java - How to set the gradient of a shape when the JFrame is constantly being repainted? -

-

i'm trying oval change gradient's colours every time reaches size of 50 or 100: 

    class mydrawpanel extends jpanel {     public void paintcomponent(graphics g) {          graphics2d g2d = (graphics2d) g;          g2d.setcolor(color.white);         g2d.fillrect(0, 0, 300, 300);          if(dmt == 100 || dmt == 50) {             int red = (int) (math.random() * 256);             int blue = (int) (math.random() * 256);             int green = (int) (math.random() * 256);             color startcolour = new color(red, green, blue);              red = (int) (math.random() * 256);             blue = (int) (math.random() * 256);             green = (int) (math.random() * 256);             color endcolour = new color(red, green, blue);              gradientpaint gradient = new gradientpaint(300, 100, startcolour, 150, 150, endcolour);             g2d.setpaint(gradient);         }         g2d.filloval((size-dmt)/2, (size-dmt)/2 - dmt/2, dmt, dmt);     } }

(dmt diameter, size size of window comes up)

i set 2 random colours gradients want use circle, want change when circle reaches either size 100 or 50 (it growing , shrinking these sizes), since repaint white every time runs, can never see except when size 50 or 100. how make colour, until has change?

how make colour, until has change?

somewhere must have method changes "dmt" variable. method should responsible changing properties of class. in addition dmt variable should have startcolor , endcolor variables.

then code should like:

public void setdmt(...); {     if (dmt == 50 || dmt == 100)     {         startcolor = ???         endcolor = ???     } }

when create class need set startcolor/endcolor default value.

then in paintcomponent() method use these 2 varaibles:

    graphics2d g2d = (graphics2d) g;      g2d.setcolor(color.white);     g2d.fillrect(0, 0, 300, 300);      gradientpaint gradient = new gradientpaint(300, 100, startcolour, 150, 150, endcolour);     g2d.setpaint(gradient);      g2d.filloval((size-dmt)/2, (size-dmt)/2 - dmt/2, dmt, dmt);

Comments

Post a Comment

Popular posts from this blog

java - Custom OutputStreamAppender not run: LOGBACK: No context given for <MYAPPENDER> -

-
i wish write custom appender on basis of outputstreamappender . wrote following class package tests; import java.io.ioexception; import java.io.outputstream; import ch.qos.logback.core.outputstreamappender; public class myappender<e> extends outputstreamappender<e> { public myappender() { system.out.println("myappender created"); setoutputstream(new outputstream() { @override public void write(int b) throws ioexception { throw new unsupportedoperationexception(); } }); } } then wrote following runner: package tests; import org.slf4j.loggerfactory; import ch.qos.logback.classic.logger; public class runner { private static final logger log = (logger) loggerfactory.getlogger(runner.class); public static void main(string[] args) { //log.addappender(new myappender<iloggingevent>()); log.info("hello world"); } } finall...
Read more

java - UML - How would you draw a try catch in a sequence diagram? -

-
Image
is there standard way of drawing try catch sequence diagrams? i've made attempt based on this feel end result doesn't feel right. code diagram based around: public static void save () { try { filehandle filehandle = gdx.files.external(file); filehandle.writestring(boolean.tostring(constantshandler.soundenabled)+"\n", false); (int = 0; < 5; i++) { filehandle.writestring(integer.tostring(constantshandler.highscores[i])+"\n", true); } } catch (throwable e) { } } my attempt note: know still need add loop. that's ok. fragments meant show conditional control flow in sequence diagram. superstructures puts limitations on use of fragments (see pp. 467 of ss2.1.1). should use critical region try part above. , option catch . however, keep telling can take quite freedom in using uml. it's language , such changes in life time. long reader ge...
Read more

c++ - No viable overloaded operator for references a map -

-
i trying use map can make tag names reference number. when try , use it, in code error (6 in total every time reference map): src/main.cpp:25:45: error: no viable overloaded operator[] type 'std::map<std::string, std::string>' const char* idcs = node.child_value(tagmap[3]); this code: #include "pugi/pugixml.hpp" #include <iostream> #include <string> #include <map> int main() { pugi::xml_document doca, docb; std::map<std::string, pugi::xml_node> mapa, mapb; std::map<std::string, std::string> tagmap {{"1", "data"}, {"2", "entry"}, {"3", "id"}, {"4", "content"}}; if (!doca.load_file("a.xml") || !docb.load_file("b.xml")) { std::cout << "can't find input files"; return 1; } (auto& node: doca.child(tagmap[1]).children(tagmap[2])) { co...
Read more