/* * Smart GWT (GWT for SmartClient) * Copyright 2008 and beyond, Isomorphic Software, Inc. * * Smart GWT is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License version 3 * as published by the Free Software Foundation. Smart GWT is also * available under typical commercial license terms - see * http://smartclient.com/license * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ import com.smartgwt.client.types.Cursor; import com.smartgwt.client.types.Overflow; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.drawing.ColorStop; import com.smartgwt.client.widgets.drawing.DrawCurve; import com.smartgwt.client.widgets.drawing.DrawOval; import com.smartgwt.client.widgets.drawing.DrawPane; import com.smartgwt.client.widgets.drawing.DrawRect; import com.smartgwt.client.widgets.drawing.DrawTriangle; import com.smartgwt.client.widgets.drawing.LinearGradient; import com.smartgwt.client.widgets.drawing.Point; import com.smartgwt.client.widgets.events.DrawEvent; import com.smartgwt.client.widgets.events.DrawHandler; import com.smartgwt.client.widgets.form.DynamicForm; import com.smartgwt.client.widgets.form.events.ItemChangedEvent; import com.smartgwt.client.widgets.form.events.ItemChangedHandler; import com.smartgwt.client.widgets.form.fields.ColorPickerItem; import com.smartgwt.client.widgets.form.fields.SliderItem; import com.smartgwt.client.widgets.layout.HLayout; import com.smartgwt.client.widgets.layout.VStack; import com.google.gwt.core.client.EntryPoint; public class LinearGradientSample implements EntryPoint { private DrawPane drawPane; private DynamicForm linearGradientDynamicForm, linearGradientSliderDynamicForm; public void onModuleLoad() { /* ------------------------------------------- */ drawPane = new DrawPane(); drawPane.setTop(950); drawPane.setHeight(400); drawPane.setLeft(25); drawPane.setWidth(400); drawPane.setEdgeSize(4); drawPane.setBackgroundColor("papayawhip"); drawPane.setOverflow(Overflow.HIDDEN); drawPane.setCursor(Cursor.AUTO); drawPane.addDrawHandler(new DrawHandler() { @Override public void onDraw(DrawEvent event) { DrawPane drawPane = (DrawPane) event.getSource(); linearGradientShapesDraw(drawPane); } }); ItemChangedHandler linearGradientItemChangedHandler = new ItemChangedHandler() { @Override public void onItemChanged(ItemChangedEvent event) { linearGradientShapesDraw(drawPane); } }; ColorPickerItem startColorColorPicker = new ColorPickerItem("startColor","Start Color"); ColorPickerItem firstStopColorPicker = new ColorPickerItem("firstStop","First Stop Color"); ColorPickerItem secondStopColorPicker = new ColorPickerItem("secondStop","Second Stop Color"); ColorPickerItem endColorColorPicker = new ColorPickerItem("endColor","End Color"); startColorColorPicker.setDefaultValue("#ff0000"); firstStopColorPicker.setDefaultValue("#ffff00"); secondStopColorPicker.setDefaultValue("#00ff00"); endColorColorPicker.setDefaultValue("#0000ff"); linearGradientDynamicForm = new DynamicForm(); linearGradientDynamicForm.setID("linearGradientDynamicForm"); linearGradientDynamicForm.setWidth(250); linearGradientDynamicForm.addItemChangedHandler(linearGradientItemChangedHandler); linearGradientDynamicForm.setFields(startColorColorPicker, firstStopColorPicker, secondStopColorPicker, endColorColorPicker); SliderItem x1Slider = new SliderItem("x1"); x1Slider.setMinValue(1); x1Slider.setMaxValue(100); x1Slider.setHeight(20); x1Slider.setDefaultValue(20); SliderItem y1Slider = new SliderItem("y1"); y1Slider.setMinValue(1); y1Slider.setMaxValue(100); y1Slider.setHeight(20); y1Slider.setDefaultValue(20); SliderItem x2Slider = new SliderItem("x2"); x2Slider.setMinValue(1); x2Slider.setMaxValue(100); x2Slider.setHeight(20); x2Slider.setDefaultValue(80); SliderItem y2Slider = new SliderItem("y2"); y2Slider.setMinValue(1); y2Slider.setMaxValue(100); y2Slider.setHeight(20); y2Slider.setDefaultValue(80); linearGradientSliderDynamicForm = new DynamicForm(); linearGradientSliderDynamicForm.setWidth(270); linearGradientSliderDynamicForm.setFields(x1Slider, y1Slider, x2Slider, y2Slider); linearGradientSliderDynamicForm.addItemChangedHandler(linearGradientItemChangedHandler); linearGradientSliderDynamicForm.draw(); linearGradientShapesDraw(drawPane); VStack layout = new VStack(); HLayout layout2 = new HLayout(); layout2.addMember(drawPane); layout2.addMember(linearGradientSliderDynamicForm); layout.addMember(layout2); layout.addMember(linearGradientDynamicForm); layout.setMembersMargin(15); layout.draw(); layout.draw(); } /** * This method is called to re-render the pane that contains the shapes with * a defined gradient in them. */ private void linearGradientShapesDraw(DrawPane drawPane) { drawPane.erase(); ColorStop colorStop1 = new ColorStop(); colorStop1.setColor(linearGradientDynamicForm.getValueAsString("startColor")); colorStop1.setOffset(0.0f); ColorStop colorStop2 = new ColorStop(); colorStop2.setColor(linearGradientDynamicForm.getValueAsString("firstStop")); colorStop2.setOffset(0.33f); ColorStop colorStop3 = new ColorStop(); colorStop3.setColor(linearGradientDynamicForm.getValueAsString("secondStop")); colorStop3.setOffset(0.66f); ColorStop colorStop4 = new ColorStop(); colorStop4.setColor(linearGradientDynamicForm.getValueAsString("endColor")); colorStop4.setOffset(1.0f); LinearGradient linearGradient = new LinearGradient(); linearGradient.setX1(linearGradientSliderDynamicForm.getValue("x1") + "%"); linearGradient.setY1(linearGradientSliderDynamicForm.getValue("y1") + "%"); linearGradient.setX2(linearGradientSliderDynamicForm.getValue("x2") + "%"); linearGradient.setY2(linearGradientSliderDynamicForm.getValue("y2") + "%"); linearGradient.setColorStops(colorStop1, colorStop2, colorStop3, colorStop4); DrawTriangle drawTriangle = new DrawTriangle(); drawTriangle.setDrawPane(drawPane); drawTriangle.setFillGradient(linearGradient); drawTriangle.setPoints(new Point(100,50), new Point(150,150), new Point(50,150)); drawTriangle.draw(); DrawCurve drawCurve = new DrawCurve(); drawCurve.setDrawPane(drawPane); drawCurve.setFillGradient(linearGradient); drawCurve.setStartPoint(new Point(200,50)); drawCurve.setEndPoint(new Point(340,150)); drawCurve.setControlPoint1(new Point(270,0)); drawCurve.setControlPoint2(new Point(270,200)); drawCurve.draw(); DrawOval drawOval = new DrawOval(); drawOval.setDrawPane(drawPane); drawOval.setFillGradient(linearGradient); drawOval.setLeft(50); drawOval.setTop(200); drawOval.setWidth(100); drawOval.setHeight(150); drawOval.draw(); DrawRect drawRect = new DrawRect(); drawRect.setDrawPane(drawPane); drawRect.setFillGradient(linearGradient); drawRect.setLeft(200); drawRect.setTop(225); drawRect.setWidth(150); drawRect.setHeight(100); drawRect.draw(); } }