1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
import QtQuick 2.9
Item {
id: root
width: 300
height: 300
property real value: 0
property real minValue: 0
property real maxValue: 240
property string unit: "Km/h"
property color primaryColor: "#16CCBA"
property color secondaryColor: "#00000000"
property int animationDuration: 500
property real startAngle: Math.PI * 3 / 4
property real fullAngle: Math.PI * 3 / 2
property real gaugeRadius: 0
property real tickLength: 0
signal speedValueChanged(int value)
Component.onCompleted: {
calculateGeometry();
updateGaugeValue(value); // Initialize the gauge display
}
onWidthChanged: calculateGeometry()
onHeightChanged: calculateGeometry()
function calculateGeometry() {
const side = Math.min(width, height);
gaugeRadius = (side - side * 0.20) / 2;
tickLength = gaugeRadius * 0.1;
}
Rectangle {
anchors.fill: parent
color: "#041F2B"
z: -1
}
Image {
id: background1
source: "./assets/Ellipse 5.svg"
rotation: 180
sourceSize.width: width
sourceSize.height: width
fillMode: Image.PreserveAspectFit
anchors.fill: parent
scale: 1
opacity: 0.7
z: 0
}
Image {
id: background2
source: "./assets/Ellipse 1.svg"
sourceSize.width: width
sourceSize.height: width
fillMode: Image.PreserveAspectFit
anchors.fill: parent
scale: 1
opacity: 0.7
z: 1
}
Canvas {
id: canvas
anchors.fill: parent
antialiasing: true
onPaint: {
var ctx = getContext("2d");
var center = Qt.point(width / 2, height / 2);
ctx.reset();
ctx.lineCap = 'round';
drawBackground(ctx, center);
drawProgress(ctx, center, value);
drawTicks(ctx, center);
drawProgressTick(ctx, center, value);
}
function drawBackground(ctx, center) {
ctx.lineWidth = gaugeRadius * 0.1;
ctx.beginPath();
ctx.arc(center.x, center.y, gaugeRadius, startAngle, startAngle + fullAngle);
ctx.strokeStyle = secondaryColor;
ctx.stroke();
}
function drawProgress(ctx, center, progress) {
ctx.lineWidth = 20;
var gradient = ctx.createLinearGradient(
center.x - gaugeRadius, center.y,
center.x + gaugeRadius, center.y
);
gradient.addColorStop(0.0, "#00FF00");
//gradient.addColorStop(0.3, primaryColor);
gradient.addColorStop(0.4, "#FFD700");
gradient.addColorStop(1, "#FF0000");
ctx.beginPath();
ctx.arc(center.x, center.y, gaugeRadius, startAngle, startAngle + (progress / (maxValue - minValue)) * fullAngle);
ctx.strokeStyle = gradient;
ctx.stroke();
}
function drawTicks(ctx, center) {
ctx.lineWidth = tickLength / 2;
ctx.strokeStyle = '#FFFFFF';
ctx.beginPath();
const tickCount = 10; // Adjust the number of ticks as needed
for (let i = 0; i <= tickCount; i++) {
const angle = startAngle + (i / tickCount) * fullAngle;
const x1 = center.x + gaugeRadius * Math.cos(angle);
const y1 = center.y + gaugeRadius * Math.sin(angle);
const x2 = center.x + (gaugeRadius - tickLength) * Math.cos(angle);
const y2 = center.y + (gaugeRadius - tickLength) * Math.sin(angle);
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
}
ctx.stroke();
}
function drawProgressTick(ctx, center, progress) {
ctx.lineWidth = tickLength * 1.5;
ctx.strokeStyle = '#FFFFFF';
ctx.beginPath();
const progressAngle = startAngle + (progress / (maxValue - minValue)) * fullAngle;
const x1 = center.x + gaugeRadius * Math.cos(progressAngle);
const y1 = center.y + gaugeRadius * Math.sin(progressAngle);
const x2 = center.x + (gaugeRadius - tickLength * 1.5) * Math.cos(progressAngle);
const y2 = center.y + (gaugeRadius - tickLength * 1.5) * Math.sin(progressAngle);
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.stroke();
}
}
Text {
id: gaugeText
anchors.centerIn: parent
text: "0"
font.pixelSize: 0.3 * Math.min(root.width, root.height)
font.bold: true
color: "#FFFFFF"
}
Text {
id: gaugeUnit
anchors.top: gaugeText.bottom
anchors.horizontalCenter: gaugeText.horizontalCenter
text: unit
font.pixelSize: 18
font.bold: true
color: "#FFFFFF"
}
Behavior on value {
NumberAnimation { duration: animationDuration }
}
onValueChanged: updateGaugeValue(value)
function updateGaugeValue(value) {
canvas.requestPaint(); // Request a repaint to reflect changes.
gaugeText.text = (value).toFixed(0); // Display the current value directly.
speedValueChanged(value); // Emit the signal with the current value.
}
MouseArea {
id: dragArea
anchors.fill: parent
property bool isDragging: false
onEntered: cursorShape = Qt.PointingHandCursor
onPressed: {
isDragging = true;
updateDragValue(mouseX, mouseY); // Update immediately on press.
}
onReleased: isDragging = false
onPositionChanged:
if (isDragging) {
updateDragValue(mouseX, mouseY); // Use formal parameters instead of injected ones.
}
function updateDragValue(x, y) {
const centerX = width / 2;
const centerY = height / 2;
// Calculate angle from the center to the mouse position.
const dx = x - centerX;
const dy = centerY - y; // Note that y-axis is inverted in QML.
const angle = Math.atan2(dy, dx);
// Normalize angle to [startAngle .. startAngle + fullAngle]
let normalizedAngle = angle < startAngle ? angle + Math.PI * 2 : angle;
// Calculate the normalized value based on the angle.
let normalizedValue = ((normalizedAngle - startAngle) / fullAngle) * (maxValue - minValue);
// Clamp value within min and max range.
normalizedValue = Math.max(minValue, Math.min(maxValue, normalizedValue));
// Update the root value.
root.value = normalizedValue;
}
}
}
|
