What is the simplest way of rendering an application-generated
image using DLangUI?
I'm trying to render the outputs of some noise-generating
functions, along with some controls to alter the parameters of
that function. I didn't see an ImageWidget anywhere, so I tried
making my own that takes in a DrawBuf. The code is below.
When the `buf.drawRescaled` line in the `onDraw` method is
commented out, the `buf.drawLine` will render a line over where
the widget would be located. But when the `drawRescaled` line is
uncommented, the entire window becomes white; not even the line
drawn afterwards is visible.
What am I doing wrong? Alternatively, is there a simpler way that
I'm not thinking of or don't see?
import std.stdio;
import dlangui;
mixin APP_ENTRY_POINT;
enum W = 512;
enum H = 512;
final class CanvasWidget : Widget {
private DrawBuf canvas;
this(DrawBuf canvas) {
this.canvas = canvas;
}
override void onDraw(DrawBuf buf) {
if (visibility != Visibility.Visible)
return;
Rect rc = _pos;
//buf.drawRescaled(rc, canvas, Rect(0,0,canvas.width,
canvas.height));
buf.drawLine(Point(rc.left, rc.top), Point(rc.right,
rc.bottom), 0xff0000);
_needDraw = false;
}
}
void draw(ColorDrawBuf img) {
for(int y=0; y<img.height; y++) {
auto scanline = img.scanLine(y);
for(uint x=0; x<img.width; x++) {
scanline[x] = 0xFF0000;
}
}
}
//void main() {
extern(C) int UIAppMain(string[] args) {
Platform.instance.resourceDirs = [];
Platform.instance.uiLanguage = "en";
Platform.instance.uiTheme = "theme_default";
Window window = Platform.instance.createWindow("Window", null);
VerticalLayout baseLayout = new VerticalLayout();
baseLayout.layoutWidth = FILL_PARENT;
baseLayout.layoutHeight = FILL_PARENT;
window.mainWidget = baseLayout;
auto img = new ColorDrawBuf(W,H);
draw(img);
Widget canvas = new CanvasWidget(img);
canvas.layoutWidth = W;
canvas.layoutHeight = H;
baseLayout.addChild(canvas);
baseLayout.addChild((new Button())
.text("Test"d)
.textColor(0xff0000)
);
window.show();
return Platform.instance.enterMessageLoop();
}
