Dear All,
I have a question about draw png image in widget.
I have a widget, I want to put a 50% transparent png file as it's background
picture, and the background picture can be changed to another 50% transparent
png file, the problem is when I change to another png file, still can see the
first png file in the below. If I only want to one png file any time, how to do?
My program is as below:
#include <stdio.h>
#include <string.h>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/fl_draw.H>
class MyWindow : public Fl_Window {
Fl_PNG_Image *left;
Fl_PNG_Image *right;
void GetFLTKVersion(char *s) {
sprintf(s, "FLTK %d.%d.%d", FL_MAJOR_VERSION, FL_MINOR_VERSION,
FL_PATCH_VERSION);
}
public:
void draw() {
Fl_Window::draw(); // Draw window widget first
fl_font(FL_HELVETICA, 40); // set font
fl_color(FL_BLACK); // set color
fl_draw("This is a test", 10, 150); // draw a text string
left->draw(0,0); // draw left alpha image over the
above
right->draw(0,0); // draw right alpha image over
the above
}
MyWindow(int W, int H) : Fl_Window(W,H) {
char s[80]; GetFLTKVersion(s); copy_label(s);
left = new Fl_PNG_Image("./1.png"); // assumes images in cwd
right = new Fl_PNG_Image("./2.png"); // assumes images in cwd
show();
}
};
int main() {
fl_register_images();
Fl::scheme("plastic");
MyWindow win(300,300);
win.show();
return(Fl::run());
}
in the above test, the 1.png and 2.png has same size, and both are 50%
transparent, but I can see 1.png and 2.png at the same time, I only want the
2.png overwrite the 1.png, how to do?
Best regards,
Leo
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