Widget's icon can't change a color in real time

[Dreikblack]

#include "UltraEngine.h"

using namespace UltraEngine;

shared_ptr<Window> window;
shared_ptr<Framebuffer> framebuffer;
shared_ptr<World> menuWold;
shared_ptr<Interface> ui;
shared_ptr<Camera> uiCamera;

shared_ptr<Widget> panel;
shared_ptr<Icon> icon;

bool isFirst = true;

void initGui() {
    auto default_font = LoadFont("Fonts\\arial.ttf");
    ui = CreateInterface(menuWold, default_font, framebuffer->GetSize());
    ui->SetRenderLayers(2);
    ui->root->SetColor(0.0f, 0.0f, 0.0f, 0.0f);
    uiCamera = CreateCamera(menuWold, PROJECTION_ORTHOGRAPHIC);
    uiCamera->SetPosition((float)framebuffer->GetSize().x * 0.5f, (float)framebuffer->GetSize().y * 0.5f, 0);
    uiCamera->SetRenderLayers(2);
    uiCamera->SetClearMode(CLEAR_DEPTH);

    panel = CreatePanel(10, 50, 64, 64, ui->root, PANEL_DEFAULT);
    icon = LoadIcon("https://raw.githubusercontent.com/UltraEngine/Documentation/master/Assets/Icons/help.svg");
    icon->SetColor(0.5, 0.5, 1.0);
    panel->SetIcon(icon);
    panel->Redraw();
}


int main(int argc, const char* argv[]) {
    auto displays = GetDisplays();
    window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_DEFAULT);
    menuWold = CreateWorld();
    menuWold->RecordStats();
    framebuffer = CreateFramebuffer(window);
    auto light = CreateBoxLight(menuWold);
    auto camera = CreateCamera(menuWold);
    camera->SetClearColor(0.125);

    initGui();

    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false) {
        if (window->KeyHit(KEY_SPACE)) {           
            isFirst = !isFirst;
            if (isFirst) {
                panel->icon->SetColor(0.5, 0.5, 0.5);
                panel->SetIcon(panel->icon);
                panel->Redraw();
            } else {
                panel->icon->SetColor(1.0, 1.0, 0.5);
                panel->SetIcon(panel->icon);
                panel->Redraw();
            }
        }
        menuWold->Update();
        menuWold->Render(framebuffer);
    }
    return 0;
}

 

[Dreikblack]

Found work around with panel->SetIcon(nullptr);

[Josh]

The way setIcon works is it rasterizes a pixmap with the required scale and applies that to the widget. Setting an icon color will clear all cached pixmaps the icon stores, but the icon does not store a list of widget it has been applied to. I could add this using weak pointers, but I am leaning towards leaving the current behavior alone, since it is a pretty rare use case.

[Dreikblack]

Can't say it's rare since color often shows current state of buttons or status of icons in games

[Josh]

I considered it but there are two things that made me decide against it.

• An icon may be in use across many widgets, so using it to indicate state isn't a great idea.
• Rasterization is of an icon into a pixmap (which must be done to make it visible) is a relatively slow step and should be avoided in real-time.

If anything, it would probably be better to have the widget foreground color affect the widget pixmap.

[Josh]

I am going to mark this as solved and icons, for the time being, will be considered a vector image from which pixmaps are rasterized. I need to focus on the more basic functionality and make sure that works before adding more complexity.