencv. At the same time in the implementation process, the use of information: http://www.csdn123.com/html/mycsdn20140110/84/8403a669ceed8e896d5c3ebc45b483b4.html, thank you very much.

Implementation Process
Code

void ButtonShow(void){int i; for(i=0; i< buttonNum; i++){if(i != 0){L_width = buttonAddr[i-1][2] + 30;}b_seat1=drawButton(img, buttonName[i],Point(L_width, L_height),0);buttonAddr[i] = (int *)malloc(4); buttonAddr[i][0] = b_seat1.x;buttonAddr[i][1] = b_seat1.y;buttonAddr[i][2] = b_seat1.width + b_seat1.x;buttonAddr[i][3] = b_seat1.height+ b_seat1.y;}} void on_mouse( int event, int x, int y, int flags, void* ustc)  {int buttonNow = -3;if(event == CV_EVENT_LBUTTONDOWN){tmpAddr[0] = x;tmpAddr[1] = y;tmpAddr[2] = 0;tmpAddr[3] = 0;}else if(event == CV_EVENT_LBUTTONUP){tmpAddr[2] = x;tmpAddr[3] = y;buttonNow = choiceButton(tmpAddr, buttonAddr, buttonNum);on_button(buttonNow);}}   int main(int argc,char **argv){img=imread(back_name,1); ButtonShow();imshow(back_show, img);cvSetMouseCallback(back_show, on_mouse, NULL);waitKey();}

Subject framework

First, load an image as the background image, then use ButtonShow to draw the button on the background image, and save the coordinates of each button in the buttonAddr array, then, the background image after the button is displayed. Then, the background image is added with a mouse response and waiting for the user to operate.

        img=imread(back_name,1);        ButtonShow();imshow(back_show, img);cvSetMouseCallback(back_show, on_mouse, NULL);waitKey();

Mouse response

Save the coordinates left-click and raised by the user in tmpAddr, and then use the choiceButton and on_button functions to select and respond to the control.

void on_mouse( int event, int x, int y, int flags, void* ustc){int buttonNow = -3;if(event == CV_EVENT_LBUTTONDOWN){tmpAddr[0] = x;tmpAddr[1] = y;tmpAddr[2] = 0;tmpAddr[3] = 0;}else if(event == CV_EVENT_LBUTTONUP){tmpAddr[2] = x;tmpAddr[3] = y;buttonNow = choiceButton(tmpAddr, buttonAddr, buttonNum);on_button(buttonNow);}}

Control Selection

int choiceButton(int* tmpAddr, int** buttonAddr, int size){int i, tmp; tmp = abs(tmpAddr[0] - tmpAddr[2]) + abs(tmpAddr[1] - tmpAddr[3]);if(tmp > 20){return -2;}for(i=0; i< size; i++){if((buttonAddr[i][0] < tmpAddr[0]) && (buttonAddr[i][2] > tmpAddr[0])){if((buttonAddr[i][1] < tmpAddr[1]) && (buttonAddr[i][3] > tmpAddr[3])){return i;}}}return -1;}

Call the choiceButton function when the left mouse button is lifted. TmpAddr: coordinates when the left mouse button is pressed and when the left mouse button is lifted. ButtonAddr: the number of controls and their coordinate information. Size: number of controls. In choiceButton, 1. judge whether the coordinates of the mouse are in the same position. If not, return-2 directly. 2. Determine whether the coordinates pressed by the left mouse button are in the control range or not. If yes, the control number is directly returned. 3. If the left mouse button is not in the range of any control,-1 is returned.

Control response

void on_button(int buttonNow){char str[20];sprintf(str,"%d", buttonNow);Mat img = cv::Mat(300, 300, CV_8UC3, 1);imshow(str, img);}

Select a parameter based on the preceding control. The parameter is used as the name of the display window of the blank image and displayed.

Effect demonstration

The corresponding effect is shown as follows:

Press the control: cancel. The window 0 is displayed. Press Control: add. Window 1 is displayed.